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Ke X, Chen J, Chang L, Zhou Z, Zhang W. Casting liquid PDMS on self-assembled bilayer polystyrene nanospheres to prepare a SERS substrate with two layers of nanopits for detection of p-nitrophenol. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2023; 15:4582-4590. [PMID: 37655547 DOI: 10.1039/d3ay00628j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
Abstract
p-Nitrophenol (PNP) is widely used in pesticides, pharmaceuticals, and dyestuffs. It is vital to detect trace PNP in the environment, because it poses significant environmental hazards due to its high toxicity. In this paper, a new method was reported for preparing a SERS substrate with excellent SERS activity by combining self-assembly techniques and flexible materials. First, the three-dimensional (3D) polystyrene (PS) photonic crystal (PC) structural master was fabricated by stacking two layers of self-assembled PS nanospheres with different diameters. Polydimethylsiloxane (PDMS) with a complementary structure to the master was obtained by casting, curing and peeling off. Finally, the PDMS-Ag substrate was fabricated by sputtering a thin Ag layer on the PDMS structure. The enhancement factor (EF) of the PDMS-Ag substrate was calculated to be 2.90 × 109 by using 4-amino thiophenol (ATP) as the probe molecule, and the limit of detection (LOD) for ATP can reach 10-11 M. And the RSD of the SERS intensity for the peak at 1078 cm-1 on the PDMS-Ag substrates from batch to batch was within 2%, indicating the high reproducibility of the as-prepared substrate. The quantitative analysis of PNP was achieved with a LOD of 10-8 M. Therefore, the PDMS-Ag substrate exhibits high sensitivity and reproducibility, and it can detect PNP in trace amounts, with great potential for detecting other contaminants.
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Affiliation(s)
- Xiurui Ke
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
- Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, P. R. China.
| | - Jinran Chen
- Chongqing Jiaotong University, Chongqing, 400074, China
- Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, P. R. China.
| | - Lin Chang
- Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, P. R. China.
| | - Zhou Zhou
- The University of Manchester, Department of Materials, Oxford Road, Manchester M13 9PL, UK
| | - Wei Zhang
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
- Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, P. R. China.
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Borah R, Ag KR, Minja AC, Verbruggen SW. A Review on Self-Assembly of Colloidal Nanoparticles into Clusters, Patterns, and Films: Emerging Synthesis Techniques and Applications. SMALL METHODS 2023; 7:e2201536. [PMID: 36856157 DOI: 10.1002/smtd.202201536] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2022] [Revised: 01/25/2023] [Indexed: 06/09/2023]
Abstract
The colloidal synthesis of functional nanoparticles has gained tremendous scientific attention in the last decades. In parallel to these advancements, another rapidly growing area is the self-assembly or self-organization of these colloidal nanoparticles. First, the organization of nanoparticles into ordered structures is important for obtaining functional interfaces that extend or even amplify the intrinsic properties of the constituting nanoparticles at a larger scale. The synthesis of large-scale interfaces using complex or intricately designed nanostructures as building blocks, requires highly controllable self-assembly techniques down to the nanoscale. In certain cases, for example, when dealing with plasmonic nanoparticles, the assembly of the nanoparticles further enhances their properties by coupling phenomena. In other cases, the process of self-assembly itself is useful in the final application such as in sensing and drug delivery, amongst others. In view of the growing importance of this field, this review provides a comprehensive overview of the recent developments in the field of nanoparticle self-assembly and their applications. For clarity, the self-assembled nanostructures are classified into two broad categories: finite clusters/patterns, and infinite films. Different state-of-the-art techniques to obtain these nanostructures are discussed in detail, before discussing the applications where the self-assembly significantly enhances the performance of the process.
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Affiliation(s)
- Rituraj Borah
- Sustainable Energy, Air & Water Technology (DuEL), Department of Bioscience Engineering, University of Antwerp, Groenenborgerlaan 171, Antwerp, 2020, Belgium
- NANOlab Center of Excellence, University of Antwerp, Groenenborgerlaan 171, Antwerp, 2020, Belgium
| | - Karthick Raj Ag
- Sustainable Energy, Air & Water Technology (DuEL), Department of Bioscience Engineering, University of Antwerp, Groenenborgerlaan 171, Antwerp, 2020, Belgium
- NANOlab Center of Excellence, University of Antwerp, Groenenborgerlaan 171, Antwerp, 2020, Belgium
| | - Antony Charles Minja
- Sustainable Energy, Air & Water Technology (DuEL), Department of Bioscience Engineering, University of Antwerp, Groenenborgerlaan 171, Antwerp, 2020, Belgium
- NANOlab Center of Excellence, University of Antwerp, Groenenborgerlaan 171, Antwerp, 2020, Belgium
| | - Sammy W Verbruggen
- Sustainable Energy, Air & Water Technology (DuEL), Department of Bioscience Engineering, University of Antwerp, Groenenborgerlaan 171, Antwerp, 2020, Belgium
- NANOlab Center of Excellence, University of Antwerp, Groenenborgerlaan 171, Antwerp, 2020, Belgium
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Li G, Niu P, Ge S, Cao D, Sun A. SERS Based Lateral Flow Assay for Rapid and Ultrasensitive Quantification of Dual Laryngeal Squamous Cell Carcinoma-Related miRNA Biomarkers in Human Serum Using Pd-Au Core-Shell Nanorods and Catalytic Hairpin Assembly. Front Mol Biosci 2022; 8:813007. [PMID: 35223986 PMCID: PMC8878268 DOI: 10.3389/fmolb.2021.813007] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Accepted: 12/20/2021] [Indexed: 11/13/2022] Open
Abstract
Non-invasive early diagnosis is of great significant in disease pathologic development and subsequent medical treatments, and microRNA (miRNA) detection has attracted critical attention in early cancer screening and diagnosis. However, it was still a challenge to report an accurate and sensitive method for the detection of miRNA during cancer development, especially in the presence of its analogs that produce intense background noise. Herein, we developed a surface-enhanced Raman scattering (SERS)–based lateral flow assay (LFA) biosensor, assisted with catalytic hairpin assembly (CHA) amplification strategy, for the dynamic monitoring of miR-106b and miR-196b, associated with laryngeal squamous cell carcinoma (LSCC). In the presence of target miRNAs, two hairpin DNAs could self-assemble into double-stranded DNA, exposing the biotin molecules modified on the surface of palladium (Pd)–gold (Au) core–shell nanorods (Pd-AuNRs). Then, the biotin molecules could be captured by the streptavidin (SA), which was fixed on the test lines (T1 line and T2 line) beforehand. The core–shell spatial structures and aggregation Pd-AuNRs generated abundant active “hot spots” on the T line, significantly amplifying the SERS signals. Using this strategy, the limits of detections were low to aM level, and the selectivity, reproducibility, and uniformity of the proposed SERS-LFA biosensor were satisfactory. Finally, this rapid analysis strategy was successfully applied to quantitatively detect the target miRNAs in clinical serum obtained from healthy subjects and patients with LSCC at different stages. The results were consistent with the quantitative real-time PCR (qRT-PCR). Thus, the CHA-assisted SERS-LFA biosensor would become a promising alternative tool for miRNAs detection, which showed a tremendous clinical application prospect in diagnosing LSCC.
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Affiliation(s)
- Guang Li
- Department of Otorhinolaryngology-Head and Neck Surgery, The Affiliated Hospital of Yangzhou University, Yangzhou University, Yangzhou, China
| | - Ping Niu
- Departments of Otolaryngology, The Affiliated Hospital of Shandong First Medical University, Qingzhou People’s Hospital, Qingzhou, China
| | - Shengjie Ge
- Institute of Translational Medicine, Medical College, Yangzhou University, Yangzhou, China
| | - Dawei Cao
- College of Mathematics and Computer Science, Zhejiang Normal University, Jinhua, China
| | - Aidong Sun
- Department of Otorhinolaryngology-Head and Neck Surgery, The Affiliated Hospital of Yangzhou University, Yangzhou University, Yangzhou, China
- *Correspondence: Aidong Sun,
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Ye Z, Li C, Chen Q, Xu Y, Bell SEJ. Self-assembly of colloidal nanoparticles into 2D arrays at water-oil interfaces: rational construction of stable SERS substrates with accessible enhancing surfaces and tailored plasmonic response. NANOSCALE 2021; 13:5937-5953. [PMID: 33650605 DOI: 10.1039/d0nr08803j] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Self-assembly at water-oil interfaces has been shown to be a cheap, convenient and efficient route to obtain densely packed layers of plasmonic nanoparticles which have small interparticle distances. This creates highly plasmonically active materials that can be used to give strong SERS enhancement and whose structure means that they are well suited to creating the highly stable, reproducible and uniform substrates that are needed to allow routine and accurate quantitative SERS measurements. A variety of methods have been developed to induce nanoparticle self-assembly at water-oil interfaces, fine tune the surface chemistry and adjust the position of the nanoparticles at the interface but only some of these are compatible with eventual use in SERS, where it is important that target molecules can access the active surface unimpeded. Similarly, it is useful to transform liquid plasmonic arrays into easy-to-handle free-standing solid films but these can only be used as solid SERS substrates if the process leaves the surface nanoparticles exposed. Here, we review the progress made in these research areas and discuss how these developments may lead towards achieving rational construction of tailored SERS substrates for sensitive and quantitative SERS analysis.
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Affiliation(s)
- Ziwei Ye
- School of Chemistry and Chemical Engineering, Queen's University Belfast, University Road, Belfast, BT7 1NN, UK.
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Jabłońska A, Jaworska A, Kasztelan M, Berbeć S, Pałys B. Graphene and Graphene Oxide Applications for SERS Sensing and Imaging. Curr Med Chem 2020; 26:6878-6895. [PMID: 30289065 DOI: 10.2174/0929867325666181004152247] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2018] [Revised: 09/17/2018] [Accepted: 09/18/2018] [Indexed: 11/22/2022]
Abstract
Surface Enhanced Raman Spectroscopy (SERS) has a long history as an ultrasensitive platform for the detection of biological species from small aromatic molecules to complex biological systems as circulating tumor cells. Thanks to unique properties of graphene, the range of SERS applications has largely expanded. Graphene is efficient fluorescence quencher improving quality of Raman spectra. It contributes also to the SERS enhancement factor through the chemical mechanism. In turn, the chemical flexibility of Reduced Graphene Oxide (RGO) enables tunable adsorption of molecules or cells on SERS active surfaces. Graphene oxide composites with SERS active nanoparticles have been also applied for Raman imaging of cells. This review presents a survey of SERS assays employing graphene or RGO emphasizing the improvement of SERS enhancement brought by graphene or RGO. The structure and physical properties of graphene and RGO will be discussed too.
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Affiliation(s)
- Anna Jabłońska
- Chemical and Biological Research Centre, University of Warsaw, Zwirki i Wigury str. 101, Warsaw, PL-02- 089, Poland
| | - Aleksandra Jaworska
- Faculty of Chemistry, University of Warsaw, Pasteur str. 1, Warsaw, PL-02-093, Poland
| | - Mateusz Kasztelan
- Faculty of Chemistry, University of Warsaw, Pasteur str. 1, Warsaw, PL-02-093, Poland
| | - Sylwia Berbeć
- Faculty of Chemistry, University of Warsaw, Pasteur str. 1, Warsaw, PL-02-093, Poland
| | - Barbara Pałys
- Chemical and Biological Research Centre, University of Warsaw, Zwirki i Wigury str. 101, Warsaw, PL-02- 089, Poland
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Teng Y, Ren Z, Zhang Y, Wang Z, Pan Z, Shao K, She Y. Fabrication of liquid–liquid self-assembled Ag arrays on disposable screen-printed electrodes and their application in the identification and analysis of the adsorption behavior of organic carboxylates through in situ electrochemical surface-enhanced Raman scattering. NEW J CHEM 2020. [DOI: 10.1039/c9nj06000f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
A disposable Ag array@screen-printed electrode (SPE) was fabricated for the identification and analysis of the adsorption behavior of organic carboxylates in in situ electrochemical surface-enhanced Raman scattering (EC-SERS).
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Affiliation(s)
- Yuanjie Teng
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology
- College of Chemical Engineering
- Zhejiang University of Technology
- Hangzhou 310032
- China
| | - Zeyu Ren
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology
- College of Chemical Engineering
- Zhejiang University of Technology
- Hangzhou 310032
- China
| | - Yuchao Zhang
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology
- College of Chemical Engineering
- Zhejiang University of Technology
- Hangzhou 310032
- China
| | - Zhenni Wang
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology
- College of Chemical Engineering
- Zhejiang University of Technology
- Hangzhou 310032
- China
| | - Zaifa Pan
- College of Chemical Engineering
- Zhejiang University of Technology
- Hangzhou 310032
- China
| | - Kang Shao
- College of Chemical Engineering
- Zhejiang University of Technology
- Hangzhou 310032
- China
| | - Yuanbin She
- College of Chemical Engineering
- Zhejiang University of Technology
- Hangzhou 310032
- China
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Zou B, Niu C, Ma M, Zhao L, Wang Y. Magnetic Assembly Route to Construct Reproducible and Recyclable SERS Substrate. NANOSCALE RESEARCH LETTERS 2019; 14:369. [PMID: 31807938 PMCID: PMC6895331 DOI: 10.1186/s11671-019-3184-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/03/2019] [Accepted: 10/15/2019] [Indexed: 06/10/2023]
Abstract
The fabrication of a uniform array film through assembly of colloidal building blocks is of practical interest for the integrated individual and collective functions. Here, a magnetic assembly route was put forward to organize monodisperse noble metal microspheres into a uniform array film for surface-enhanced Raman scattering (SERS) application, which demonstrated the integrated signal sensitivity of single noble metal microspheres and reproducibility of their assembled uniform array film. For this purpose, monodisperse multifunctional Fe3O4@SiO2@TiO2@Ag (FOSTA) colloidal microspheres as building blocks were successfully synthesized through a homemade ultrasonic-assisted reaction system. When used in SERS test, these multifunctional microspheres could firstly bind the analyte (R6G) from solution and then assembled into a uniform film under an external magnetic field, which exhibited high SERS detection sensitivity with good reproducibility. In addition, due to the TiO2 interlayer in FOSTA colloidal microspheres, the building blocks could be recycled and self cleaned through photocatalytic degradation of the adsorbed analyte for recycling SERS application.
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Affiliation(s)
- Bingfang Zou
- Key Laboratory for Special Functional Materials of the Ministry of Education, Henan University, Kaifeng, People's Republic of China
- School of Physics and Electronics, Henan University, Kaifeng, People's Republic of China
| | - Chunyu Niu
- Key Laboratory for Special Functional Materials of the Ministry of Education, Henan University, Kaifeng, People's Republic of China
| | - Ming Ma
- Key Laboratory for Special Functional Materials of the Ministry of Education, Henan University, Kaifeng, People's Republic of China
| | - Lu Zhao
- Key Laboratory for Special Functional Materials of the Ministry of Education, Henan University, Kaifeng, People's Republic of China
| | - Yongqiang Wang
- Key Laboratory for Special Functional Materials of the Ministry of Education, Henan University, Kaifeng, People's Republic of China.
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Tian H, Li H, Fang Y. Binary Thiol-Capped Gold Nanoparticle Monolayer Films for Quantitative Surface-Enhanced Raman Scattering Analysis. ACS APPLIED MATERIALS & INTERFACES 2019; 11:16207-16213. [PMID: 30964281 DOI: 10.1021/acsami.9b02069] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Surface-enhanced Raman scattering (SERS) can provide fingerprint information of analyte molecules with unparalleled sensitivity. However, quantitative analysis using SERS has remained one of the major challenges owing to the difficulty of obtaining reproducible SERS substrates with high-density hotspots. Here, we report the rational design and fabrication of a binary thiol-capped gold nanoparticle (AuNP) monolayer film (MLF) as a substrate for highly sensitive and quantitative SERS analysis. The two thiol ligands chemically bonded to the AuNPs play different roles: dodecanethiol with a long alkyl chain controls the interparticle gaps and electromagnetic coupling among AuNPs and 4-mercaptopyridine works as a Raman internal standard (IS). The binary thiol-capped AuNPs can self-assemble into an ordered MLF with high-density hotspots and uniformly distributed IS. The as-prepared MLF has been demonstrated as a reliable SERS substrate for quantitative detection of fungicide malachite green in aqueous solution, with a high enhancement factor (up to 3.3 × 107) and a low detection limit (100 pM). Moreover, the MLF SERS substrate is flexible and transparent, which has enabled in situ detection of trace fungicide residues in a shrimp tissue.
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Affiliation(s)
- Huihui Tian
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, CAS Center for Excellence in Nanoscience , National Center for Nanoscience and Technology , Beijing 100190 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Hongbian Li
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, CAS Center for Excellence in Nanoscience , National Center for Nanoscience and Technology , Beijing 100190 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Ying Fang
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, CAS Center for Excellence in Nanoscience , National Center for Nanoscience and Technology , Beijing 100190 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
- CAS Center for Excellence in Brain Science and Intelligence Technology , 320 Yue Yang Road , Shanghai 200031 , China
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Huang X, Shi W, Bao N, Yu C, Gu H. Electrochemically reduced graphene oxide and gold nanoparticles on an indium tin oxide electrode for voltammetric sensing of dopamine. Mikrochim Acta 2019; 186:310. [PMID: 31037355 DOI: 10.1007/s00604-019-3408-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2019] [Accepted: 04/02/2019] [Indexed: 11/28/2022]
Abstract
The authors describe an electrochemical dopamine sensor that is based on the use of electrochemically co-reduced graphene oxide (Er-GO) and gold nanoparticles (AuNPs) on an indium-tin oxide (ITO) electrode. The synergistic effects of Er-GO and Er-AuNPs promote electron transport in the modified ITO. This results in an excellent performance for voltammetric sensing of dopamine (DA). Under the optimum conditions and a typical working potential of -0.05 V (vs. Ag/AgCl), the ITO electrode has a linear response in the 0.02-200 μM DA concentration range and a low detection limit of 15 nM. The sensor also showed a good selectivity over ascorbic acid and uric acid. The feasibility of the method was studied by analyzing DA in cerebrospinal fluid of rats. Graphical abstract Schematic presentation of one-step electrochemical co-reduction of graphene oxide (GO) and gold nanoparticles (AuNPs) on an ITO electrode for voltammetric sensing of dopamine.
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Affiliation(s)
- Xin Huang
- School of Public Health, Nantong University, Nantong, 226019, People's Republic of China
| | - Weishan Shi
- School of Public Health, Nantong University, Nantong, 226019, People's Republic of China
| | - Ning Bao
- School of Public Health, Nantong University, Nantong, 226019, People's Republic of China
| | - Chunmei Yu
- School of Public Health, Nantong University, Nantong, 226019, People's Republic of China.
| | - Haiying Gu
- School of Public Health, Nantong University, Nantong, 226019, People's Republic of China.
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Yang N, You T, Gao Y, Lu S, Yin P. One-Step Preparation Method of Flexible Metafilms on the Water-Oil Interface: Self-Assembly Surface Plasmon Structures for Surface-Enhanced Raman Scattering Detection. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:4626-4633. [PMID: 30892046 DOI: 10.1021/acs.langmuir.8b04271] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The present study demonstrated a one-step method for the first time to fabricate self-assembled gold nanoparticle (AuNP) metafilms at the water-toluene interface by adding polystyrene-polyisoprene-polystyrene as the support layer. The thiolated polyethylene glycol and ethanol were used to tune the surface charge density on the AuNPs, constructing a balanced situation at the water-toluene interface. The flexible (AuNP) metafilm can be easily obtained after evaporation of the toluene phase and further used as a surface-enhanced Raman scattering (SERS) substrate for trace thiram detection. The SERS sensitivity was tested using standard Raman probes such as crystal violet and malachite green, both with the detect concentration reaching 1 × 10-11 M. Moreover, the excellent reproducibility and elastic properties make the metafilm promising in practical detection. Hence, the trace thiram detection on an orange pericarp was inspected with the detection limit of 0.5 ppm (1 × 10-6 M) as well as a favorable linearity relation with a correlation coefficient of 0.979, exactly matching the realistic application requirements.
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Affiliation(s)
- Nan Yang
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry , Beihang University , No. 37 Xueyuan Road , Haidian District, Beijing 100191 , China
| | - Tingting You
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry , Beihang University , No. 37 Xueyuan Road , Haidian District, Beijing 100191 , China
| | - Yukun Gao
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry , Beihang University , No. 37 Xueyuan Road , Haidian District, Beijing 100191 , China
| | - Sichen Lu
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry , Beihang University , No. 37 Xueyuan Road , Haidian District, Beijing 100191 , China
| | - Penggang Yin
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry , Beihang University , No. 37 Xueyuan Road , Haidian District, Beijing 100191 , China
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Wang Y, Jin Y, Xiao X, Zhang T, Yang H, Zhao Y, Wang J, Jiang K, Fan S, Li Q. Flexible, transparent and highly sensitive SERS substrates with cross-nanoporous structures for fast on-site detection. NANOSCALE 2018; 10:15195-15204. [PMID: 29845168 DOI: 10.1039/c8nr01628c] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
A flexible and transparent film assembled from the cross-nanoporous structures of Au on PET (CNS of Au@PET) is developed as a versatile and effective SERS substrate for rapid, on-site trace analysis with high sensitivity. The fabrication of the CNS of Au can be achieved on a large scale at low cost by employing an etching process with super-aligned carbon nanotubes as a mask, followed by metal deposition. A strongly enhanced Raman signal with good uniformity can be obtained, which is attributed to the excitation of "hot spots" around the metal nanogaps and sharp edges. Using the CNS of Au@PET film as a SERS platform, real-time and on-site SERS detection of the food contaminant crystal violet (CV) is achieved, with a detection limit of CV solution on a tomato skin of 10-7 M. Owing to its ability to efficiently extract trace analytes, the resulting substrate also achieves detection of 4-ATP contaminants and thiram pesticides by swabbing the skin of an apple. A SERS detection signal for 4-ATP has a relative standard deviation of less than 10%, revealing the excellent reproducibility of the substrate. The flexible, transparent and highly sensitive substrates fabricated using this simple and cost-effective strategy are promising for practical application in rapid, on-site SERS-based detection.
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Affiliation(s)
- Yingcheng Wang
- State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics & Tsinghua-Foxconn Nanotechnology Research Center, Tsinghua University, Beijing 100084, China.
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