1
|
V Grayli S, Kamal S, Leach GW. High performance, single crystal gold bowtie nanoantennas fabricated via epitaxial electroless deposition. Sci Rep 2023; 13:12745. [PMID: 37550311 PMCID: PMC10406868 DOI: 10.1038/s41598-023-38154-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2023] [Accepted: 07/04/2023] [Indexed: 08/09/2023] Open
Abstract
Material quality plays a critical role in the performance of nanometer-scale plasmonic structures and represents a significant hurdle to large-scale device integration. Progress has been hindered by the challenges of realizing scalable, high quality, ultrasmooth metal deposition strategies, and by the poor pattern transfer and device fabrication yields characteristic of most metal deposition approaches which yield polycrystalline metal structure. Here we highlight a novel and scalable electrochemical method to deposit ultrasmooth, single-crystal (100) gold and to fabricate a series of bowtie nanoantennas through subtractive nanopatterning. We investigate some of the less well-explored design and performance characteristics of these single-crystal nanoantennas in relation to their polycrystalline counterparts, including pattern transfer and device yield, polarization response, gap-field magnitude, and the ability to model accurately the antenna local field response. Our results underscore the performance advantages of single-crystal nanoscale plasmonic materials and provide insight into their use for large-scale manufacturing of plasmon-based devices. We anticipate that this approach will be broadly useful in applications where local near-fields can enhance light-matter interactions, including for the fabrication of optical sensors, photocatalytic structures, hot carrier-based devices, and nanostructured noble metal architectures targeting nano-attophysics.
Collapse
Affiliation(s)
- Sasan V Grayli
- Institute for Quantum Computing, University of Waterloo, 200 University Ave W., Waterloo, ON, N2L 3G1, Canada
| | - Saeid Kamal
- Laboratory for Advanced Spectroscopy and Imaging Research, Simon Fraser University, 8888 University Dr, Burnaby, BC, V5A 1S6, Canada
| | - Gary W Leach
- Laboratory for Advanced Spectroscopy and Imaging Research, and 4D LABS, Department of Chemistry, Simon Fraser University, 8888 University Dr, Burnaby, BC, V5A 1S6, Canada.
| |
Collapse
|
2
|
Chu Q, Wang W, Guo S, Park E, Jin S, Park Y, Chen L, Liu Y, Jung YM. Interface Design of 3D Flower-like Ag@ZnSe Composites: SERS and Photocatalytic Performance. ACS APPLIED MATERIALS & INTERFACES 2023; 15:11304-11313. [PMID: 36790371 DOI: 10.1021/acsami.2c21833] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
In this work, we cosputtered Ag and ZnSe on a polystyrene template to form a three-dimensional (3D) Ag@ZnSe (x) structure. The 3D surface morphology and material composition that provided abundant "hot spots" were controlled by adjusting the sputtering power of the ZnSe, which was confirmed by finite-difference time-domain (FDTD) simulation. The introduction of ZnSe into the noble metal Ag also introduced a charge-transfer (CT) effect into the system, and the CT path was proven with the two-dimensional correlation spectroscopy (2D-COS)-surface-enhanced Raman scattering (SERS) technique. In addition, the substrate exhibited excellent catalytic activity due to the CT effect. The catalyzed degradation of malachite green (MG) was due to the CT effect in the system, and the catalytic process was successfully monitored by in situ SERS. Most importantly, the catalytic degradation by Ag@ZnSe (x) with different parameters was proportional to the degree of CT (ρCT). The SERS and catalytic mechanisms were analyzed in depth with the 2D-COS-SERS technique, which was also useful in verifying the CT process. The catalytic sites for MG were successfully monitored with the 2D-COS-SERS technique. This study provides a reference for studies of the synergistic effects of the electromagnetic mechanism and CT, as well as a new perspective on photocatalysis with dye molecules and monitoring of the catalytic processes.
Collapse
Affiliation(s)
- Qi Chu
- Key Laboratory of Preparation and Applications of Environmental Friendly Materials, Ministry of Education, Jilin Normal University, Changchun 130103, P.R. China
| | - Wei Wang
- Key Laboratory of Preparation and Applications of Environmental Friendly Materials, Ministry of Education, Jilin Normal University, Changchun 130103, P.R. China
| | - Shuang Guo
- Department of Chemistry, Institute for Molecular Science and Fusion Technology, Kangwon National University, Chuncheon 24341, Korea
| | - Eungyeong Park
- Department of Chemistry, Institute for Molecular Science and Fusion Technology, Kangwon National University, Chuncheon 24341, Korea
| | - Sila Jin
- Kangwon Radiation Convergence Research Support Center, Kangwon National University, Chuncheon 24341, Korea
| | - Yeonju Park
- Kangwon Radiation Convergence Research Support Center, Kangwon National University, Chuncheon 24341, Korea
| | - Lei Chen
- Key Laboratory of Preparation and Applications of Environmental Friendly Materials, Ministry of Education, Jilin Normal University, Changchun 130103, P.R. China
| | - Yucun Liu
- Key Laboratory of Preparation and Applications of Environmental Friendly Materials, Ministry of Education, Jilin Normal University, Changchun 130103, P.R. China
| | - Young Mee Jung
- Department of Chemistry, Institute for Molecular Science and Fusion Technology, Kangwon National University, Chuncheon 24341, Korea
- Kangwon Radiation Convergence Research Support Center, Kangwon National University, Chuncheon 24341, Korea
| |
Collapse
|
3
|
Azimi S, Docoslis A. Recent Advances in the Use of Surface-Enhanced Raman Scattering for Illicit Drug Detection. SENSORS 2022; 22:s22103877. [PMID: 35632286 PMCID: PMC9143835 DOI: 10.3390/s22103877] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Revised: 05/10/2022] [Accepted: 05/16/2022] [Indexed: 02/07/2023]
Abstract
The rapid increase in illicit drug use and its adverse health effects and socio-economic consequences have reached alarming proportions in recent years. Surface-enhanced Raman scattering (SERS) has emerged as a highly sensitive analytical tool for the detection of low dosages of drugs in liquid and solid samples. In the present article, we review the state-of-the-art use of SERS for chemical analysis of illicit drugs in aqueous and complex biological samples, including saliva, urine, and blood. We also include a review of the types of SERS substrates used for this purpose, pointing out recent advancements in substrate fabrication towards quantitative and qualitative detection of illicit drugs. Finally, we conclude by providing our perspective on the field of SERS-based drug detection, including presently faced challenges. Overall, our review provides evidence of the strong potential of SERS to establish itself as both a laboratory and in situ analytical method for fast and sensitive drug detection and identification.
Collapse
|
4
|
Yilmaz H, Yilmaz D, Taskin IC, Culha M. Pharmaceutical applications of a nanospectroscopic technique: Surface-enhanced Raman spectroscopy. Adv Drug Deliv Rev 2022; 184:114184. [PMID: 35306126 DOI: 10.1016/j.addr.2022.114184] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2021] [Revised: 02/12/2022] [Accepted: 03/06/2022] [Indexed: 12/13/2022]
Abstract
Surface-enhanced Raman spectroscopy (SERS) is a very sensitive technique offering unique opportunities for detection and identification of molecules and molecular structures at extremely low concentrations even in complex sample matrixes. Since a nanostructured noble metal surface is required for the enhancement of Raman scattering, the acquired spectral information naturally originates from nanometer size domains making it a nanospectroscopic technique by breaking the diffraction limit of light. In this review, first Raman spectroscopy, its comparison to other related techniques, its modes and instrumentation are briefly introduced. Then, the SERS mechanism, substrates and the parameters influencing a SERS experiment are discussed. Finally, its applications in pharmaceuticals including drug discovery, drug metabolism, multifunctional chemo-photothermal-therapy-delivery-release-imaging, drug stability and drug/metabolite detection in complex biological samples are summarized and elaborated.
Collapse
|
5
|
Mathioudakis GN, Soto Beobide A, Anastasiadis SH, Voyiatzis GA. Surface enhanced Raman scattering of brilliant green: Packing density and stabilizing effect of the cationic surfactant CTAB on the “hotspot” spacing. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2020.125912] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
6
|
Facile synthesis of ultra-large, single-crystal Ag nanosheet-assembled films at chloroform-water interface. J SOLID STATE CHEM 2019. [DOI: 10.1016/j.jssc.2019.120912] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
|
7
|
Si P, Chen L, Yu L, Zhao B. Dual Colorimetric and Conductometric Responses of Silver-Decorated Polypyrrole Nanowires for Sensing Organic Solvents of Varied Polarities. ACS APPLIED MATERIALS & INTERFACES 2018; 10:29227-29232. [PMID: 30124287 DOI: 10.1021/acsami.8b09586] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We report on the discovery of an interesting dual colorimetric and conductometric response of synthesized water-based silver-decorated polypyrrole (Ag/PPy) nanowire to organic solvents, and the possible fabrication of a volatile organic compounds (VOCs) sensor based on the stimuli-responsive Ag/PPy nanocomposites. The dual-responsive nature of this material allows for a straightforward way to differentiate various VOCs within a broad polarity range by noncontact optical means via color transition, but also can provide highly accurate quantitative identification of each VOC by electronic detection.
Collapse
Affiliation(s)
- Pengxiang Si
- Department of Chemical Engineering, Waterloo Institute of Nanotechnology, Institute for Polymer Research , University of Waterloo , Waterloo , Ontario N2L 3G1 , Canada
| | - Li Chen
- Department of Chemical Engineering, Waterloo Institute of Nanotechnology, Institute for Polymer Research , University of Waterloo , Waterloo , Ontario N2L 3G1 , Canada
| | - Li Yu
- Department of Chemical Engineering, Waterloo Institute of Nanotechnology, Institute for Polymer Research , University of Waterloo , Waterloo , Ontario N2L 3G1 , Canada
| | - Boxin Zhao
- Department of Chemical Engineering, Waterloo Institute of Nanotechnology, Institute for Polymer Research , University of Waterloo , Waterloo , Ontario N2L 3G1 , Canada
| |
Collapse
|
8
|
Kahraman M, Wachsmann-Hogiu S. Label-free and direct protein detection on 3D plasmonic nanovoid structures using surface-enhanced Raman scattering. Anal Chim Acta 2014; 856:74-81. [PMID: 25542360 DOI: 10.1016/j.aca.2014.11.019] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2014] [Accepted: 11/15/2014] [Indexed: 11/18/2022]
Abstract
In this paper we use surface-enhanced Raman spectroscopy (SERS) on 3D metallic structures for label-free detection and characterization of proteins of interest at low concentrations. The substrates are prepared via nanopatterning with latex nano/microparticles and Cr and Ag sputtering, yielding stable, tunable, and mechanically flexible plasmonic structures. The nanovoids generate a SERS signal of the proteins of interest that is background free and independent of the protein charge. Concentrations as low as 0.05 μg mL(-1) could be detected for 4 different proteins. The proteins also exhibit significantly different SERS spectra on these substrates, which is an important feature for future label-free direct detection schemes.
Collapse
Affiliation(s)
- Mehmet Kahraman
- Department of Chemistry, Faculty of Arts and Sciences, University of Gaziantep, 27310 Sehitkamil, Gaziantep, Turkey.
| | - Sebastian Wachsmann-Hogiu
- Center for Biophotonics, University of California Davis, Sacramento, CA 95817, USA; Department of Pathology and Laboratory Medicine, University of California Davis, Sacramento, CA 95817, USA.
| |
Collapse
|
9
|
A filter-like AuNPs@MS SERS substrate for Staphylococcus aureus detection. Biosens Bioelectron 2014; 53:519-27. [DOI: 10.1016/j.bios.2013.10.017] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2013] [Revised: 10/08/2013] [Accepted: 10/09/2013] [Indexed: 12/21/2022]
|
10
|
Lin CC, Chang CW. AuNPs@mesoSiO2 composites for SERS detection of DTNB molecule. Biosens Bioelectron 2014; 51:297-303. [DOI: 10.1016/j.bios.2013.07.065] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2013] [Revised: 07/23/2013] [Accepted: 07/31/2013] [Indexed: 10/26/2022]
|
11
|
Abramczyk H, Brozek-Pluska B. Raman imaging in biochemical and biomedical applications. Diagnosis and treatment of breast cancer. Chem Rev 2013; 113:5766-81. [PMID: 23697873 DOI: 10.1021/cr300147r] [Citation(s) in RCA: 141] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Halina Abramczyk
- Laboratory of Laser Molecular Spectroscopy, Institute of Applied Radiation Chemistry, Lodz University of Technology , Wroblewskiego 15, 93-590 Lodz, Poland
| | | |
Collapse
|
12
|
Avci E, Culha M. Influence of droplet drying configuration on surface-enhanced Raman scattering performance. RSC Adv 2013. [DOI: 10.1039/c3ra42838a] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
|
13
|
Kahraman M, Balz BN, Wachsmann-Hogiu S. Hydrophobicity-driven self-assembly of protein and silver nanoparticles for protein detection using surface-enhanced Raman scattering. Analyst 2013; 138:2906-13. [DOI: 10.1039/c3an00025g] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
14
|
Ke X, Lu B, Hao J, Zhang J, Qiao H, Zhang Z, Xing C, Yang W, Zhang B, Tang J. Facile Fabrication of SERS Arrays through Galvanic Replacement of Silver onto Electrochemically Deposited Copper Micropatterns. Chemphyschem 2012; 13:3786-9. [DOI: 10.1002/cphc.201200525] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2012] [Revised: 09/10/2012] [Indexed: 11/12/2022]
|
15
|
Keskin S, Çulha M. Label-free detection of proteins from dried-suspended droplets using surface enhanced Raman scattering. Analyst 2012; 137:2651-7. [DOI: 10.1039/c2an16296b] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
16
|
Surface-Enhanced Raman Scattering as an Emerging Characterization and Detection Technique. JOURNAL OF NANOTECHNOLOGY 2012. [DOI: 10.1155/2012/971380] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
While surface-enhanced Raman spectroscopy (SERS) has been attracting a continuously increasing interest of scientific community since its discovery, it has enjoyed a particularly rapid growth in the last decade. Most notable recent advances in SERS include novel technological approaches to SERS substrates and innovative applications of SERS in medicine and molecular biology. While a number of excellent reviews devoted to SERS appeared in the literature over the last two decades, we will focus this paper more specifically on several promising trends that have been highlighted less frequently. In particular, we will briefly overview strategies in designing and fabricating SERS substrates using deterministic patterning and then cover most recent biological applications of SERS.
Collapse
|
17
|
Qiu H, Zhang Z, Huang X, Qu Y. Dealloying Ag-Al Alloy to Prepare Nanoporous Silver as a Substrate for Surface-Enhanced Raman Scattering: Effects of Structural Evolution and Surface Modification. Chemphyschem 2011; 12:2118-23. [DOI: 10.1002/cphc.201100205] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2011] [Indexed: 11/10/2022]
|
18
|
Keseroğlu K, Culha M. Assembly of nanoparticles at the contact line of a drying droplet under the influence of a dipped tip. J Colloid Interface Sci 2011; 360:8-14. [PMID: 21546030 DOI: 10.1016/j.jcis.2011.04.007] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2010] [Revised: 03/30/2011] [Accepted: 04/07/2011] [Indexed: 11/25/2022]
Abstract
The manipulation of colloidal nanoparticles (NPs) in a drying droplet has critical importance not only for several industrial applications but also their assembly into patterns on surfaces. The influence of a tip with hydrophilic or hydrophobic surfaces dipped into a drying droplet on hydrophilic or hydrophobic surfaces on the behavior of 98 nm latex NPs was investigated. The formation of concentric rings on hydrophilic glass surfaces regardless of the surface chemistry of the dipped tip was observed. On the other hand, no pattern formation on hydrophobic surfaces was observed with the insertion of the tip. With a hydrophilic tip, the concentric rings were formed due to stick-slip motion of the solvent contact line resulting from competition between pinning and capillary forces while the capillary effect was not effective until the surface of the tip was changed by adherent NPs making the tip surface available for water adherence with a hydrophobic tip, which results in the pulling of droplet towards the tip. It is also found that the tip thickness and suspension concentration significantly influences the formation of concentric rings on surfaces. This simple procedure can be used to influence the distribution or assembly of NPs in the droplet area.
Collapse
Affiliation(s)
- Kemal Keseroğlu
- Department of Genetics and Bioengineering, Yeditepe University, Ataşehir, Istanbul, Turkey
| | | |
Collapse
|
19
|
Yuan C, Liu R, Wang S, Han G, Han MY, Jiang C, Zhang Z. Single clusters of self-assembled silver nanoparticles for surface-enhanced Raman scattering sensing of a dithiocarbamate fungicide. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm12919h] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
20
|
Wang J, Duan G, Liu G, Li Y, Dai Z, Zhang H, Cai W. Gold quasi rod-shaped nanoparticle-built hierarchically micro/nanostructured pore array via clean electrodeposition on a colloidal monolayer and its structurally enhanced SERS performance. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm10773a] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
|
21
|
Xu C, Li Y, Tian F, Ding Y. Dealloying to Nanoporous Silver and Its Implementation as a Template Material for Construction of Nanotubular Mesoporous Bimetallic Nanostructures. Chemphyschem 2010; 11:3320-8. [DOI: 10.1002/cphc.201000313] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
22
|
Abdullin TI, Bondar OV, Shtyrlin YG, Kahraman M, Culha M. Pluronic block copolymer-mediated interactions of organic compounds with noble metal nanoparticles for SERS analysis. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:5153-5159. [PMID: 20350012 DOI: 10.1021/la9036309] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The composite silver and gold nanoparticles (AgNPs and AuNPs) coated with nonionic amphiphilic block copolymers (Pluronics L121, F68, or F127) are prepared by their adsorption under critical micelle concentrations. It is found that Pluronics bind to the surface of metal NPs as a very thin film by the hydrophobic association through poly(propylene oxide) block of the copolymers. The modification increases the colloidal stability of NPs with increasing hydrophilic-lipophilic balance of Pluronics in the order of L121, F127, and F68. In order to investigate the potentials of polymer coated noble metal NPs as surface-enhanced Raman spectroscopy (SERS) probes, fluorescent dyes and doxorubicin are used as model compounds. It is found that Pluronic component promotes the adsorption of these compounds on the composite NPs resulting in a considerable increase of Raman signal. This effect is attributed to increased concentration of the analyte molecules on the composite surface due to the hydrophobic and charge-charge interactions between the analytes and the Pluronic coat, and the stabilization of NPs by poly(ethylene oxide) blocks. The copolymer coated AgNPs show higher SERS activity than the counterparts prepared with AuNPs. Among the prepared composites, the AgNPs modified with Pluronic F127 containing extended poly(propylene oxide) and poly(ethylene oxide) blocks exhibit maximal Raman activity using rhodamine 6G (Rh6G) with a EF of 9.04 x 10(6). The results show that the developed Pluronic-based SERS probes can be used for sensitive and selective analysis of organic analytes.
Collapse
Affiliation(s)
- Timur I Abdullin
- Faculty of Biology and Soil Sciences, Kazan State University, Kazan, Tatarstan, Russia.
| | | | | | | | | |
Collapse
|
23
|
Ozdemir T, Sandal D, Culha M, Sanyal A, Atay NZ, Bucak S. Assembly of magnetic nanoparticles into higher structures on patterned magnetic beads under the influence of magnetic field. NANOTECHNOLOGY 2010; 21:125603. [PMID: 20203359 DOI: 10.1088/0957-4484/21/12/125603] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The self-assembly of nanoparticles into higher organizations in a controlled manner has critical importance for the utility of the unique properties of nanoparticles. The behavior of magnetic Fe(3)O(4) nanoparticles (MNPs) with an average size of 6 nm under an enhanced magnetic force is reported. Upon evaporation of the solvent where the MNPs are suspended, formation of unique micrometer-sized structures is achieved only when there is a patterned surface constructed from sub-micrometer size magnetic beads in between the applied magnetic field and the MNPs. The preliminary results indicate that the combined effect of magnetic field and evaporation rate might help the control of nanoparticle behavior on surfaces and interfaces in constructing higher structures.
Collapse
Affiliation(s)
- Tugce Ozdemir
- Department of Chemical Engineering, Yeditepe University, Istanbul, Turkey
| | | | | | | | | | | |
Collapse
|
24
|
Galopin E, Barbillat J, Coffinier Y, Szunerits S, Patriarche G, Boukherroub R. Silicon nanowires coated with silver nanostructures as ultrasensitive interfaces for surface-enhanced Raman spectroscopy. ACS APPLIED MATERIALS & INTERFACES 2009; 1:1396-1403. [PMID: 20355941 DOI: 10.1021/am900087s] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Silver nanoparticles (Ag NPs) were chemically deposited on silicon nanowires (SiNWs), prepared using the vapor-liquid-solid (VLS) growth mechanism, using an in situ electroless metal deposition technique. The resulting SiNWs/Ag NPs composite interfaces showed large Raman scattering enhancement for rhodamine 6G (R6G) with a detection limit of 10(-14) M and an enhancement factor of 2.3 x 10(8). This large enhancement factor was attributed to the presence of "hot" spots on the SiNWs/Ag NPs substrate.
Collapse
Affiliation(s)
- Elisabeth Galopin
- Institut de Recherche Interdisciplinaire (IRI, USR-CNRS 3078) and Institut d'Electronique, de Microelectronique et de Nanotechnologie (IEMN, UMR-CNRS 8520), Cite Scientifique, Avenue Poincare - BP 60069, 59652 Villeneuve d'Ascq, France
| | | | | | | | | | | |
Collapse
|
25
|
Misra AK, Sharma SK, Kamemoto L, Zinin PV, Yu Q, Hu N, Melnick L. Novel micro-cavity substrates for improving the Raman signal from submicrometer size materials. APPLIED SPECTROSCOPY 2009; 63:373-377. [PMID: 19281655 DOI: 10.1366/000370209787598988] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
A novel and simple method for improving the detection limit of conventional Raman spectra using a micro-Raman system and picoliter volumes is presented. A micro-cavity in a reflecting metal substrate uses various mechanisms that collectively improve the entire Raman spectrum from the sample. A micro-cavity with a radius of several micrometers acts as a very effective device that provides multiple excitation of the sample with the laser and couples the forward-scattered Raman photons toward the collection optics in the back-scattered Raman geometry. One of the important features of the micro-cavity substrate is that it enhances the entire Raman spectrum of the molecules under investigation and maintains the relative intensity ratios of the various Raman bands. This feature of maintaining the overall integrity of the Raman features during signal enhancement makes the micro-cavity substrate ideal for forensic science applications for chemical detection of residual traces and other applications requiring low sample concentrations. The spectra measured in these cavities are also observed to be highly reproducible and reliable. A simple method for fabricating micro-cavity substrates with precise sizes and shapes is described. It is further shown that micro-cavities coated with nanofilms of gold take advantage of both surface-enhanced Raman scattering (SERS) and micro-cavity methods and also significantly improve sample detection limits.
Collapse
Affiliation(s)
- Anupam K Misra
- University of Hawaii, Hawaii Institute for Geophysics and Planetology, 1680 East-west Rd., POST #602, Honolulu, Hawaii 96822, USA
| | | | | | | | | | | | | |
Collapse
|
26
|
Kahraman M, Aydin Ö, Çulha M. Size Effect of 3D Aggregates Assembled from Silver Nanoparticles on Surface-Enhanced Raman Scattering. Chemphyschem 2009; 10:537-42. [DOI: 10.1002/cphc.200800740] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
27
|
Yang LB, Chen GY, Wang J, Wang TT, Li MQ, Liu JH. Sunlight-induced formation of silver-gold bimetallic nanostructures on DNA template for highly active surface enhanced Raman scattering substrates and application in TNT/tumor marker detection. ACTA ACUST UNITED AC 2009. [DOI: 10.1039/b909600k] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|