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Zhang Y, Wang H, Ni C, Wang Q, Lin T. Three-dimensional nanoporous gold/gold nanoparticles substrate for surface-enhanced Raman scattering detection of illegal additives in food. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2024; 323:124879. [PMID: 39067360 DOI: 10.1016/j.saa.2024.124879] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2024] [Revised: 07/02/2024] [Accepted: 07/22/2024] [Indexed: 07/30/2024]
Abstract
Owing to their nanoscale size and porous structure, both colloidal gold nanoparticles (AuNPs) and nanoporous gold (NPG) have demonstrated good and stable surface-enhanced Raman scattering (SERS) activity, and are therefore widely used as SERS substrates for the rapid detection of various components in food, environmental, biological, and other samples. In this study, we fabricated a novel, sensitive, and reproducible composite three-dimensional (3D) substrate for rapid SERS-based detection of illegal additives in food products. AuNPs and NPGs were prepared by chemical reduction and chemical dealloying methods, with the particle size of AuNPs about 60 nm and the pore size of NPG in the range of 5-36 nm. The AuNPs were then assembled on the surface of NPG to form the composite substrate 3D-NPG/AuNPs, which was characterized by transmission electron microscopy, scanning electron microscopy, X-ray diffraction, and other methods. Finally, the new SERS substrate combined with a portable Raman spectrometer was used to detect the illegal food additives 6-benzylaminopurine and melamine, with detection limits of 1 × 10-9 M and 5 × 10-7 M respectively. We further analyzed the relationship between the dealloying time-controlled morphology and the SERS properties of NPG, demonstrating that 3D-NPG/AuNPs as a novel SERS substrate have strong practical application potential in the rapid detection of food additives and other substances.
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Affiliation(s)
- Yumiao Zhang
- College of Chemistry and Life Science, Beijing University of Technology, Beijing 100124, PR China.
| | - Huiqin Wang
- College of Chemistry and Life Science, Beijing University of Technology, Beijing 100124, PR China.
| | - Chengliang Ni
- Beijing Baonuokang Pharmaceutical Technology Co., Ltd., Beijing 102600, PR China.
| | - Qihui Wang
- Environmental Monitoring Centre, Sinochem Environment Holdings Co., Ltd., Beijing 100045, PR China.
| | - Taifeng Lin
- College of Chemistry and Life Science, Beijing University of Technology, Beijing 100124, PR China.
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2
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Ramachandran T, Ali A, Butt H, Zheng L, Deader FA, Rezeq M. Gold on the horizon: unveiling the chemistry, applications and future prospects of 2D monolayers of gold nanoparticles (Au-NPs). NANOSCALE ADVANCES 2024; 6:d4na00666f. [PMID: 39450415 PMCID: PMC11495494 DOI: 10.1039/d4na00666f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2024] [Accepted: 09/30/2024] [Indexed: 10/26/2024]
Abstract
Noble 2D monolayers of gold nanoparticles (Au-NPs) have garnered significant attention due to their unique physicochemical properties, which are instrumental in various technological applications. This review delves into the intricate physical chemistry underlying the formation of Au-NP monolayers, highlighting key interactions such as electrostatic forces, van der Waals attractions, and ligand-mediated stabilization. The discussion extends to the size- and shape-dependent assembly processes of these NP monolayers, elucidating how nanoparticle dimensions and morphologies influence monolayer formation and stability. Moreover, the review explores the diverse interfaces-solid, liquid, and air-where Au-NP monolayers are employed, each presenting distinct advantages and challenges. In the realm of applications, Au-NP monolayers have shown remarkable promises. In memory devices, their ability to facilitate high-density data storage through enhanced electron transport mechanisms is examined. Biosensing applications benefit from the monolayers' exceptional sensitivity and specificity, which are crucial for detecting biomolecular interactions. Furthermore, the role of Au-NP monolayers in electrocatalysis is explored, with a focus on their catalytic efficiency and stability in various electrochemical reactions. Despite their potential, the deployment of Au-NP monolayers faces several challenges. The review addresses current limitations such as scalability, reproducibility, and long-term stability, proposing potential strategies to overcome these hurdles. Future prospects are also discussed, including the development of multifunctional monolayers and integration with other nanomaterials to enhance performance across different applications. In conclusion, while significant strides have been made in understanding and utilizing 2D Au-NP monolayers, ongoing research is imperative to fully exploit their capabilities. Addressing existing challenges through innovative approaches will pave the way for their widespread adoption in advanced technological applications.
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Affiliation(s)
- Tholkappiyan Ramachandran
- Department of Physics, Khalifa University of Science and Technology Abu Dhabi P. O. Box 127788 United Arab Emirates
| | - Ashraf Ali
- Department of Physics, Khalifa University of Science and Technology Abu Dhabi P. O. Box 127788 United Arab Emirates
| | - Haider Butt
- Department of Mechanical & Nuclear Engineering, Khalifa University of Science and Technology Abu Dhabi P. O. Box 127788 United Arab Emirates
| | - Lianxi Zheng
- Department of Mechanical & Nuclear Engineering, Khalifa University of Science and Technology Abu Dhabi P. O. Box 127788 United Arab Emirates
| | - Firdous Ahmad Deader
- Department of Physics, Khalifa University of Science and Technology Abu Dhabi P. O. Box 127788 United Arab Emirates
| | - Moh'd Rezeq
- Department of Physics, Khalifa University of Science and Technology Abu Dhabi P. O. Box 127788 United Arab Emirates
- System on Chip Lab (SoCL), Khalifa University of Science and Technology Abu Dhabi P. O. Box 127788 United Arab Emirates
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3
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Li X, Zhao J, Xiao H, Zhang H, Zhou M, Zhang X, Yan X, Tang A, Chen L. Multiparticle Synergistic Electrophoretic Deposition Strategy for High-Efficiency and High-Resolution Displays. ACS NANO 2024; 18:17715-17724. [PMID: 38916440 DOI: 10.1021/acsnano.4c03005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/26/2024]
Abstract
Colloidal nanoparticles offer unique photoelectric properties, making them promising for functional applications. Multiparticle systems exhibit synergistic effects on the functional properties of their individual components. However, precisely controlled assembly of multiparticles to form patterned building blocks for solid-state devices remains challenging. Here, we demonstrate a versatile multiparticle synergistic electrophoretic deposition (EPD) strategy to achieve controlled assembly, high-efficiency, and high-resolution patterns. Through elaborate surface design and charge regulation of nanoparticles, we achieve precise control over the particle distribution (gradient or homogeneous structure) in multiparticle films using the EPD technique. The multiparticle system integrates silicon oxide and titanium oxide nanoparticles, synergistically enhancing the emission efficiency of quantum dots to a high level in the field. Furthermore, we demonstrate the superiority of our strategy to integrate multiparticle into large-area full-color display panels with a high resolution over 1000 pixels per inch. The results suggest great potential for developing multiparticle systems and expanding diverse functional applications.
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Affiliation(s)
- Xuefei Li
- Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd., Shenzhen 518107, China
| | - Jinyang Zhao
- Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd., Shenzhen 518107, China
| | - Hui Xiao
- Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd., Shenzhen 518107, China
| | - Hangchuan Zhang
- Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd., Shenzhen 518107, China
| | - Miao Zhou
- Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd., Shenzhen 518107, China
| | - Xin Zhang
- Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd., Shenzhen 518107, China
| | - Xiaolin Yan
- Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd., Shenzhen 518107, China
| | - Aiwei Tang
- Key Laboratory of Luminescence and Optical Information, Ministry of Education, School of Physical Science and Engineering, Beijing Jiaotong University, Beijing 100044, China
| | - Lixuan Chen
- Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd., Shenzhen 518107, China
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4
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Duy Vu T, Thang Nguyen D, Yen Thi Nguyen H, Hoang Do H, Duc Pham T, Thanh Le S, Ngoc Vu L. A facile paper-based chromatography coupled Au nanodendrite on nickel foam for application in separation and SERS measurement. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2024; 313:124137. [PMID: 38479225 DOI: 10.1016/j.saa.2024.124137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2023] [Revised: 02/28/2024] [Accepted: 03/06/2024] [Indexed: 04/02/2024]
Abstract
A simple paper-based chromatography coupling with nickel foam decorated Au nanodendrite (PP-AuND/NiF) was fabricated for simultaneous separation and surface-enhanced Raman scattering (SERS) detection of Rhodamine-6G (R6G) from a mixture of analytes. The three-dimensional porous nickel foam (NiF) was employed as a sampling diffusion platform, and AuND with a high surface active area beneficial for SERS efficiency was electro-deposited directly onto the NiF frame. The structure of AuND/NiF was characterized by X-ray diffraction and scanning electron microscopy. The AuND/NiF could detect R6G at 0.1 nM, and the enhancement factor was 1.84 x 106. The AuND/NiF was durable, with a slight signal decrease after 6 m of drop-testing. Also, upon three days of exposure to ambient air, the signal droped only 3.35 %. Subsequently, the PP-AuND/NiF was constructed by directly situating AuND/NiF on a paper strip, serving as a sample in and out to AuND/NiF. A mixture of two SERS active compounds, namely 2-Naphthalenethiol (2-NpSH) and Rhodamine 6G (R6G), was prepared in ethanol: water (1:1) solution to evaluate PP-AuND/NiF separation capability. Raman measurements along different distances of AuND/NiF were performed, and the signal of 2-NpSH was dismissed after 3.0 mm, while R6G's signals were observed throughout AuND/NiF. In general, the PP-AuND/NiF demonstrated effective separation and SERS measurement of analytes in a mixture, which could be applicable for more complex samples in the future, especially in clinical analysis.
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Affiliation(s)
- Tung Duy Vu
- Faculty of Chemistry, University of Science, Vietnam National University, Hanoi, Vietnam.
| | - Duc Thang Nguyen
- Faculty of Chemistry, University of Science, Vietnam National University, Hanoi, Vietnam
| | - Hai Yen Thi Nguyen
- Faculty of Chemistry, University of Science, Vietnam National University, Hanoi, Vietnam
| | - Huy Hoang Do
- Faculty of Chemistry, University of Science, Vietnam National University, Hanoi, Vietnam
| | - Tien Duc Pham
- Faculty of Chemistry, University of Science, Vietnam National University, Hanoi, Vietnam
| | - Son Thanh Le
- Faculty of Chemistry, University of Science, Vietnam National University, Hanoi, Vietnam
| | - Linh Ngoc Vu
- Faculty of Engineering Physics and Nanotechnology, University of Engineering and Technology, Vietnam National University, Hanoi, Vietnam
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5
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Jiang L, Mao X, Liu C, Guo X, Deng R, Zhu J. 2D superlattices via interfacial self-assembly of polymer-grafted Au nanoparticles. Chem Commun (Camb) 2023; 59:14223-14235. [PMID: 37962523 DOI: 10.1039/d3cc04587k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2023]
Abstract
Nanoparticle (NP) superlattices are periodic arrays of nanoscale building blocks. Because of the collective effect between functional NPs, NP superlattices can exhibit exciting new properties that are distinct from those of individual NPs or corresponding bulk materials. In particular, two-dimensional (2D) NP superlattices have attracted increasing attention due to their emerging applications in micro/opto-electronics, catalysis, sensing, and other fields. Among various preparation methods, evaporation-induced interfacial self-assembly has become the most popular method for preparing 2D NP superlattices because it is a simple, low-cost, and scalable process that can be widely applied to various NPs. Introducing soft ligands, such as polymers, can not only provide convenience in controlling the self-assembly process and tuning superlattice structures but also improve the properties of 2D NP superlattices. This feature article focuses on the methods of evaporation-induced self-assembly of polymer-grafted Au NPs into free-standing 2D NP superlattice films at air/liquid interfaces and 2D NP superlattice coatings on substrates, followed by studies on in situ tracking of the self-assembly evolution process through small-angle X-ray scattering. Their application in nano-floating gate memory devices is also included. Finally, the challenges and perspectives of this direction are discussed.
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Affiliation(s)
- Liangzhu Jiang
- Key Laboratory of Materials Chemistry for Energy Conversion and Storage of the Ministry of Education School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
| | - Xi Mao
- Key Laboratory of Materials Chemistry for Energy Conversion and Storage of the Ministry of Education School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
| | - Changxu Liu
- Key Laboratory of Materials Chemistry for Energy Conversion and Storage of the Ministry of Education School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
| | - Xiaodan Guo
- Key Laboratory of Materials Chemistry for Energy Conversion and Storage of the Ministry of Education School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
| | - Renhua Deng
- Key Laboratory of Materials Chemistry for Energy Conversion and Storage of the Ministry of Education School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
| | - Jintao Zhu
- Key Laboratory of Materials Chemistry for Energy Conversion and Storage of the Ministry of Education School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
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6
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Zeng P, Zhou Y, Shu Z, Liang H, Zhang X, Chen Y, Duan H, Zheng M. Suspended 3D metallic dimers with sub-10 nm gap for high-sensitive SERS detection. NANOTECHNOLOGY 2022; 34:095301. [PMID: 36384034 DOI: 10.1088/1361-6528/aca338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2022] [Accepted: 11/14/2022] [Indexed: 06/16/2023]
Abstract
The suspended metallic nanostructures with tiny gaps have certain advantages in surface-enhanced Raman scattering (SERS) due to the coaction of the tiny metallic nanogaps and the substrate-decoupled electromagnetism resonant modes. In this study, we used the lithographic HSQ/PMMA electron-beam bilayer resist exposure combined with a deposition-induced nanogap-narrowing process to define elevated suspended metallic nanodimers with tiny gaps for surface-enhanced Raman spectroscopy detection. By adjusting the deposited metal thickness, the metallic dimers with sub-10 nm gaps can be reliably obtained. These dimers with tunable nanogaps successfully served as excellent SERS substrates, exhibiting remarkable high-sensitivity detection ability for crystal violet molecules. Systematic experiments and simulations were conducted to explain the origin of the improved SERS performance. The results showed that the 3D elevated suspended metallic dimers could achieve a higher SERS enhancement factor than the metallic dimers on HSQ pillars and a common Si substrate, demonstrating that this kind of suspended metallic dimer is a promising route for high-sensitive SERS detection and other plasmonic applications.
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Affiliation(s)
- Pei Zeng
- Jihua Laboratory, Foshan 528000, People's Republic of China
- College of Mechanical and Vehicle Engineering, National Engineering Research Centre for High Efficiency Grinding, Hunan University, Changsha 410082, People's Republic of China
| | - Yuting Zhou
- College of Mechanical and Vehicle Engineering, National Engineering Research Centre for High Efficiency Grinding, Hunan University, Changsha 410082, People's Republic of China
| | - Zhiwen Shu
- College of Mechanical and Vehicle Engineering, National Engineering Research Centre for High Efficiency Grinding, Hunan University, Changsha 410082, People's Republic of China
| | - Huikang Liang
- College of Mechanical and Vehicle Engineering, National Engineering Research Centre for High Efficiency Grinding, Hunan University, Changsha 410082, People's Republic of China
| | - Xiaoqing Zhang
- College of Mechanical and Vehicle Engineering, National Engineering Research Centre for High Efficiency Grinding, Hunan University, Changsha 410082, People's Republic of China
| | - Yiqin Chen
- College of Mechanical and Vehicle Engineering, National Engineering Research Centre for High Efficiency Grinding, Hunan University, Changsha 410082, People's Republic of China
| | - Huigao Duan
- College of Mechanical and Vehicle Engineering, National Engineering Research Centre for High Efficiency Grinding, Hunan University, Changsha 410082, People's Republic of China
| | - Mengjie Zheng
- Jihua Laboratory, Foshan 528000, People's Republic of China
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7
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Chai Z, Childress A, Busnaina AA. Directed Assembly of Nanomaterials for Making Nanoscale Devices and Structures: Mechanisms and Applications. ACS NANO 2022; 16:17641-17686. [PMID: 36269234 PMCID: PMC9706815 DOI: 10.1021/acsnano.2c07910] [Citation(s) in RCA: 50] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Accepted: 10/06/2022] [Indexed: 05/19/2023]
Abstract
Nanofabrication has been utilized to manufacture one-, two-, and three-dimensional functional nanostructures for applications such as electronics, sensors, and photonic devices. Although conventional silicon-based nanofabrication (top-down approach) has developed into a technique with extremely high precision and integration density, nanofabrication based on directed assembly (bottom-up approach) is attracting more interest recently owing to its low cost and the advantages of additive manufacturing. Directed assembly is a process that utilizes external fields to directly interact with nanoelements (nanoparticles, 2D nanomaterials, nanotubes, nanowires, etc.) and drive the nanoelements to site-selectively assemble in patterned areas on substrates to form functional structures. Directed assembly processes can be divided into four different categories depending on the external fields: electric field-directed assembly, fluidic flow-directed assembly, magnetic field-directed assembly, and optical field-directed assembly. In this review, we summarize recent progress utilizing these four processes and address how these directed assembly processes harness the external fields, the underlying mechanism of how the external fields interact with the nanoelements, and the advantages and drawbacks of utilizing each method. Finally, we discuss applications made using directed assembly and provide a perspective on the future developments and challenges.
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Affiliation(s)
- Zhimin Chai
- State
Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing100084, China
- NSF
Nanoscale Science and Engineering Center for High-Rate Nanomanufacturing
(CHN), Northeastern University, Boston, Massachusetts02115, United States
| | - Anthony Childress
- NSF
Nanoscale Science and Engineering Center for High-Rate Nanomanufacturing
(CHN), Northeastern University, Boston, Massachusetts02115, United States
| | - Ahmed A. Busnaina
- NSF
Nanoscale Science and Engineering Center for High-Rate Nanomanufacturing
(CHN), Northeastern University, Boston, Massachusetts02115, United States
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8
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Pillanagrovi J, Dutta-Gupta S. Controlled assembly of gold nanoparticles in resonant gold nanoapertures for SERS applications. NANOTECHNOLOGY 2022; 33:485301. [PMID: 36001942 DOI: 10.1088/1361-6528/ac8c49] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Accepted: 08/24/2022] [Indexed: 06/15/2023]
Abstract
The controlled assembly of plasmonic nanoparticles is vital for realizing low-cost, high efficiency plasmonic substrates with tunable resonances. Here, we present a strategy to assemble gold nanoparticles (AuNPs) in resonant gold nanoapertures (NAs) to enable coupling-mediated near-field enhancement. The NAs templates are fabricated using shadow sphere lithography on polyelectrolyte (PE) coated substrates. Subsequently, AuNPs are assembled in the resonant NA templates via a simple immersion step. The PE layer, AuNP concentration, NaCl concentration, incubation time, and template thickness are used to control the particle number per aperture and the interparticle distance of the AuNP assemblies. The fabricated AuNP-NA substrates are evaluated for their SERS potential using 4-Mercaptobenzoic acid (MBA) as a Raman reporter molecule. The SERS intensity of the AuNP-NA templates can be enhanced by ten times by controlling the AuNP and NA template parameters as compared to the bare NA templates. Numerical simulations show that the coupling between the various plasmonic modes is crucial for this SERS enhancement. The proposed strategy can be used to fabricate hybrid AuNP-NA based SERS substrates with improved sensitivity.
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Affiliation(s)
- Jayakumar Pillanagrovi
- Materials Science and Metallurgical Engineering, Indian Institute of Technology Hyderabad, Hyderabad, India
| | - Shourya Dutta-Gupta
- Materials Science and Metallurgical Engineering, Indian Institute of Technology Hyderabad, Hyderabad, India
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9
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Roach L, Hereu A, Lalanne P, Duguet E, Tréguer-Delapierre M, Vynck K, Drisko GL. Controlling disorder in self-assembled colloidal monolayers via evaporative processes. NANOSCALE 2022; 14:3324-3345. [PMID: 35174843 PMCID: PMC8900142 DOI: 10.1039/d1nr07814c] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Accepted: 01/12/2022] [Indexed: 04/14/2023]
Abstract
Monolayers of assembled nano-objects with a controlled degree of disorder hold interest in many optical applications, including photovoltaics, light emission, sensing, and structural coloration. Controlled disorder can be achieved through either top-down or bottom-up approaches, but the latter is more suited to large-scale, low-cost fabrication. Disordered colloidal monolayers can be assembled through evaporatively driven convective assembly, a bottom-up process with a wide range of parameters impacting particle placement. Motivated by the photonic applications of such monolayers, in this review we discuss the quantification of monolayer disorder, and the assembly methods that have been used to produce them. We review the impact of particle and solvent properties, as well as the use of substrate patterning, to create the desired spatial distributions of particles.
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Affiliation(s)
- Lucien Roach
- CNRS, Univ. Bordeaux, Bordeaux INP, ICMCB, UMR 5026, F-33600 Pessac, France.
| | - Adrian Hereu
- CNRS, Univ. Bordeaux, Bordeaux INP, ICMCB, UMR 5026, F-33600 Pessac, France.
| | - Philippe Lalanne
- IOGS, Univ. Bordeaux, CNRS, LP2N, UMR 5298, F-33400 Talence, France
| | - Etienne Duguet
- CNRS, Univ. Bordeaux, Bordeaux INP, ICMCB, UMR 5026, F-33600 Pessac, France.
| | | | - Kevin Vynck
- Univ. Claude Bernard Lyon 1, CNRS, iLM, UMR 5306, F-69622 Villeurbanne, France.
| | - Glenna L Drisko
- CNRS, Univ. Bordeaux, Bordeaux INP, ICMCB, UMR 5026, F-33600 Pessac, France.
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10
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Gothe PK, Martinez A, Koh SJ. Effect of Ionic Strength, Nanoparticle Surface Charge Density, and Template Diameter on Self-Limiting Single-Particle Placement: A Numerical Study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:11961-11977. [PMID: 34610743 DOI: 10.1021/acs.langmuir.1c01375] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
For the bottom-up approach where functional materials are constructed out of nanoscale building blocks (e.g., nanoparticles), it is essential to have methods that are capable of placing the individual nanoscale building blocks onto exact substrate positions on a large scale and on a large area. One of the promising placement methods is the self-limiting single-particle placement (SPP), in which a single nanoparticle in a colloidal solution is electrostatically guided by electrostatic templates and exactly one single nanoparticle is placed on each target position in a self-limiting way. This paper presents a numerical study on SPP, where the effects of three key parameters, (1) ionic strength (IS), (2) nanoparticle surface charge density (σNP), and (3) circular template diameter (d), on SPP are investigated. For 40 different parameter sets of (IS, σNP, d), a 30 nm nanoparticle positioned at R⃗ above the substrate was modeled in two configurations (i) without and (ii) with the presence of a 30 nm nanoparticle at the center of a circular template. For each parameter set and each configuration, the electrostatic potentials were calculated by numerically solving the Poisson-Boltzmann equation, from which interaction forces and interaction free energies were subsequently calculated. These have identified realms of parameter sets that enable a successful SPP. A few exemplary parameter sets include (IS, σNP, d) = (0.5 mM, -1.5 μC/cm2, 100 nm), (0.05 mM, -0.5 μC/cm2, 100 nm), (0.5 mM, -1.5 μC/cm2, 150 nm), and (0.05 mM, -0.8 μC/cm2, 150 nm). This study provides clear guidance toward experimental realizations of large-scale and large-area SPPs, which could lead to bottom-up fabrications of novel electronic, photonic, plasmonic, and spintronic devices and sensors.
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Affiliation(s)
- Pushkar K Gothe
- Department of Materials Science and Engineering, University of Texas at Arlington, Arlington, Texas 76019, United States
| | - Anthony Martinez
- Department of Materials Science and Engineering, University of Texas at Arlington, Arlington, Texas 76019, United States
| | - Seong Jin Koh
- Department of Materials Science and Engineering, University of Texas at Arlington, Arlington, Texas 76019, United States
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11
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Chang B, Zhao D. Direct assembly of nanowires by electron beam-induced dielectrophoresis. NANOTECHNOLOGY 2021; 32:415602. [PMID: 33721856 DOI: 10.1088/1361-6528/abeeb5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Accepted: 03/15/2021] [Indexed: 06/12/2023]
Abstract
Controllable self-assembly is an important tool to investigate interactions between nanoscale objects. Here we present an assembly strategy based on 3D aligned silicon nanowires. By illuminating the tips of nanowires locally by a focused electron beam, an attractive dielectrophoretic force can be induced, leading to elastic deformations and sticking between adjacent nanowires. The whole process is performed feasibly inside a vacuum environment free from capillary or hydrodynamic forces. Assembly mechanisms are discussed for nanowires in both one and two layers, and various ordered organizations are presented. With the help of moisture treatment, a hierarchical assembly can also be achieved. Notably, an unsynchronized assembly is observed in two layers of nanowires. This study helps with a better understanding of nanoscale sticking phenomena and electrostatic actuations in nanoelectromechanical systems, besides, it also provides possibilities to probe quantum effects like Casimir forces and phonon heat transport in a vacuum gap.
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Affiliation(s)
- Bingdong Chang
- DTU Nanolab, Technical University of Denmark, Ørsteds Plads, Building 347, DK-2800 Kgs. Lyngby, Denmark
| | - Ding Zhao
- Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province, School of Engineering, Westlake University, Hangzhou 310024, People's Republic of China
- Institute of Advanced Technology, Westlake Institute for Advanced Study, Hangzhou 310024, People's Republic of China
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12
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Zeng P, Shu Z, Zhang S, Liang H, Zhou Y, Ba D, Feng Z, Zheng M, Wu J, Chen Y, Duan H. Fabrication of single-nanometer metallic gaps via spontaneous nanoscale dewetting. NANOTECHNOLOGY 2021; 32:205302. [PMID: 33571970 DOI: 10.1088/1361-6528/abe576] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Ultrasmall metallic nanogaps are of great significance for wide applications in various nanodevices. However, it is challenging to fabricate ultrasmall metallic nanogaps by using common lithographic methods due to the limited resolution. In this work, we establish an effective approach for successful formation of ultrasmall metallic nanogaps based on the spontaneous nanoscale dewetting effect during metal deposition. By varying the initial opening size of the exposed resist template, the influence of dewetting behavior could be adjusted and tiny metallic nanogaps can be obtained. We demonstrate that this method is effective to fabricate diverse sub-10 nm gaps in silver nanostructures. Based on this fabrication concept, even sub-5 nm metallic gaps were obtained. SERS measurements were performed to show the molecular detection capability of the fabricated Ag nanogaps. This approach is a promising candidate for sub-10 nm metallic gaps fabrication, thus possessing potential applications in nanoelectronics, nanoplasmonics, and nano-optoelectronics.
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Affiliation(s)
- Pei Zeng
- College of Mechanical and Vehicle Engineering, National Engineering Research Centre for High Efficiency Grinding, Hunan University, Changsha 410082, People's Republic of China
| | - Zhiwen Shu
- College of Mechanical and Vehicle Engineering, National Engineering Research Centre for High Efficiency Grinding, Hunan University, Changsha 410082, People's Republic of China
| | - Shi Zhang
- College of Mechanical and Vehicle Engineering, National Engineering Research Centre for High Efficiency Grinding, Hunan University, Changsha 410082, People's Republic of China
| | - Huikang Liang
- College of Mechanical and Vehicle Engineering, National Engineering Research Centre for High Efficiency Grinding, Hunan University, Changsha 410082, People's Republic of China
| | - Yuting Zhou
- College of Mechanical and Vehicle Engineering, National Engineering Research Centre for High Efficiency Grinding, Hunan University, Changsha 410082, People's Republic of China
| | - Dedong Ba
- Science and Technology on Vacuum Technology and Physics Laboratory, Lanzhou Institute of Physics, Lanzhou 730000, People's Republic of China
| | - Zhanzu Feng
- Science and Technology on Material Performance Evaluating in Space Environment Laboratory, Lanzhou Institute of Physics, Lanzhou 730000, People's Republic of China
| | - Mengjie Zheng
- Jihua Laboratory, Foshan 528000, People's Republic of China
| | - Jianhui Wu
- College of Mechanical and Vehicle Engineering, National Engineering Research Centre for High Efficiency Grinding, Hunan University, Changsha 410082, People's Republic of China
| | - Yiqin Chen
- College of Mechanical and Vehicle Engineering, National Engineering Research Centre for High Efficiency Grinding, Hunan University, Changsha 410082, People's Republic of China
| | - Huigao Duan
- College of Mechanical and Vehicle Engineering, National Engineering Research Centre for High Efficiency Grinding, Hunan University, Changsha 410082, People's Republic of China
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Shi CF, Li ZQ, Wang C, Li J, Xia XH. Ultrasensitive plasmon enhanced Raman scattering detection of nucleolin using nanochannels of 3D hybrid plasmonic metamaterial. Biosens Bioelectron 2021; 178:113040. [PMID: 33548655 DOI: 10.1016/j.bios.2021.113040] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Revised: 01/07/2021] [Accepted: 01/23/2021] [Indexed: 10/22/2022]
Abstract
Detection of cancer biomarker is of great significance in cancer diagnostics. In this work, we propose an ultrasensitive and in situ method for plasmon enhanced Raman scattering (PERS) detection of nucleolin (NCL) using a 3D hybrid plasmonic metamaterial (PM). In this aptasensor, thiolated complementary DNA (cDNA) immobilized on PM can hybridize with Rox-labeled NCL-binding aptamer (AS1411-Rox) to form a rigid double-stranded DNA (dsDNA). When NCL passes through the PM nanochannels under a transmembrane voltage bias, it interacts with AS1411-Rox to form G-quadruplexes (G4-AS1411-Rox), resulting in the release of AS1411-Rox from the nanochannels surface and the decrease in PERS signal of the reporter Rox. This change in PERS signals can be recorded in situ without the interference of external environment. With the help of the enrichment function of nanochannel, the present method is able to achieve fast NCL detection within 10 min with a detection limit as low as 71 pM. Furthermore, our method shows excellent specificity, reversibility, uniformity (relative standard deviation of ~6.86%) and reproducibility (~6.65%), providing a new platform for reliable cancer auxiliary diagnosis and drug screening.
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Affiliation(s)
- Cai-Feng Shi
- State Key Lab of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, 210023, Nanjing, China
| | - Zhong-Qiu Li
- State Key Lab of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, 210023, Nanjing, China
| | - Chen Wang
- State Key Lab of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, 210023, Nanjing, China
| | - Jian Li
- State Key Lab of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, 210023, Nanjing, China.
| | - Xing-Hua Xia
- State Key Lab of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, 210023, Nanjing, China.
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14
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Pioli R, Fernandez-Rodriguez MA, Grillo F, Alvarez L, Stocker R, Isa L, Secchi E. Sequential capillarity-assisted particle assembly in a microfluidic channel. LAB ON A CHIP 2021; 21:888-895. [PMID: 33427254 DOI: 10.1039/d0lc00962h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Colloidal patterning enables the placement of a wide range of materials into prescribed spatial arrangements, as required in a variety of applications, including micro- and nano-electronics, sensing, and plasmonics. Directed colloidal assembly methods, which exploit external forces to place particles with high yield and great accuracy, are particularly powerful. However, currently available techniques require specialized equipment, which limits their applicability. Here, we present a microfluidic platform to produce versatile colloidal patterns within a microchannel, based on sequential capillarity-assisted particle assembly (sCAPA). This new microfluidic technology exploits the capillary forces resulting from the controlled motion of an evaporating droplet inside a microfluidic channel to deposit individual particles in an array of traps microfabricated onto a substrate. Sequential depositions allow the generation of a desired spatial layout of colloidal particles of single or multiple types, dictated solely by the geometry of the traps and the filling sequence. We show that the platform can be used to create a variety of patterns and that the microfluidic channel easily allows surface functionalization of trapped particles. By enabling colloidal patterning to be carried out in a controlled environment, exploiting equipment routinely used in microfluidics, we demonstrate an easy-to-build platform that can be implemented in microfluidics labs.
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Affiliation(s)
- Roberto Pioli
- Institute of Environmental Engineering, Department of Civil, Environmental and Geomatic Engineering, ETH Zürich, Stefano-Franscini-Platz 5, 8093 Zürich, Switzerland.
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15
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Choi M, Kang T, Choi SH, Byun KM. Dual modal plasmonic substrates based on a convective self-assembly technique for enhancement in SERS and LSPR detection. OPTICS EXPRESS 2021; 29:6179-6187. [PMID: 33726144 DOI: 10.1364/oe.419051] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Accepted: 02/07/2021] [Indexed: 06/12/2023]
Abstract
In this study, surface-enhanced Raman scattering (SERS) scheme is combined with localized surface plasmon resonance (LSPR) detection on a thin gold film with stripe patterns of gold nanoparticles (GNPs) via convective self-assembly (CSA) method. The potential of dual modal plasmonic substrates was evaluated by binding 4-ABT and IgG analytes, respectively. SERS experiments presented not only a high sensitivity with a detection limit of 4.7 nM and an enhancement factor of 1.34 × 105, but an excellent reproducibility with relative standard deviation of 5.5%. It was found from plasmonic sensing experiments by immobilizing IgG onto GNP-mediated gold film that detection sensitivity was improved by more than 211%, compared with a conventional bare gold film. Our synergistic SERS-LSPR approach based on a simple and cost-effective CSA method could open a route for sensitive, reliable and reproducible dual modal detection to expand the application areas.
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16
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Chai Z, Korkmaz A, Yilmaz C, Busnaina AA. High-Rate Printing of Micro/Nanoscale Patterns Using Interfacial Convective Assembly. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e2000747. [PMID: 32323404 DOI: 10.1002/adma.202000747] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2020] [Revised: 03/17/2020] [Accepted: 03/18/2020] [Indexed: 06/11/2023]
Abstract
Printing of electronics has been receiving increasing attention from academia and industry over the recent years. However, commonly used printing techniques have limited resolution of micro- or sub-microscale. Here, a directed-assembly-based printing technique, interfacial convective assembly, is reported, which utilizes a substrate-heating-induced solutal Marangoni convective flow to drive particles toward patterned substrates and then uses van der Waals interactions as well as geometrical confinement to trap the particles in the pattern areas. The influence of various assembly parameters including type of mixing solvent, substrate temperature, particle concentration, and assembly time is investigated. The results show successful assembly of various nanoparticles in patterns of different shapes with a high resolution down to 25 nm. In addition, the assembly only takes a few minutes, which is two orders of magnitude faster than conventional convective assembly. Small-sized (diameter below 5 nm) nanoparticles tend to coalesce during the assembly process and form sintered structures. The fabricated silver nanorods show single-crystal structure with a low resistivity of 8.58 × 10-5 Ω cm. With high versatility, high resolution, and high throughput, the interfacial convective assembly opens remarkable opportunities for printing next generation nanoelectronics and sensors.
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Affiliation(s)
- Zhimin Chai
- NSF Nanoscale Science and Engineering Center for High-Rate Nanomanufacturing (CHN), Northeastern University, Boston, MA, 02115, USA
| | - Adnan Korkmaz
- NSF Nanoscale Science and Engineering Center for High-Rate Nanomanufacturing (CHN), Northeastern University, Boston, MA, 02115, USA
| | - Cihan Yilmaz
- NSF Nanoscale Science and Engineering Center for High-Rate Nanomanufacturing (CHN), Northeastern University, Boston, MA, 02115, USA
| | - Ahmed A Busnaina
- NSF Nanoscale Science and Engineering Center for High-Rate Nanomanufacturing (CHN), Northeastern University, Boston, MA, 02115, USA
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17
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Song L, Huang Y, Nie Z, Chen T. Macroscopic two-dimensional monolayer films of gold nanoparticles: fabrication strategies, surface engineering and functional applications. NANOSCALE 2020; 12:7433-7460. [PMID: 32219290 DOI: 10.1039/c9nr09420b] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
In the last few decades, two-dimensional monolayer films of gold nanoparticles (2D MFGS) have attracted increasing attention in various fields, due to their superior attributes of macroscopic size and accessible fabrication, controllable electromagnetic enhancement, distinctive optical harvesting and electron transport capabilities. This review will focus on the recent progress of 2D monolayer films of gold nanoparticles in construction approaches, surface engineering strategies and functional applications in the optical and electric fields. The research challenges and prospective directions of 2D MFGS are also discussed. This review would promote a better understanding of 2D MFGS and establish a necessary bridge among the multidisciplinary research fields.
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Affiliation(s)
- Liping Song
- Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China.
| | - Youju Huang
- Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China. and College of Materials, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou, Zhejiang 311121, China and National Engineering Research Centre for Advanced Polymer Processing Technology, Key Laboratory of Materials Processing and Mold (Zhengzhou University), Ministry of Education, Zhengzhou University, Zhengzhou 450002, P. R. China
| | - Zhihong Nie
- State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai, 200438, P. R. China.
| | - Tao Chen
- Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China.
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18
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Yuan N, Zhao H, Zheng C, Zheng X, Fu Q, Wu M, Lei Y. An efficient nanopatterning strategy for controllably fabricating ultra-small gaps as a highly sensitive surface-enhanced Raman scattering platform. NANOTECHNOLOGY 2020; 31:045301. [PMID: 31574491 DOI: 10.1088/1361-6528/ab49ac] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The realization of large-scale and high-density gaps with sizes as small as possible is crucial for designing ultra-sensitive surface-enhanced Raman scattering (SERS) substrates. As known, the ultrathin alumina mask (UTAM) surface nanopatterning technique allows the fabrication of periodic nanoparticle (NP) arrays with 5 nm gaps among the NPs, however, it still faces a significant challenge in realizing the reliable distribution of nanogaps over a large area, because of the unavoidable collapse of the UTAM pore wall during the traditional one-step homothermal pore-widening process. Herein, an efficient two-step poikilothermal pore-widening process was developed to precisely control the pore wall etching of a UTAM, enabling effectively avoiding the fragmentation of the UTAM and finally obtaining a large-scale UTAM with a pore wall thickness of about 5 nm. As a result, large-scale NP arrays with high-density sub-5 nm and even smaller gaps between the neighboring NPs have been realized through applying the as-prepared UTAM as the nanopatterning template. These NP arrays with sub-5 nm gaps show ultrahigh SERS sensitivity (signal enhancement improved by an order of magnitude compared with NP arrays with 5 nm gaps) and good reproducibility, which demonstrates the practical feasibility of this promising two-step pore-widening UTAM technique for the fabrication of high-performance active SERS substrates with large-scale ultra-small nanogaps.
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Affiliation(s)
- Ning Yuan
- Institute of Nanochemistry and Nanobiology, School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, People's Republic of China
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19
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Wang L, Wang Z, Li L, Zhang J, Liu J, Hu J, Wu X, Weng Z, Chu X, Li J, Qiao Z. Magnetic-plasmonic Ni@Au core-shell nanoparticle arrays and their SERS properties. RSC Adv 2020; 10:2661-2669. [PMID: 35496119 PMCID: PMC9048804 DOI: 10.1039/c9ra10354f] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2019] [Accepted: 01/08/2020] [Indexed: 12/20/2022] Open
Abstract
In this paper, large-area magnetic-plasmonic Ni@Au core-shell nanoparticle arrays (NPAs) with tunable compositions were successfully fabricated by a direct laser interference ablation (DLIA) incorporated with thermal dewetting method. The magnetic properties of the Ni@Au core-shell NPAs were analyzed and the saturation magnetization (M s) of the Ni80@Au20 nanoparticles was found to be higher than that of nickel-only nanoparticles with the same diameter. Using Rhodamine 6G (R6G) as a Raman reporter molecule, the surface enhanced Raman scattering (SERS) property of the Ni@Au core-shell NPAs with a grain size distribution of 48 ± 42 nm and a short-distance order of about 200 nm was examined. A SERS enhancement factor of 2.5 × 106 was realized on the Ni50@Au50 NPA substrate, which was 9 times higher than that for Au nanoparticles with the same size distribution. This was due to the enhanced local surface plasmon resonance (LSPR) between the ferromagnetic Ni cores and the surface polariton of the Au shells of each nanoparticle. The fabrication of the Ni@Au core-shell NPAs with different compositions offers a new avenue to tailor the optical and magnetic properties of the nanostructured films for chemical and diagnostic applications.
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Affiliation(s)
- Lu Wang
- International Research Centre for Nano Handling and Manufacturing of China, Changchun University of Science and Technology Changchun 130022 China +86 431 85582925 +86 431 85582926
- Ministry of Education Key Laboratory for Cross-Scale Micro and Nano Manufacturing, Changchun University of Science and Technology Changchun 130022 China
| | - Zuobin Wang
- International Research Centre for Nano Handling and Manufacturing of China, Changchun University of Science and Technology Changchun 130022 China +86 431 85582925 +86 431 85582926
- Ministry of Education Key Laboratory for Cross-Scale Micro and Nano Manufacturing, Changchun University of Science and Technology Changchun 130022 China
| | - Li Li
- International Research Centre for Nano Handling and Manufacturing of China, Changchun University of Science and Technology Changchun 130022 China +86 431 85582925 +86 431 85582926
- Ministry of Education Key Laboratory for Cross-Scale Micro and Nano Manufacturing, Changchun University of Science and Technology Changchun 130022 China
| | - Jingran Zhang
- International Research Centre for Nano Handling and Manufacturing of China, Changchun University of Science and Technology Changchun 130022 China +86 431 85582925 +86 431 85582926
| | - Jinyun Liu
- College of Information Engineering, North China University of Science and Technology Tangshan 063210 China
| | - Jing Hu
- International Research Centre for Nano Handling and Manufacturing of China, Changchun University of Science and Technology Changchun 130022 China +86 431 85582925 +86 431 85582926
| | - Xiaomin Wu
- International Research Centre for Nano Handling and Manufacturing of China, Changchun University of Science and Technology Changchun 130022 China +86 431 85582925 +86 431 85582926
| | - Zhankun Weng
- International Research Centre for Nano Handling and Manufacturing of China, Changchun University of Science and Technology Changchun 130022 China +86 431 85582925 +86 431 85582926
- Ministry of Education Key Laboratory for Cross-Scale Micro and Nano Manufacturing, Changchun University of Science and Technology Changchun 130022 China
| | - Xueying Chu
- School of Science, Changchun University of Science and Technology Changchun 130022 China
| | - Jinhua Li
- School of Science, Changchun University of Science and Technology Changchun 130022 China
| | - Zhongliang Qiao
- Key Laboratory of Laser Technology and Optoelectronic Functional Materials of Hainan Province, School of Physics and Electronic Engineering, Hainan Normal University Haikou 571158 China +86 898-65861468 +86 898 65861468
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20
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Kim D, Lee J, Yoo S, Choi S, Park D, Park S. Quantitative Surface-Enhanced Raman Spectroscopy Analysis through 3D Superlattice Arrays of Au Nanoframes with Attomolar Detection. Anal Chem 2019; 92:1972-1977. [DOI: 10.1021/acs.analchem.9b04339] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Dajeong Kim
- Department of Chemistry, Sungkyunkwan University, Suwon 16419, South Korea
| | - Jinhaeng Lee
- Department of Chemistry, Sungkyunkwan University, Suwon 16419, South Korea
| | - Sungjae Yoo
- Department of Chemistry, Sungkyunkwan University, Suwon 16419, South Korea
| | - Sungwoo Choi
- Department of Applied Optics and Physics, Hallym University, Chuncheon 24252, South Korea
| | - Doojae Park
- Department of Applied Optics and Physics, Hallym University, Chuncheon 24252, South Korea
| | - Sungho Park
- Department of Chemistry, Sungkyunkwan University, Suwon 16419, South Korea
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21
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Weatherston JD, Yuan S, Mashuga CV, Wu HJ. Multi-functional SERS substrate: collection, separation, and identification of airborne chemical powders on a single device. SENSORS AND ACTUATORS. B, CHEMICAL 2019; 297:126765. [PMID: 32831480 PMCID: PMC7442113 DOI: 10.1016/j.snb.2019.126765] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Due to its extreme sensitivity and fingerprint specificity, surface enhanced Raman spectroscopy (SERS) is a powerful tool for substance identification. Developments in portable low-cost SERS substrates and handheld Raman spectrometers enable SERS analysis at sample origin, with great potential benefit to field-work applications in numerous disciplines. This study reports a procedure which incorporates sample collection, isolation, and SERS identification of airborne solids on a single inexpensive substrate. This procedure, vacuum filtration-paper chromatography-SERS (VF-PC-SERS), utilizes a porous filter paper decorated with plasmonic nanoparticles which we call nanopaper. The porous fiber structure facilitates both the vacuum filter powder capture and the isolation of components by paper chromatography, while the nanoplasmonic coating enhances Raman signal. One potentially high-impact application of VF-PC-SERS is field analysis of hazardous or illicit materials. This study demonstrates a proof-of-concept for VF-PC-SERS using powdered rhodamine 6G (R6G) dispersed in air, resulting in 100% detection accuracy (true positive rate) at R6G levels as low as 0.6 mg/m3. Analysis of R6G contaminated with topsoil or lactose resulted in specific identification of R6G in powder mixtures containing as little as 0.1 wt. % R6G. This study demonstrates the feasibility of VF-PC-SERS as a safer procedure to identify hazardous substances at the point of sample origin.
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Affiliation(s)
- Joshua D. Weatherston
- Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, TX 77843-3122, USA
| | - Shuai Yuan
- Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, TX 77843-3122, USA
| | - Chad V. Mashuga
- Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, TX 77843-3122, USA
- Correspondence: ,
| | - Hung-Jen Wu
- Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, TX 77843-3122, USA
- Correspondence: ,
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22
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Restaino SM, White IM. A critical review of flexible and porous SERS sensors for analytical chemistry at the point-of-sample. Anal Chim Acta 2018; 1060:17-29. [PMID: 30902328 DOI: 10.1016/j.aca.2018.11.057] [Citation(s) in RCA: 63] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2018] [Revised: 11/27/2018] [Accepted: 11/29/2018] [Indexed: 12/26/2022]
Abstract
For decades surface enhanced Raman spectroscopy (SERS) has been intensely investigated as a possible solution for performing analytical chemistry at the point of sample origin. Unfortunately, due to cost and usability constraints, conventional rigid SERS sensors and microfluidic SERS sensors have yet to make a significant impact outside of the realm of academics. However, the recently introduced flexible and porous paper-based SERS sensors are proving to be widely adaptable to realistic usage cases in the field. In contrast to rigid and microfluidic SERS sensors, paper SERS sensors feature (i) the potential for roll-to-roll manufacturing methods that enable low sensor cost, (ii) simple sample collection directly onto the sensor via swabbing or dipping, and (iii) equipment-free separations for sample cleanup. In this review we argue that movement to paper-based SERS sensors will finally enable point-of-sample analytical chemistry applications. In addition, we present and compare the numerous fabrication techniques for paper SERS sensors and we describe various sample collection and sample clean-up capabilities of paper SERS sensors, with a focus on how these features enable practical applications in the field. Finally, we present our expectations for the future, including emerging ideas inspired by paper SERS.
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Affiliation(s)
| | - Ian M White
- Fischell Department of Bioengineering, University of Maryland, United States.
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Hwang JS, Yang M. Sensitive and Reproducible Gold SERS Sensor Based on Interference Lithography and Electrophoretic Deposition. SENSORS (BASEL, SWITZERLAND) 2018; 18:E4076. [PMID: 30469441 PMCID: PMC6263928 DOI: 10.3390/s18114076] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Revised: 11/19/2018] [Accepted: 11/20/2018] [Indexed: 02/06/2023]
Abstract
Surface-enhanced Raman spectroscopy (SERS) is a promising analytical tool due to its label-free detection ability and superior sensitivity, which enable the detection of single molecules. Since its sensitivity is highly dependent on localized surface plasmon resonance, various methods have been applied for electric field-enhanced metal nanostructures. Despite the intensive research on practical applications of SERS, fabricating a sensitive and reproducible SERS sensor using a simple and low-cost process remains a challenge. Here, we report a simple strategy to produce a large-scale gold nanoparticle array based on laser interference lithography and the electrophoretic deposition of gold nanoparticles, generated through a pulsed laser ablation in liquid process. The fabricated gold nanoparticle array produced a sensitive, reproducible SERS signal, which allowed Rhodamine 6G to be detected at a concentration as low as 10-8 M, with an enhancement factor of 1.25 × 10⁵. This advantageous fabrication strategy is expected to enable practical SERS applications.
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Affiliation(s)
- June Sik Hwang
- Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea.
| | - Minyang Yang
- Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea.
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Jin CM, Lee W, Kim D, Kang T, Choi I. Photothermal Convection Lithography for Rapid and Direct Assembly of Colloidal Plasmonic Nanoparticles on Generic Substrates. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2018; 14:e1803055. [PMID: 30294867 DOI: 10.1002/smll.201803055] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2018] [Revised: 09/11/2018] [Indexed: 06/08/2023]
Abstract
Controlled assembly of colloidal nanoparticles onto solid substrates generally needs to overcome their thermal diffusion in water. For this purpose, several techniques that are based on chemical bonding, capillary interactions with substrate patterning, optical force, and optofluidic heating of light-absorbing substrates are proposed. However, the direct assembly of colloidal nanoparticles on generic substrates without chemical linkers and substrate patterning still remains challenging. Here, photothermal convection lithography is proposed, which allows the rapid placement of colloidal nanoparticles onto the surface of diverse solid substrates. It is based on local photothermal heating of colloidal nanoparticles by resonant light focusing without substrate heating, which induces convective flow. The convective flow, then, forces the colloidal nanoparticles to assemble at the illumination point of light. The size of the assembly is increased by either increasing the light intensity or illumination time. It is shown that three types of colloidal gold nanoparticles with different shapes (rod, star, and sphere) can be uniformly assembled by the proposed method. Each assembly with a diameter of tens of micrometers can be completed within a minute and its patterned arrays can also be achieved rapidly.
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Affiliation(s)
- Chang Min Jin
- Department of Life Science, University of Seoul, Seoul, 130-743, Republic of Korea
| | - Wooju Lee
- Department of Mechanical Engineering, Sogang University, Seoul, 121-742, Republic of Korea
| | - Dongchoul Kim
- Department of Mechanical Engineering, Sogang University, Seoul, 121-742, Republic of Korea
| | - Taewook Kang
- Department of Chemical and Biomolecular Engineering, Sogang University, Seoul, 121-742, Republic of Korea
| | - Inhee Choi
- Department of Life Science, University of Seoul, Seoul, 130-743, Republic of Korea
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Ni S, Isa L, Wolf H. Capillary assembly as a tool for the heterogeneous integration of micro- and nanoscale objects. SOFT MATTER 2018; 14:2978-2995. [PMID: 29611588 DOI: 10.1039/c7sm02496g] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
During the past decade, capillary assembly in topographical templates has evolved into an efficient method for the heterogeneous integration of micro- and nano-scale objects on a variety of surfaces. This assembly route has been applied to a large spectrum of materials of micrometer to nanometer dimensions, supplied in the form of aqueous colloidal suspensions. Using systems produced via bulk synthesis affords a huge flexibility in the choice of materials, holding promise for the realization of novel superior devices in the fields of optics, electronics and health, if they can be integrated into surface structures in a fast, simple, and reliable way. In this review, the working principles of capillary assembly and its fundamental process parameters are first presented and discussed. We then examine the latest developments in template design and tool optimization to perform capillary assembly in more robust and efficient ways. This is followed by a focus on the broad range of functional materials that have been realized using capillary assembly, from single components to large-scale heterogeneous multi-component assemblies. We then review current applications of capillary assembly, especially in optics, electronics, and in biomaterials. We conclude with a short summary and an outlook for future developments.
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Affiliation(s)
- Songbo Ni
- IBM Research - Zurich, Säumerstrasse 4, 8803 Rüschlikon, Switzerland.
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26
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Chai Z, Yilmaz C, Busnaina AA, Lissandrello CA, Carter DJD. Directed assembly-based printing of homogeneous and hybrid nanorods using dielectrophoresis. NANOTECHNOLOGY 2017; 28:475303. [PMID: 29027906 DOI: 10.1088/1361-6528/aa935f] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Printing nano and microscale three-dimensional (3D) structures using directed assembly of nanoparticles has many potential applications in electronics, photonics and biotechnology. This paper presents a reproducible and scalable 3D dielectrophoresis assembly process for printing homogeneous silica and hybrid silica/gold nanorods from silica and gold nanoparticles. The nanoparticles are assembled into patterned vias under a dielectrophoretic force generated by an alternating current (AC) field, and then completely fused in situ to form nanorods. The assembly process is governed by the applied AC voltage amplitude and frequency, pattern geometry, and assembly time. Here, we find out that complete assembly of nanorods is not possible without applying both dielectrophoresis and electrophoresis. Therefore, a direct current offset voltage is used to add an additional electrophoretic force to the assembly process. The assembly can be precisely controlled to print silica nanorods with diameters from 20-200 nm and spacing from 500 nm to 2 μm. The assembled nanorods have good uniformity in diameter and height over a millimeter scale. Besides homogeneous silica nanorods, hybrid silica/gold nanorods are also assembled by sequentially assembling silica and gold nanoparticles. The precision of the assembly process is further demonstrated by assembling a single particle on top of each nanorod to demonstrate an additional level of functionalization. The assembled hybrid silica/gold nanorods have potential to be used for metamaterial applications that require nanoscale structures as well as for plasmonic sensors for biosensing applications.
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Affiliation(s)
- Zhimin Chai
- NSF Nanoscale Science and Engineering Center for High-Rate Nanomanufacturing (CHN), Northeastern University, Boston, MA 02115, United States of America
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Quan J, Zhu Y, Zhang J, Li J, Wang N. High-performance surface-enhanced Raman scattering substrate prepared by self-assembling of silver nanoparticles into the nanogaps of silver nanoislands. APPLIED OPTICS 2017; 56:5751-5760. [PMID: 29047723 DOI: 10.1364/ao.56.005751] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2017] [Accepted: 06/15/2017] [Indexed: 06/07/2023]
Abstract
We report an effective and simple method to further enhance the surface-enhanced Raman scattering (SERS) by silver (Ag) nanoparticles (AgNPs) self-assembling into the nanogaps of an Ag nanoisland (AgNIs). The AgNIs prepared by dewetting of Ag film created a nanorough surface, which induced the Ag nanoparticles to regularly deposit into the nanogaps. AgNPs and AgNIs samples were also prepared for comparative analysis. Their SERS activities were investigated theoretically and experimentally. Experimental enhancement factors (EFs) for AgNPs, AgNIs, and AgNPs decorated AgNIs substrate (AgNPs-AgNIs) were ∼107, ∼106, ∼108, respectively, with relative standard deviation (RSD) of 66.1%, 12.9%, and 13.2%. Remarkable enhancement (EF≈108) and excellent reproducibility (RSD=13.2%) indicated the AgNPs-AgNIs had a high potential in practical application. Electromagnetic simulation using COMSOL Multiphysics demonstrated that the additional enhancement of the SERS effect could be mainly attributed to the improvement of the local electromagnetic field. Moreover, the deposition process of Ag nanoparticles was analyzed in detail to understand the reproducibility of AgNPs-AgNIs.
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28
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Dies H, Raveendran J, Escobedo C, Docoslis A. In situ assembly of active surface-enhanced Raman scattering substrates via electric field-guided growth of dendritic nanoparticle structures. NANOSCALE 2017; 9:7847-7857. [PMID: 28555703 DOI: 10.1039/c7nr01743j] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Surface-enhanced Raman scattering (SERS) can provide ultrasensitive detection of chemical and biological analytes down to the level of a single molecule. The need for costly, nanostructured, noble-metal substrates, however, poses a major obstacle in the widespread application of the method. Here we present for the first time a novel type of metallic nanostructured substrates that, not only exhibit a remarkable SERS activity, but are also produced in a facile, cost-effective and nanofabrication-free manner. The substrates are formed through an electric field-guided assembly process of silver nanocolloids, which results in extended and interconnected dendritic nanoparticle structures with a high density of "hot spots". A unique and significant performance attribute of these nanostructures is their ability to also function as concentration amplification devices, thereby further enhancing their analyte detection efficiency. This major advantage against conventional SERS substrates is illustrated experimentally here with the concentration and detection of proteins from solution. Low limits of detection for illicit drugs, food contaminants and pesticides in relevant matrices are also demonstrated. The SERS-active dendrites are reusable and can be removed and replaced in a few minutes. The SERS substrates presented herein constitute a significant advance towards more effective and less expensive diagnostic tools.
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Affiliation(s)
- Hannah Dies
- Department of Chemical Engineering, Queen's University, Kingston, ON, K7L 3N6 Canada.
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29
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Yilmaz C, Sarisozen C, Torchilin V, Busnaina A. Novel Nanoprinting for Oral Delivery of Poorly Soluble Drugs. Methodist Debakey Cardiovasc J 2017; 12:157-162. [PMID: 27826370 DOI: 10.14797/mdcj-12-3-157] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
Many of the newly developed drugs for cancer, and some of those for cardiovascular disease, are poorly soluble in water and cannot be taken orally. This can be overcome by employing a new and effective delivery system utilizing nanotechnology. We present a new method for oral preparation of poorly soluble drugs that entails assembling (printing) drug-loaded polymeric micelles into sub-100 nm orally acceptable nanorods (NRs). Due to their small size, these NRs will have a high permeability through cells and thus should transport through the intestine to allow for drug delivery in the blood. These NRs drugs are expected to penetrate tumors more efficiently and much faster than individual nanoparticles and may also be useful for drug delivery to atherosclerotic plaque. This should lead to better bioavailability of the drug with reduced toxicity and side effects. Currently used micellar formulations are administered intravenously, which is invasive and could be toxic due to high doses and interaction with normal healthy tissues. Oral drug administration is the easiest and most desirable way to deliver most drugs, including those that are poorly soluble.
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30
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Surface-Enhanced Raman Scattering-Based Immunoassay Technologies for Detection of Disease Biomarkers. BIOSENSORS-BASEL 2017; 7:bios7010007. [PMID: 28085088 PMCID: PMC5371780 DOI: 10.3390/bios7010007] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/06/2016] [Revised: 01/02/2017] [Accepted: 01/03/2017] [Indexed: 01/01/2023]
Abstract
Detection of biomarkers is of vital importance in disease detection, management, and monitoring of therapeutic efficacy. Extensive efforts have been devoted to the development of novel diagnostic methods that detect and quantify biomarkers with higher sensitivity and reliability, contributing to better disease diagnosis and prognosis. When it comes to such devastating diseases as cancer, these novel powerful methods allow for disease staging as well as detection of cancer at very early stages. Over the past decade, there have been some advances in the development of platforms for biomarker detection of diseases. The main focus has recently shifted to the development of simple and reliable diagnostic tests that are inexpensive, accurate, and can follow a patient’s disease progression and therapy response. The individualized approach in biomarker detection has been also emphasized with detection of multiple biomarkers in body fluids such as blood and urine. This review article covers the developments in Surface-Enhanced Raman Scattering (SERS) and related technologies with the primary focus on immunoassays. Limitations and advantages of the SERS-based immunoassay platform are discussed. The article thoroughly describes all components of the SERS immunoassay and highlights the superior capabilities of SERS readout strategy such as high sensitivity and simultaneous detection of a multitude of biomarkers. Finally, it introduces recently developed strategies for in vivo biomarker detection using SERS.
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31
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Restaino SM, Berger A, White IM. Inkjet-Printed Paper Fluidic Devices for Onsite Detection of Antibiotics Using Surface-Enhanced Raman Spectroscopy. Methods Mol Biol 2017; 1572:525-540. [PMID: 28299709 DOI: 10.1007/978-1-4939-6911-1_33] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Surface enhanced Raman spectroscopy (SERS) provides rapid and sensitive identification of small molecule analytes. Traditionally, fabrication of SERS devices is an expensive process that involves the use of micro- and nano-fabrication procedures. Further, acquisition of diverse sample types requires complex preparation procedures that limits SERS to lab-based applications. Recent innovations using plasmonic nanoparticles embedded in flexible paper substrates has allowed the expansion of SERS techniques to portable analytical procedures. Recently inkjet-printing has been identified as a low cost, rapid, and highly customizable method for producing paper based SERS sensors with robust performance. This chapter details the materials and procedures by which inkjet printed SERS sensors can be fabricated and applied to relevant applications. In particular, methods for utilizing the sensors for detection of antibiotics are presented.
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Affiliation(s)
- Stephen M Restaino
- Fischell Department of Bioengineering, University of Maryland, 2216 Jeong H. Kim Engr. Building, College Park, MD, 20742, USA
| | - Adam Berger
- Fischell Department of Bioengineering, University of Maryland, 2216 Jeong H. Kim Engr. Building, College Park, MD, 20742, USA
| | - Ian M White
- Fischell Department of Bioengineering, University of Maryland, 2216 Jeong H. Kim Engr. Building, College Park, MD, 20742, USA.
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32
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Fouda AN, El Basaty AB, Eid EA. Photo-Response of Functionalized Self-Assembled Graphene Oxide on Zinc Oxide Heterostructure to UV Illumination. NANOSCALE RESEARCH LETTERS 2016; 11:13. [PMID: 26754939 PMCID: PMC4709344 DOI: 10.1186/s11671-015-1221-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2015] [Accepted: 12/27/2015] [Indexed: 05/29/2023]
Abstract
Convective assembly technique which is a simple and scalable method was used for coating uniform graphene oxide (GO) nanosheets on zinc oxide (ZnO) thin films. Upon UV irradiation, an enhancement in the on-off ratio was observed after functionalizing ZnO films by GO nanosheets. The calculations of on-off ratio, the device responsivity, and the external quantum efficiency were investigated and implied that the GO layer provides a stable pathway for electron transport. Structural investigations of the assembled GO and the heterostructure of GO on ZnO were performed using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). The covered GO layer has a wide continuous area, with wrinkles and folds at the edges. In addition, the phonon lattice vibrations were investigated by Raman analysis. For GO and the heterostructure, a little change in the ratio between the D-band and G-band was found which means that no additional defects were formed within the heterostructure.
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Affiliation(s)
- A N Fouda
- Physics Department, Faculty of Science, Suez Canal University, Ismailia, 41522, Egypt.
- Recruitment Department, University of Hail, Hail, 2440, Kingdom of Saudi Arabia.
| | - A B El Basaty
- Basic Science Department, Faculty of Industrial Education, Helwan University, Cairo, Egypt
| | - E A Eid
- Department of Basic Science, Higher Technological Institute, 10th of Ramadan City, Egypt
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Zeng Z, Liu L, Wang Y, Zhou Q, Su S, Hu D, Han B, Jin M, Ao X, Zhan R, Gao X, Lu X, Zhou G, Senz S, Zhang Z, Liu J. Highly reproducible surface-enhanced Raman scattering substrate for detection of phenolic pollutants. NANOTECHNOLOGY 2016; 27:455301. [PMID: 27698285 DOI: 10.1088/0957-4484/27/45/455301] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The ordering degree of nanostructures is the key to determining the uniformity of surface-enhanced Raman scattering (SERS). However, fabrication of large-area ordered nanostructures remains a challenge, especially with the ultrahigh-density (>1010 cm-2). Here, we report a fabrication of large-area ultrahigh-density ordered Ag@Al2O3/Ag core-shell nanosphere (NS) arrays with tunable nanostructures. The ultrahigh-density (2.8 × 1010 cm-2) ordered NS arrays over a large-area capability (diameter >4.0 cm) enable the uniform SERS signals with the relative standard deviation of less than 5%. The as-fabricated highly reproducible SERS substrate can be applied to detect trace phenolic pollutants in water. This work does not only provide a new route for synthesizing the ultrahigh-density ordered nanostructures, but also create a new class of SERS substrates with high sensitivity and excellent reproducibility.
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Affiliation(s)
- Zhiqiang Zeng
- Institute for Advanced Materials and Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Normal University, Guangzhou 510006, People's Republic of China
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Ni S, Leemann J, Buttinoni I, Isa L, Wolf H. Programmable colloidal molecules from sequential capillarity-assisted particle assembly. SCIENCE ADVANCES 2016; 2:e1501779. [PMID: 27051882 PMCID: PMC4820371 DOI: 10.1126/sciadv.1501779] [Citation(s) in RCA: 87] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2015] [Accepted: 02/13/2016] [Indexed: 05/19/2023]
Abstract
The assembly of artificial nanostructured and microstructured materials which display structures and functionalities that mimic nature's complexity requires building blocks with specific and directional interactions, analogous to those displayed at the molecular level. Despite remarkable progress in synthesizing "patchy" particles encoding anisotropic interactions, most current methods are restricted to integrating up to two compositional patches on a single "molecule" and to objects with simple shapes. Currently, decoupling functionality and shape to achieve full compositional and geometrical programmability remains an elusive task. We use sequential capillarity-assisted particle assembly which uniquely fulfills the demands described above. This is a new method based on simple, yet essential, adaptations to the well-known capillary assembly of particles over topographical templates. Tuning the depth of the assembly sites (traps) and the surface tension of moving droplets of colloidal suspensions enables controlled stepwise filling of traps to "synthesize" colloidal molecules. After deposition and mechanical linkage, the colloidal molecules can be dispersed in a solvent. The template's shape solely controls the molecule's geometry, whereas the filling sequence independently determines its composition. No specific surface chemistry is required, and multifunctional molecules with organic and inorganic moieties can be fabricated. We demonstrate the "synthesis" of a library of structures, ranging from dumbbells and triangles to units resembling bar codes, block copolymers, surfactants, and three-dimensional chiral objects. The full programmability of our approach opens up new directions not only for assembling and studying complex materials with single-particle-level control but also for fabricating new microscale devices for sensing, patterning, and delivery applications.
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Affiliation(s)
- Songbo Ni
- Laboratory for Interfaces, Soft Matter, and Assembly, Department of Materials, ETH Zurich, Vladimir-Prelog-Weg 5, 8093 Zurich, Switzerland
- IBM Research–Zurich, Säumerstrasse 4, 8803 Rüschlikon, Switzerland
| | - Jessica Leemann
- Laboratory for Interfaces, Soft Matter, and Assembly, Department of Materials, ETH Zurich, Vladimir-Prelog-Weg 5, 8093 Zurich, Switzerland
- IBM Research–Zurich, Säumerstrasse 4, 8803 Rüschlikon, Switzerland
| | - Ivo Buttinoni
- Laboratory for Interfaces, Soft Matter, and Assembly, Department of Materials, ETH Zurich, Vladimir-Prelog-Weg 5, 8093 Zurich, Switzerland
| | - Lucio Isa
- Laboratory for Interfaces, Soft Matter, and Assembly, Department of Materials, ETH Zurich, Vladimir-Prelog-Weg 5, 8093 Zurich, Switzerland
- Corresponding author. E-mail: (L.I.); (H.W.)
| | - Heiko Wolf
- IBM Research–Zurich, Säumerstrasse 4, 8803 Rüschlikon, Switzerland
- Corresponding author. E-mail: (L.I.); (H.W.)
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35
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Zhang M, Zhao A, Wang D, Sun H. Hierarchically assembled NiCo@SiO2@Ag magnetic core-shell microspheres as highly efficient and recyclable 3D SERS substrates. Analyst 2015; 140:440-8. [PMID: 25422829 DOI: 10.1039/c4an01275e] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The hierarchically nanosheet-assembled NiCo@SiO2@Ag (NSA) core-shell microspheres have been synthesized by a layer-by-layer procedure at ambient temperature. The mean particle size of NSA microspheres is about 1.7 μm, which is made up of some nanosheets with an average thickness of ∼20 nm. The outer silver shell surface structures can be controlled well by adjusting the concentration of Ag(+) ions and the reaction times. The obtained NSA 3D micro/nanostructures show a structure enhanced SERS performance, which can be attributed to the special nanoscale configuration with wedge-shaped surface architecture. We find that NSA microspheres with nanosheet-assembled shell structure exhibit the highest enhancement efficiency and high SERS sensitivity to p-ATP and MBA molecules. We show that the detection limits for both p-ATP and MBA of the optimized NSA microsphere substrates can approach 10(-7) M. And the relative standard deviation of the Raman peak maximum is ∼13%, which indicates good uniformity of the substrate. In addition, the magnetic NSA microspheres with high saturation magnetization show a quick magnetic response, good recoverability and recyclability. Therefore, such NSA microspheres may have great practical potential applications in rapid and reproducible trace detection of chemical, biological and environment pollutants with a simple portable Raman instrument.
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Affiliation(s)
- Maofeng Zhang
- Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, 230031, P. R. China.
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Ye M, Wei Z, Hu F, Wang J, Ge G, Hu Z, Shao M, Lee ST, Liu J. Fast assembling microarrays of superparamagnetic Fe3O4@Au nanoparticle clusters as reproducible substrates for surface-enhanced Raman scattering. NANOSCALE 2015; 7:13427-13437. [PMID: 26079311 DOI: 10.1039/c5nr02491a] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
It is currently a very active research area to develop new types of substrates which integrate various nanomaterials for surface-enhanced Raman scattering (SERS) techniques. Here we report a unique approach to prepare SERS substrates with reproducible performance. It features silicon mold-assisted magnetic assembling of superparamagnetic Fe3O4@Au nanoparticle clusters (NCs) into arrayed microstructures on a wafer scale. This approach enables the fabrication of both silicon-based and hydrogel-based substrates in a sequential manner. We have demonstrated that strong SERS signals can be harvested from these substrates due to an efficient coupling effect between Fe3O4@Au NCs, with enhancement factors >10(6). These substrates have been confirmed to provide reproducible SERS signals, with low variations in different locations or batches of samples. We investigate the spatial distributions of electromagnetic field enhancement around Fe3O4@Au NCs assemblies using finite-difference-time-domain (FDTD) simulations. The procedure to prepare the substrates is straightforward and fast. The silicon mold can be easily cleaned out and refilled with Fe3O4@Au NCs assisted by a magnet, therefore being re-useable for many cycles. Our approach has integrated microarray technologies and provided a platform for thousands of independently addressable SERS detection, in order to meet the requirements of a rapid, robust, and high throughput performance.
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Affiliation(s)
- Min Ye
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-based Functional Materials & Devices, Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, Jiangsu Province 215123, China.
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37
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Fu Q, Zhan Z, Dou J, Zheng X, Xu R, Wu M, Lei Y. Highly Reproducible and Sensitive SERS Substrates with Ag Inter-Nanoparticle Gaps of 5 nm Fabricated by Ultrathin Aluminum Mask Technique. ACS APPLIED MATERIALS & INTERFACES 2015; 7:13322-13328. [PMID: 26023763 DOI: 10.1021/acsami.5b01524] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Applicable surface enhanced Raman scattering (SERS) active substrates require high enhancement factor (EF), excellent spatial reproducibility, and low-cost fabrication method on a large area. Although several SERS substrates with high EF and relative standard deviation (RSD) of signal less than 5% were reported, reliable fabrication for large area SERS substrates with both high sensitivity and high reproducibility via low-cost routes remains a challenge. Here, we report a facile and cost-effective fabrication process for large-scale SERS substrate with Ag inter-nanoparticle (NP) gaps of 5 nm based on ultrathin alumina mask (UTAM) surface pattern technique. Such closely packed Ag NP arrays with high density of electromagnetic field enhancement ("hot spots") on large area exhibit high SERS activity and excellent reproducibility, simultaneously. Rhodamine 6G molecules with concentration of 1 × 10(-7) M are used to determine the SERS performance, and an EF of ∼10(9) is obtained. It should be noted that we obtain RSDs about 2% from 10 random spots on an area of 1 cm(2), which implies the highly reproducible signals. Finite-difference time-domain simulations further suggest that the enhanced electric field originates from the narrow gap, which agrees well with the experimental results. The low value of RSD and the high EF of SERS signals indicate that the as-prepared substrate may be promising for highly sensitive and uniform SERS detection.
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Affiliation(s)
- Qun Fu
- †Institute of Nanochemistry and Nanobiology, School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, P. R. China
| | - Zhibing Zhan
- ‡Institute for Physics and IMN MacroNano (ZIK), Technical University of Ilmenau, Prof. Schmidt Straße 26, 98693 Ilmenau, Germany
| | - Jinxia Dou
- †Institute of Nanochemistry and Nanobiology, School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, P. R. China
| | - Xianzheng Zheng
- †Institute of Nanochemistry and Nanobiology, School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, P. R. China
| | - Rui Xu
- ‡Institute for Physics and IMN MacroNano (ZIK), Technical University of Ilmenau, Prof. Schmidt Straße 26, 98693 Ilmenau, Germany
| | - Minghong Wu
- †Institute of Nanochemistry and Nanobiology, School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, P. R. China
| | - Yong Lei
- †Institute of Nanochemistry and Nanobiology, School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, P. R. China
- ‡Institute for Physics and IMN MacroNano (ZIK), Technical University of Ilmenau, Prof. Schmidt Straße 26, 98693 Ilmenau, Germany
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Park M, Oh YJ, Park SG, Yang SB, Jeong KH. Electrokinetic preconcentration of small molecules within volumetric electromagnetic hotspots in surface enhanced Raman scattering. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2015; 11:2487-92. [PMID: 25644498 DOI: 10.1002/smll.201402942] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2014] [Revised: 12/30/2014] [Indexed: 05/08/2023]
Abstract
The on-chip integration of a preconcentration chamber for ultrasensitive surface-enhanced Raman scattering (SERS) is shown. Small molecules are preconcentrated using 3D volumetric electromagnetic hotspots. The experimental results demonstrate an enhancement of the SERS signals of over two orders of magnitude, which allows the fingerprinting of neurotransmitter molecules at the nanomolar level and furthers the selective detection of oppositely charged molecules. This on-chip integration will provide new directions for ultrasensitive SERS applications.
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Affiliation(s)
- Moonseong Park
- Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 305-701, Korea
| | - Young-Jae Oh
- Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 305-701, Korea
| | - Sang-Gil Park
- Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 305-701, Korea
| | - Seung-Bum Yang
- Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 305-701, Korea
| | - Ki-Hun Jeong
- Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 305-701, Korea
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Fu Q, Wong KM, Zhou Y, Wu M, Lei Y. Ni/Au hybrid nanoparticle arrays as a highly efficient, cost-effective and stable SERS substrate. RSC Adv 2015. [DOI: 10.1039/c4ra09312g] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
A large-area highly efficient, cost-effective and stable SERS substrate is synthesized with a proposed versatile and simple process.
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Affiliation(s)
- Qun Fu
- Institute of Nanochemistry and Nanobiology
- School of Environmental and Chemical Engineering
- Shanghai University
- Shanghai
- P. R. China
| | - Kin Mun Wong
- Institute for Physics and IMN MacroNano® (ZIK)
- Technical University of Ilmenau
- 98693 Ilmenau
- Germany
| | - Yi Zhou
- Institute of Nanochemistry and Nanobiology
- School of Environmental and Chemical Engineering
- Shanghai University
- Shanghai
- P. R. China
| | - Minghong Wu
- Institute of Nanochemistry and Nanobiology
- School of Environmental and Chemical Engineering
- Shanghai University
- Shanghai
- P. R. China
| | - Yong Lei
- Institute of Nanochemistry and Nanobiology
- School of Environmental and Chemical Engineering
- Shanghai University
- Shanghai
- P. R. China
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Hu Z, Liu Z, Li L, Quan B, Li Y, Li J, Gu C. Wafer-scale double-layer stacked Au/Al2O3@Au nanosphere structure with tunable nanospacing for surface-enhanced Raman scattering. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2014; 10:3933-3942. [PMID: 24995658 DOI: 10.1002/smll.201400509] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2014] [Revised: 06/10/2014] [Indexed: 06/03/2023]
Abstract
Fabricating perfect plasmonic nanostructures has been a major challenge in surface enhanced Raman scattering (SERS) research. Here, a double-layer stacked Au/Al2O3@Au nanosphere structures is designed on the silicon wafer to bring high density, high intensity "hot spots" effect. A simply reproducible high-throughput approach is shown to fabricate feasibly this plasmonic nanostructures by rapid thermal annealing (RTA) and atomic layer deposition process (ALD). The double-layer stacked Au nanospheres construct a three-dimensional plasmonic nanostructure with tunable nanospacing and high-density nanojunctions between adjacent Au nanospheres by ultrathin Al2O3 isolation layer, producing highly strong plasmonic coupling so that the electromagnetic near-field is greatly enhanced to obtain a highly uniform increase of SERS with an enhancement factor (EF) of over 10(7). Both heterogeneous nanosphere group (Au/Al2O@Ag) and pyramid-shaped arrays structure substrate can help to increase the SERS signals further, with a EF of nearly 10(9). These wafer-scale, high density homo/hetero-metal-nanosphere arrays with tunable nanojunction between adjacent shell-isolated nanospheres have significant implications for ultrasensitive Raman detection, molecular electronics, and nanophotonics.
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Affiliation(s)
- Zhaosheng Hu
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, P. R. China
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Yilmaz C, Cetin AE, Goutzamanidis G, Huang J, Somu S, Altug H, Wei D, Busnaina A. Three-dimensional crystalline and homogeneous metallic nanostructures using directed assembly of nanoparticles. ACS NANO 2014; 8:4547-4558. [PMID: 24738844 DOI: 10.1021/nn500084g] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Directed assembly of nano building blocks offers a versatile route to the creation of complex nanostructures with unique properties. Bottom-up directed assembly of nanoparticles have been considered as one of the best approaches to fabricate such functional and novel nanostructures. However, there is a dearth of studies on making crystalline, solid, and homogeneous nanostructures. This requires a fundamental understanding of the forces driving the assembly of nanoparticles and precise control of these forces to enable the formation of desired nanostructures. Here, we demonstrate that colloidal nanoparticles can be assembled and simultaneously fused into 3-D solid nanostructures in a single step using externally applied electric field. By understanding the influence of various assembly parameters, we showed the fabrication of 3-D metallic materials with complex geometries such as nanopillars, nanoboxes, and nanorings with feature sizes as small as 25 nm in less than a minute. The fabricated gold nanopillars have a polycrystalline nature, have an electrical resistivity that is lower than or equivalent to electroplated gold, and support strong plasmonic resonances. We also demonstrate that the fabrication process is versatile, as fast as electroplating, and scalable to the millimeter scale. These results indicate that the presented approach will facilitate fabrication of novel 3-D nanomaterials (homogeneous or hybrid) in an aqueous solution at room temperature and pressure, while addressing many of the manufacturing challenges in semiconductor nanoelectronics and nanophotonics.
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Affiliation(s)
- Cihan Yilmaz
- NSF Nanoscale Science and Engineering Center for High-Rate Nanomanufacturing (CHN), Northeastern University , Boston, Massachusetts 02115, United States
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Zhu Y, Li M, Yu D, Yang L. A novel paper rag as 'D-SERS' substrate for detection of pesticide residues at various peels. Talanta 2014; 128:117-24. [PMID: 25059138 DOI: 10.1016/j.talanta.2014.04.066] [Citation(s) in RCA: 82] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2014] [Revised: 04/17/2014] [Accepted: 04/22/2014] [Indexed: 11/16/2022]
Abstract
Many important considerations in the design of practical Surface enhanced Raman spectroscopy (SERS) substrates are necessary, such as the low cost, simple preparation, mass production and high efficiency of sample collection, which the conventional rigid substrates are lack of. In this work, practical SERS substrates based on deposition of silver nanoparticles (Ag NPs) on commercially available low-cost filter paper were prepared by simple silver mirror reaction in a large scale, and utilized for rapid, portable and accurate identification and detection of pesticide residues at various peels. Compared with conventional substrates, this novel SERS substrate dramatically enhanced the sample collection efficiency by simply swabbing paper-based device across different surfaces without destroying the sample, meanwhile avoiding the substrate signal of real-world samples. Considering their low cost, portability, simplicity and high sample collection efficiency, Ag NP-decorated filter paper, as practical SERS substrate, are used in solving critical problems for detection of pesticide residues at various peels. SERS experiments were carried out on Ag NP-decorated filter paper combined with 'dynamic SERS' (D-SERS) due to its high detection sensitivity. The excellent detection performance of the Ag NP-based filter paper was demonstrated by detection thiram and paraoxon residues at various peels. Besides, the stability and reproducibility of the practical substrates were also involved.
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Affiliation(s)
- Yiqun Zhu
- Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, China; School of Chemistry and Chemical Engineering, Anhui University, Hefei 230039, China
| | - Minqiang Li
- Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, China
| | - Daoyang Yu
- Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, China.
| | - Liangbao Yang
- Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, China.
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Zhou X, Zhou F, Liu H, Yang L, Liu J. Assembly of polymer-gold nanostructures with high reproducibility into a monolayer film SERS substrate with 5 nm gaps for pesticide trace detection. Analyst 2014; 138:5832-8. [PMID: 23912071 DOI: 10.1039/c3an00914a] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A very simple and versatile polymer assembly approach was developed. We use methoxy-mercapto-poly(ethylene glycol) (mPEG-SH) to conjugate multiple Au shapes to form dense Au monolayer films (MLFs) with 5 nm gaps and generate gigantic enhancement. The results of the discrete dipole approximation (DDA) method to calculate the local electric field distribution of the nanoparticle dimer are in agreement with the experimental data of sensitivity of multiple Au MLFs. 3D Raman spectra, relative standard deviation (RSD) calculation and Raman mapping were used to study the high-reproducibility of the assembled substrate, which is sufficient for trace pesticide residue detection.
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Affiliation(s)
- Xia Zhou
- Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei 230031, China.
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Huan J, Hu L, Fang X. Dense assembly of Gd2O3:0.05X3+ (X = Eu, Tb) nanorods into nanoscaled thin-films and their photoluminescence properties. ACS APPLIED MATERIALS & INTERFACES 2014; 6:1462-1469. [PMID: 24387245 DOI: 10.1021/am4037417] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
This paper presents a simple and effective oil-water interfacial self-assembly strategy to fabricate monolayer and bilayer nanofilms of densely packed Gd2O3:0.05X(3+) (X = Eu, Tb) nanorods with characteristic luminescence properties. In this process, Gd2O3:0.05X(3+) (X = Eu, Tb) nanotubes synthesized by a hydrothermal method are dispersed in deionized water; then, a certain amount of n-hexane is added to produce a hexane-water interface. With n-butanol added as initiator, the nanotubes are gradually trapped at the interface to form a densely packed nanofilm. A monolayer nanofilm of densely packed Gd2O3:0.05Eu(3+) nanorods is obtained after annealing. In addition, the bilayer nanofilm composed of Gd2O3:0.05X(3+) (X = Eu, Tb) nanorods still retains the luminescence properties of each monolayer nanofilm. Moreover, the adhesion of the film on the substrate is very strong, which is extremely beneficial for its future applications.
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Affiliation(s)
- Jing Huan
- Department of Materials Science, Fudan University , Shanghai 200433, P. R. China
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Zhou Q, Meng G, Huang Q, Zhu C, Tang H, Qian Y, Chen B, Chen B. Ag-nanoparticles-decorated NiO-nanoflakes grafted Ni-nanorod arrays stuck out of porous AAO as effective SERS substrates. Phys Chem Chem Phys 2014; 16:3686-92. [DOI: 10.1039/c3cp54119c] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Sugawa K, Tanoue Y, Ube T, Yanagida S, Yamamuro T, Kusaka Y, Ushijima H, Akiyama T. Fabrication of dense two-dimensional assemblies over vast areas comprising gold(core)–silver(shell) nanoparticles and their surface-enhanced Raman scattering properties. Photochem Photobiol Sci 2014; 13:82-91. [DOI: 10.1039/c3pp50281c] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Tang X, Cai W, Yang L, Liu J. Highly uniform and optical visualization of SERS substrate for pesticide analysis based on Au nanoparticles grafted on dendritic α-Fe2O3. NANOSCALE 2013; 5:11193-11199. [PMID: 24080958 DOI: 10.1039/c3nr03671e] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Here, Au nanoparticles (NPs) grafted on dendritic α-Fe2O3 (NPGDF) are designed as a highly uniform surface-enhanced Raman scattering (SERS) substrate with a feature of optical visualization by an optical microscope (OM) system and used for in situ detection of pesticide residues that are annually used in agriculture. With this strategy, the dendritic α-Fe2O3 has been synthesized by a hydrothermal method and significantly functionalized by an inductively coupled plasma (ICP) apparatus and then Au NPs were grafted on it densely and uniformly. In addition, the profile of NPGDF can be clearly observed using an OM platform of a Raman spectrometer, and the profile of SERS spectral mapping with NPGDF as substrate almost exactly coincides with the OM image, the electron microscope (EM) image and the elemental mapping of NPGDF, which indicates remarkable uniformity of the NPGDF as SERS substrate, thus ensuring the laser beam focuses on the efficient sites of the substrate under the OM platform. Moreover, NPGDF can be dispersed in the liquor and the NPGDF microparticles can be adsorbed on the target surface. Therefore, it can be used for in situ detection of pesticide residues on tea leaves, fruits etc., with high sensitivity and reproducibility.
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Affiliation(s)
- Xianghu Tang
- Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei 230031, China.
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Hoppmann EP, Yu WW, White IM. Highly sensitive and flexible inkjet printed SERS sensors on paper. Methods 2013; 63:219-24. [PMID: 23872057 DOI: 10.1016/j.ymeth.2013.07.010] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2013] [Revised: 05/11/2013] [Accepted: 07/02/2013] [Indexed: 11/15/2022] Open
Abstract
Surface enhanced Raman spectroscopy (SERS) has the potential to be utilized for the detection of a broad range of chemicals in trace quantities. However, because of the cost and complexity of SERS devices, the technology has been unable to fill the needs of many practical applications, in particular the need for rapid, portable, on-site detection in the field. In this work, we review a new methodology for trace chemical detection using inkjet-printed SERS substrates on paper. The detection performance of the inkjet-printed SERS devices is demonstrated by detecting 1,2-Bis(4-pyridyl)ethylene (BPE) at a concentration as low as 1.8 ppb. We then illustrate the primary advantages of paper SERS substrates as compared to conventional SERS substrates. By leveraging lateral flow concentration, the detection limit of paper SERS substrates can be further improved. Two real-world applications are demonstrated. First, the inkjet-printed SERS substrates are used as "dipsticks" for detecting the fungicide malachite green in water. Then, the flexible paper-based SERS devices are used as swabs to collect and detect trace residues of the fungicide thiram from a surface. We predict that the combination of ultra-low-cost fabrication with the advantages of easy-to-use dipsticks and swabs and the option of lateral flow concentration position ink-jet printed SERS substrates as a technology which will enable the application of SERS in solving critical problems for chemical detection in the field.
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Affiliation(s)
- Eric P Hoppmann
- 2340 Jeong H. Kim Engineering Bldg., Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742, USA.
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Chen J, Qin G, Wang J, Yu J, Shen B, Li S, Ren Y, Zuo L, Shen W, Das B. One-step fabrication of sub-10-nm plasmonic nanogaps for reliable SERS sensing of microorganisms. Biosens Bioelectron 2013; 44:191-7. [DOI: 10.1016/j.bios.2013.01.038] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2012] [Revised: 12/31/2012] [Accepted: 01/21/2013] [Indexed: 12/23/2022]
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Zhang L, Jiang C, Zhang Z. Graphene oxide embedded sandwich nanostructures for enhanced Raman readout and their applications in pesticide monitoring. NANOSCALE 2013; 5:3773-3779. [PMID: 23535912 DOI: 10.1039/c3nr00631j] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Analytical techniques based on surface-enhanced Raman scattering (SERS) suffer from a lack of reproducibility and reliability, thus hampering their practical applications. Herein, we have developed a SERS-active substrate based on a graphene oxide embedded sandwich nanostructure for ultrasensitive Raman signal readout. By using this novel Au@Ag NPs/GO/Au@Ag NPs sandwich nanostructure as a SERS substrate, the Raman signals of analytes were dramatically enhanced due to having plenty of hot spots on their surfaces and the unique structure of the graphene oxide sheets. These features make the sandwich nanostructured film an ideal SERS substrate to improve the sensitivity, reproducibility and reliability of the Raman readout. The sandwich nanostructure film can be applied to detect rhodamine-6G (R6G) with an enhancement factor (EF) of ∼7.0 × 10(7) and the pesticide thiram in commercial grape juice with a detection limit of as low as 0.1 μM (0.03 ppm), which is much lower than the maximal residue limit (MRL) of 7 ppm in fruit prescribed by the U.S. Environmental Protection Agency (EPA). The GO embedded sandwich nanostructure also has the ability to selectively detect dithiocarbamate compounds over other types of agricultural chemical. Furthermore, spiked tests show that the sandwich nanostructure can be used to monitor thiram in natural lake water and commercial grape juice without further treatment. In addition, the GO enhanced Raman spectroscopic technique offers potential practical applications for the on-site monitoring and assessment of pesticide residues in agricultural products and environments.
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Affiliation(s)
- Lulu Zhang
- Department of Chemistry, University of Science & Technology of China, Hefei, Anhui 230026, China
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