1
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Fang G, Hasi W, Lin X, Han S. Automated identification of pesticide mixtures via machine learning analysis of TLC-SERS spectra. JOURNAL OF HAZARDOUS MATERIALS 2024; 474:134814. [PMID: 38850932 DOI: 10.1016/j.jhazmat.2024.134814] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2024] [Revised: 05/19/2024] [Accepted: 06/03/2024] [Indexed: 06/10/2024]
Abstract
Identification of components in pesticide mixtures has been a major challenge in spectral analysis. In this paper, we assembled monolayer Ag nanoparticles on Thin-layer chromatography (TLC) plates to prepare TLC-Ag substrates with mixture separation and surface-enhanced Raman scattering (SERS) detection. Spectral scans were performed along the longitudinal direction of the TLC-Ag substrate to generate SERS spectra of all target analytes on the TLC plate. Convolutional neural network classification and spectral angle similarity machine learning algorithms were used to identify pesticide information from the TLC-SERS spectra. It was shown that the proposed automated spectral analysis method successfully classified five categories, including four pesticides (thiram, triadimefon, benzimidazole, thiamethoxam) as well as a blank TLC-Ag data control. The location of each pesticide on the TLC plate was determined by the intersection of the information curves of the two algorithms with 100 % accuracy. Therefore, this method is expected to help regulators understand the residues of mixed pesticides in agricultural products and reduce the potential risk of agricultural products to human health and the environment.
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Affiliation(s)
- Guoqiang Fang
- National Key Laboratory of Laser Spatial Information, Harbin Institute of Technology, Harbin 150080, China; Zhengzhou Research Institute, Harbin Institute of Technology, Zhengzhou 450018, China
| | - Wuliji Hasi
- National Key Laboratory of Laser Spatial Information, Harbin Institute of Technology, Harbin 150080, China; Zhengzhou Research Institute, Harbin Institute of Technology, Zhengzhou 450018, China.
| | - Xiang Lin
- Key Laboratory of New Energy and Rare Earth Resource Utilization of State Ethnic Affairs Commission, Key Laboratory of Photosensitive Materials & Devices of Liaoning Province, School of Physics and Materials Engineering, Dalian Minzu University, Dalian 116600, China.
| | - Siqingaowa Han
- Department of Combination of Mongolian Medicine and Western Medicine Stomatology, Affiliated Hospital of Inner Mongolia University for the Nationalities, Tongliao 028043, China
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2
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Wang C, Zhao J, Gu C, Jiang T, Li X. Synergistic photoinduced charge transfer resonance from porous ZIF-67 decorated violet phosphorus array for SERS immunoassay of SARS-CoV-2 spike protein. Colloids Surf B Biointerfaces 2024; 237:113833. [PMID: 38484444 DOI: 10.1016/j.colsurfb.2024.113833] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2023] [Revised: 01/12/2024] [Accepted: 03/03/2024] [Indexed: 04/08/2024]
Abstract
As a rapid, highly sensitive, and user-friendly technique, surface-enhanced Raman scattering (SERS) has an extraordinary appeal to home self-test of COVID-19 during the post pandemic era. However, most of the existing SERS substrates have been still criticized in stability, repeatability, and sample enrichment. To address these obstacles, a novel non-metallic SERS substrate with porous surfaces and array geometry was developed by in-situ growing ZIF-67 particles on two-dimensional violet phosphorus (VP) matrix. Chemical enhancement was prominently promoted by the synergistic photoinduced charge transfer resonance in the hybrid band structure of the ZIF-67@VP substrate, facilitating a noble metal-similar enhancement factor of 6.11 × 107. The biocompatible ZIF-67@VP porous array with attractive enhancement capability and high anchoring efficiency was further utilized to monitoring SARS-CoV-2 spike protein in practical saliva samples based on a sandwich immunostructure, achieving a limit of detection of 1.7 ng/mL assisted by black phosphorus nanosheets. This nonmetallic immunoassay strategy with exceptional sensitivity and specificity is predicted to extend the utilization of SERS obstacle in daily infectious disease screening.
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Affiliation(s)
- Chucheng Wang
- School of Materials Science and Chemical Engineering, Ningbo University, Ningbo, Zhejiang 315211, PR China
| | - Jialong Zhao
- School of Materials Science and Chemical Engineering, Ningbo University, Ningbo, Zhejiang 315211, PR China
| | - Chenjie Gu
- School of Materials Science and Chemical Engineering, Ningbo University, Ningbo, Zhejiang 315211, PR China
| | - Tao Jiang
- School of Materials Science and Chemical Engineering, Ningbo University, Ningbo, Zhejiang 315211, PR China.
| | - Xing Li
- School of Materials Science and Chemical Engineering, Ningbo University, Ningbo, Zhejiang 315211, PR China.
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3
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Lv E, Wang T, Wang J, Sun R, Zhang C, Yu J, Li Z, Man B, Zhao X, Zhang C. Cascade Bowl Multicavity Structure for In Situ Surface-Enhanced Raman Scattering Detection of Organic Gas Molecules. J Phys Chem Lett 2024; 15:2247-2254. [PMID: 38380862 DOI: 10.1021/acs.jpclett.4c00087] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2024]
Abstract
With the increasing emphasis on atmospheric environmental protection, it is crucial to find an efficient, direct, and accurate method to identify pollutant species in the atmosphere. To solve this problem, we designed and prepared the cascade multicavity (CMC) structure composed with silver nanoparticles (Ag NPs) as a surface-enhanced Raman scattering (SERS) substrate with favorable light transmittance and flexibility. The multicavity structure distributed on the surface introducing the homogeneous connecting holes endows the structure to more fully utilize the incident light while slowing the gas movement rate. Theoretical and experimental results have demonstrated that the Ag NPs/cascade multicavity (Ag-CMC) SERS substrate is a highly sensitive SERS substrate that can be used for in situ detection of gases under non-perpendicularly incident laser irradiation or bending of the substrate. We believe that the SERS substrate can provide a more efficient and feasible way for in situ detection of gaseous pollutants.
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Affiliation(s)
- Enze Lv
- Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, Hubei 430074, People's Republic of China
| | - Tao Wang
- Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, Hubei 430074, People's Republic of China
| | - Junkun Wang
- School of Physics and Electronics, Shandong Normal University, Jinan, Shandong 250014, People's Republic of China
| | - Ruijing Sun
- School of Physics and Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan, Hubei 430074, People's Republic of China
| | - Chengrui Zhang
- School of Physics and Electronics, Shandong Normal University, Jinan, Shandong 250014, People's Republic of China
| | - Jing Yu
- School of Physics and Electronics, Shandong Normal University, Jinan, Shandong 250014, People's Republic of China
| | - Zhen Li
- School of Physics and Electronics, Shandong Normal University, Jinan, Shandong 250014, People's Republic of China
| | - Baoyuan Man
- School of Physics and Electronics, Shandong Normal University, Jinan, Shandong 250014, People's Republic of China
| | - Xiaofei Zhao
- School of Physics and Electronics, Shandong Normal University, Jinan, Shandong 250014, People's Republic of China
| | - Chao Zhang
- School of Physics and Electronics, Shandong Normal University, Jinan, Shandong 250014, People's Republic of China
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4
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Pan J, Yi X, Shao M, Ji C, Pei Z, Zhao X, Yu J, Si H, Li Z, Zhang C. SERS detection of volatile gas in spoiled pork with the Ag/MoS 2 nano-flower cavity/PVDF micron-bowl cavity (FIB) substrate. OPTICS EXPRESS 2024; 32:5149-5160. [PMID: 38439248 DOI: 10.1364/oe.509360] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2023] [Accepted: 01/15/2024] [Indexed: 03/06/2024]
Abstract
Putrescine and cadaverine are significant volatile indicators used to assess the degree of food spoilage. Herein, we propose a micro-nano multi cavity structure for surface-enhanced Raman spectroscopy (SERS) to analyze the volatile gas putrescine and cadaverine in decomposing food. The MoS2 nano-flowers are inserted into a PVDF micro-cavity through in-situ growth, followed by vacuum evaporation technology of Ag nanoparticles to form an Ag/MoS2 nano-flower cavity/PVDF micron-bowl cavity (FIB) substrate. The micro-nano multi cavity structure can improve the capture capacity of both light and gas, thereby exhibiting high sensitivity (EF = 7.71 × 107) and excellent capability for gas detection of 2-naphthalenethiol. The SERS detections of the putrescine and cadaverine are achieved in the spoiled pork samples with the FIB substrate. Therefore, this substrate can provide an efficient, accurate, and feasible method for the specific and quantitative detection in the food safety field.
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5
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Chin-Heng L, Chun-Hung T, Ding-Zheng L. Optimization of physical vapor deposition process for low background nanoimprinted SERS substrate in quantitative melamine analysis. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2024; 306:123563. [PMID: 37890325 DOI: 10.1016/j.saa.2023.123563] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Revised: 10/01/2023] [Accepted: 10/18/2023] [Indexed: 10/29/2023]
Abstract
Uniformity, sensitivity, reproducibility, and cost are the critical parameters of practical surface-enhanced-Raman-spectroscopy (SERS) substrates. Herein, we proposed a High-Aspect-Ratio-Nano-Pillar-Array (HARNPA) substrate deposited silver by physical vapor deposition (PVD) methods (e.g. E-beam evaporation, sputtering, and a two-stage intermittent sputtering) to fabricate high-performance SERS substrates. The substrate by the E-beam evaporation has a significant SERS effect, but the Raman background induced by the exposure of the polymer HARNPA limits the analyte choice. The substrate by the sputtering method has better step coverage of silver but a lower enhancement factor. Therefore, we proposed a process of two-stage intermittent sputtering to solve these limitations. In addition, we define a factor called the signal-to-background peak ratio (S/B peak ratio) to evaluate the influence of the Raman background from the SERS substrate. Finally, we accomplished a SERS substrate with an S/B peak ratio of 3.48 by intermittent sputtering, which has the best linearity (R2 = 0.97) of the melamine concentration curve and the lowest detection limit (LoD = 5.6 × 10-7 M) that meets the regulatory requirements for melamine detection (3.96 × 10-6 M). The benefits of our SERS substrates are easy fabrication, high sensitivity (EF = 1.44 × 107), high reproducibility (CV = 8.4 %), and excellent uniformity (CV = 7 % in 4″ area), which are beneficial for mass production in the future.
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Affiliation(s)
- Lee Chin-Heng
- Department of Mechanical Engineering, National Taiwan University of Science and Technology, Taiwan, ROC
| | - Tsai Chun-Hung
- Department of Mechanical Engineering, National Taiwan University of Science and Technology, Taiwan, ROC
| | - Lin Ding-Zheng
- Department of Mechanical Engineering, National Taiwan University of Science and Technology, Taiwan, ROC.
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6
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Jin S, Zhang D, Yang B, Guo S, Chen L, Jung YM. Noble metal-free SERS: mechanisms and applications. Analyst 2023; 149:11-28. [PMID: 38051259 DOI: 10.1039/d3an01669b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2023]
Abstract
Surface-enhanced Raman scattering (SERS) is a very important tool in vibrational spectroscopy. The coupling of nanomaterials induces local surface plasmon resonance (LSPR), which contributes greatly to SERS. Due to its remarkable sensitivity in trace detection, SERS has gained prominence in the fields of catalysis, biosensors, drug tracking, and optoelectronic devices. SERS activity is believed to be closely related to the LSPR and charge transfer (CT) of the material. Noble metal nanostructures have been commonly used as SERS-active substrates due to their strong local electric fields and relatively mature preparation, application, and enhancement mechanisms. In recent years, SERS research based on semiconductor materials has attracted significant attention because semiconductor materials have advantages such as repeatable preparation, simple pretreatment, stable SERS spectra and superior biocompatibility, stability, and reproducibility. Semiconductor-based SERS has the potential to enrich SERS theory and applications. Thus, the development of semiconductor materials will introduce a new epoch for SERS-based research. In this review, we outline the two main kinds of semiconductor SERS-active substrates: inorganic and organic semiconductor SERS-active substrates. We also provide an overview of the SERS mechanism for different kinds of materials and SERS-based applications.
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Affiliation(s)
- Sila Jin
- Kangwon Radiation Convergence Research Support Center, Kangwon National University, Chuncheon 24341, Korea.
- Department of Chemistry, University at Albany, State University of New York, Albany, New York 12222, USA
| | - Daxin Zhang
- College of Science, Jilin Institute of Chemical Technology, Jilin, 132022, China
| | - Bo Yang
- School of Pharmaceutical Sciences, Changchun University of Chinese Medicine, Changchun 130117, P.R. China.
| | - Shuang Guo
- Department of Chemistry, Institute for Molecular Science and Fusion Technology, Kangwon National University, Chuncheon 24341, Korea
| | - Lei Chen
- School of Materials Science and Engineering, Jilin Jianzhu University, Changchun 130118, China
| | - Young Mee Jung
- Kangwon Radiation Convergence Research Support Center, Kangwon National University, Chuncheon 24341, Korea.
- Department of Chemistry, Institute for Molecular Science and Fusion Technology, Kangwon National University, Chuncheon 24341, Korea
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7
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de la Asunción-Nadal V, Perales-Rondon JV, Colina A, Jurado-Sánchez B, Escarpa A. Photoactive Au@MoS 2 Micromotors for Dynamic Surface-Enhanced Raman Spectroscopy Sensing. ACS APPLIED MATERIALS & INTERFACES 2023; 15:54829-54837. [PMID: 37971838 PMCID: PMC10694815 DOI: 10.1021/acsami.3c12895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Revised: 10/24/2023] [Accepted: 11/01/2023] [Indexed: 11/19/2023]
Abstract
Photophoretic Au@MoS2 micromotors are used as smart mobile substrates for dynamic surface-enhanced Raman spectroscopy (SERS) sensing. The photophoretic capabilities and swarming-like propulsion of the micromotors allow for their schooling and accumulation in the measuring spot, increasing the density of SERS-active gold nanoparticles for Raman mapping and, simultaneously, the preconcentration of the target analyte. The generation of "hot-microflake spots" directly in the Raman irradiation point results in a 15-18-fold enhancement in the detection of crystal violet without the requirement for additional external sources for propulsion. Moreover, the reproducible collective micromotor motion does not depend on the exact position of the laser spot concerning individual micromotors, which greatly simplifies the experimental setup, avoiding the requirements of sophisticated equipment. The strategy was further applied for the detection of malachite green and paraquat with a good signal enhancement. The new on-the-move-based SERS strategy holds great promise for on-site detection with portable instrumentation in a myriad of environmental monitoring and clinical applications.
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Affiliation(s)
- Víctor de la Asunción-Nadal
- Department
of Analytical Chemistry, Physical Chemistry, and Chemical Engineering, Universidad de Alcala, Alcala de Henares, E-28802 Madrid, Spain
| | - Juan Victor Perales-Rondon
- Department
of Analytical Chemistry, Physical Chemistry, and Chemical Engineering, Universidad de Alcala, Alcala de Henares, E-28802 Madrid, Spain
- Department
of Chemistry, University of Burgos, Pza. Misael Bañuelos s/n, E-09001 Burgos, Spain
| | - Alvaro Colina
- Department
of Chemistry, University of Burgos, Pza. Misael Bañuelos s/n, E-09001 Burgos, Spain
| | - Beatriz Jurado-Sánchez
- Department
of Analytical Chemistry, Physical Chemistry, and Chemical Engineering, Universidad de Alcala, Alcala de Henares, E-28802 Madrid, Spain
- Chemical
Research Institute “Andres M. del Rio”, Universidad de Alcala, E-28802 Madrid, Spain
| | - Alberto Escarpa
- Department
of Analytical Chemistry, Physical Chemistry, and Chemical Engineering, Universidad de Alcala, Alcala de Henares, E-28802 Madrid, Spain
- Chemical
Research Institute “Andres M. del Rio”, Universidad de Alcala, E-28802 Madrid, Spain
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8
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Dzhagan V, Smirnov O, Kovalenko M, Gudymenko O, Mazur N, Kapush O, Skoryk M, Pirko Y, Yemets A, Valakh M, Shepeliavyi P, Yukhymchuk V. SERS-substrates based on ZnO nanoflowers prepared by green synthesis. Anal Biochem 2023; 681:115328. [PMID: 37722524 DOI: 10.1016/j.ab.2023.115328] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Revised: 08/15/2023] [Accepted: 09/15/2023] [Indexed: 09/20/2023]
Abstract
ZnO nanoparticles (NPs) with a flower-like morphology, synthesized by an affordable colloidal route using an aqueous fungi extract of Ganoderma lucidum as a reducing agent and stabilizer, are investigated as SERS-substrate. Each "flower" has large effective surface that is preserved at packing particles into a dense film and thus exhibits an advantageous property for SERS and similar sensing applications. The mycoextract used in our low-cost and green synthesis as surface stabilizer allows subsequent deposition of metal NPs or layers. One type of SERS substrates studied here was ZnO NPs decorated in situ in the solution by Ag NPs, another type was prepared by thermally evaporating Ag layer on the ZnO NP film on a substrate. A huge difference in the enhancement of the same analyte in the solution and in the dried form is found and discussed. Detection down to 10-7 M of standard dye analytes such as rhodamine 6G and methylene blue was achieved without additional optimization of the SERS substrates. The observed SERS-activity demonstrate the potential of both the free-standing flower-like ZnO NPs and thereof made dense films also for other applications where large surface area accessible for the external agent is crucial, such as catalysis or sensing.
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Affiliation(s)
- Volodymyr Dzhagan
- V. Lashkaryov Institute of Semiconductors Physics, National Academy of Sciences of Ukraine, Kyiv, Ukraine; Physics Department, Taras Shevchenko National University of Kyiv, Kyiv, Ukraine.
| | - Oleksandr Smirnov
- ESC "Institute of Biology and Medicine", Taras Shevchenko National University of Kyiv, Kyiv, Ukraine; Institute of Plant Physiology and Genetics, National Academy of Sciences of Ukraine, Kyiv, Ukraine
| | - Mariia Kovalenko
- ESC "Institute of Biology and Medicine", Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
| | - Oleksandr Gudymenko
- V. Lashkaryov Institute of Semiconductors Physics, National Academy of Sciences of Ukraine, Kyiv, Ukraine
| | - Nazar Mazur
- V. Lashkaryov Institute of Semiconductors Physics, National Academy of Sciences of Ukraine, Kyiv, Ukraine
| | - Olga Kapush
- V. Lashkaryov Institute of Semiconductors Physics, National Academy of Sciences of Ukraine, Kyiv, Ukraine
| | - Mykola Skoryk
- G.V. Kurdyumov Institute for Metal Physics, National Academy of Sciences of Ukraine, Kyiv, Ukraine
| | - Yaroslav Pirko
- Institute of Food Biotechnology and Genomics, National Academy of Sciences of Ukraine, Kyiv, Ukraine
| | - Alla Yemets
- Institute of Food Biotechnology and Genomics, National Academy of Sciences of Ukraine, Kyiv, Ukraine
| | - Mykhailo Valakh
- V. Lashkaryov Institute of Semiconductors Physics, National Academy of Sciences of Ukraine, Kyiv, Ukraine
| | - Petro Shepeliavyi
- V. Lashkaryov Institute of Semiconductors Physics, National Academy of Sciences of Ukraine, Kyiv, Ukraine
| | - Volodymyr Yukhymchuk
- V. Lashkaryov Institute of Semiconductors Physics, National Academy of Sciences of Ukraine, Kyiv, Ukraine
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Fu L, Lin CT, Karimi-Maleh H, Chen F, Zhao S. Plasmonic Nanoparticle-Enhanced Optical Techniques for Cancer Biomarker Sensing. BIOSENSORS 2023; 13:977. [PMID: 37998152 PMCID: PMC10669140 DOI: 10.3390/bios13110977] [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: 10/04/2023] [Revised: 11/02/2023] [Accepted: 11/06/2023] [Indexed: 11/25/2023]
Abstract
This review summarizes recent advances in leveraging localized surface plasmon resonance (LSPR) nanotechnology for sensitive cancer biomarker detection. LSPR arising from noble metal nanoparticles under light excitation enables the enhancement of various optical techniques, including surface-enhanced Raman spectroscopy (SERS), dark-field microscopy (DFM), photothermal imaging, and photoacoustic imaging. Nanoparticle engineering strategies are discussed to optimize LSPR for maximum signal amplification. SERS utilizes electromagnetic enhancement from plasmonic nanostructures to boost inherently weak Raman signals, enabling single-molecule sensitivity for detecting proteins, nucleic acids, and exosomes. DFM visualizes LSPR nanoparticles based on scattered light color, allowing for the ultrasensitive detection of cancer cells, microRNAs, and proteins. Photothermal imaging employs LSPR nanoparticles as contrast agents that convert light to heat, producing thermal images that highlight cancerous tissues. Photoacoustic imaging detects ultrasonic waves generated by LSPR nanoparticle photothermal expansion for deep-tissue imaging. The multiplexing capabilities of LSPR techniques and integration with microfluidics and point-of-care devices are reviewed. Remaining challenges, such as toxicity, standardization, and clinical sample analysis, are examined. Overall, LSPR nanotechnology shows tremendous potential for advancing cancer screening, diagnosis, and treatment monitoring through the integration of nanoparticle engineering, optical techniques, and microscale device platforms.
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Affiliation(s)
- Li Fu
- Key Laboratory of Novel Materials for Sensor of Zhejiang Province, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China; (F.C.); (S.Z.)
| | - Cheng-Te Lin
- Qianwan Institute, Ningbo Institute of Materials Technology and Engineering (NIMTE), Chinese Academy of Sciences, Ningbo 315201, China;
- Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering (NIMTE), Chinese Academy of Sciences, Ningbo 315201, China
- University of Chinese Academy of Sciences, 19 A Yuquan Rd., Shijingshan District, Beijing 100049, China
| | - Hassan Karimi-Maleh
- The Quzhou Affiliated Hospital of Wenzhou Medical University, Quzhou People’s Hospital, Wenzhou 325015, China;
- School of Resources and Environment, University of Electronic Science and Technology of China, Chengdu 611731, China
- School of Engineering, Lebanese American University, Byblos 13-5053, Lebanon
| | - Fei Chen
- Key Laboratory of Novel Materials for Sensor of Zhejiang Province, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China; (F.C.); (S.Z.)
| | - Shichao Zhao
- Key Laboratory of Novel Materials for Sensor of Zhejiang Province, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China; (F.C.); (S.Z.)
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Qi X, Cheng Y, Xu R, Li X, Zhang Z, Chen L, Shao Y, Gao Z, Zhu M. Designing of a functional paper-tip substrate for sensitive surface-enhanced Raman spectroscopy (SERS) detection. Anal Chim Acta 2023; 1280:341872. [PMID: 37858570 DOI: 10.1016/j.aca.2023.341872] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 09/21/2023] [Accepted: 10/03/2023] [Indexed: 10/21/2023]
Abstract
A simple and flexible fabrication method of paper SERS substrate was developed by nanoparticles (NPs) droplet self-assembly at the paper tip with a temperature gradient (PTTG). We turned the drawback of the coffee ring effect into an effective way of preparing paper SERS substrate. When the NPs droplets were continuously dripped onto the PTTG, NPs were densely and uniformly distributed at the paper-tip front based on the combination of gravity and the coffee ring effect, which could achieve 91.2-fold improvement of SERS performance compared to a flat filter paper. Meanwhile, the analytes could also be enriched at the paper-tip front, which could achieve 9.3-fold signal enhancement compared to the paper-tip tail. Thus, the PTTG realized an excellent signal amplification for SERS detection. The paper-tip SERS substrate combined with a portable Raman spectrometer yielded an excellent analytical enhancement factor of 1.15 × 105 with the detection limit of 10 nM Rhodamine 6G (R6G). The whole fabrication procedure was completed within 2 h, and the paper-tip substrate showed a satisfactory substrate-to-substrate reproducibility with a relative standard deviation (RSD) of 5.13% (n = 10). It was successfully applied for quantitatively detecting real samples of oxytetracycline and malachite green with recoveries of 83.84-105.25% (n = 3). Meanwhile, we further evaluated the SERS performance of the PTTG using a laboratory-based Raman spectrometer, and it could realize the detection as low as 10 pM R6G. The proposed paper-tip substrate would offer a promising potential application for the on-site SERS analysis of food safety and environmental health.
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Affiliation(s)
- Xiaoxiao Qi
- Institute of Eco-Environmental Forensics, School of Environmental Science and Engineering, Shandong University (Qingdao), No. 72, Binhai Road, Jimo District, Qingdao, Shandong Province, 266237, China
| | - Yongqiang Cheng
- Institute of Eco-Environmental Forensics, School of Environmental Science and Engineering, Shandong University (Qingdao), No. 72, Binhai Road, Jimo District, Qingdao, Shandong Province, 266237, China.
| | - Ranran Xu
- Institute of Eco-Environmental Forensics, School of Environmental Science and Engineering, Shandong University (Qingdao), No. 72, Binhai Road, Jimo District, Qingdao, Shandong Province, 266237, China
| | - Xiaotong Li
- Institute of Eco-Environmental Forensics, School of Environmental Science and Engineering, Shandong University (Qingdao), No. 72, Binhai Road, Jimo District, Qingdao, Shandong Province, 266237, China
| | - Ziwei Zhang
- Institute of Eco-Environmental Forensics, School of Environmental Science and Engineering, Shandong University (Qingdao), No. 72, Binhai Road, Jimo District, Qingdao, Shandong Province, 266237, China
| | - Longyu Chen
- Institute of Eco-Environmental Forensics, School of Environmental Science and Engineering, Shandong University (Qingdao), No. 72, Binhai Road, Jimo District, Qingdao, Shandong Province, 266237, China
| | - Yifan Shao
- Institute of Eco-Environmental Forensics, School of Environmental Science and Engineering, Shandong University (Qingdao), No. 72, Binhai Road, Jimo District, Qingdao, Shandong Province, 266237, China
| | - Zhenhui Gao
- Institute of Eco-Environmental Forensics, School of Environmental Science and Engineering, Shandong University (Qingdao), No. 72, Binhai Road, Jimo District, Qingdao, Shandong Province, 266237, China
| | - Meijia Zhu
- Institute of Eco-Environmental Forensics, School of Environmental Science and Engineering, Shandong University (Qingdao), No. 72, Binhai Road, Jimo District, Qingdao, Shandong Province, 266237, China
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11
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Singh A, Mishra AK. Large area CVD-grown vertically and horizontally oriented MoS 2 nanostructures as SERS biosensors for single molecule detection. NANOSCALE 2023; 15:16480-16492. [PMID: 37794765 DOI: 10.1039/d3nr02284f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/06/2023]
Abstract
Surface-enhanced Raman scattering (SERS) has attracted extensive attention for its rapid, ultra-sensitive, non-destructive and label-free fingerprint detection of trace molecules. Recently, two-dimensional transition metal dichalcogenides have been investigated as SERS substrates owing to their low cost, simple synthesis, excellent optical behavior, tunable bandgap, high carrier mobility and good biocompatibility. Here, we have synthesized 2H-MoS2 nanostructures of different morphologies (vertically and horizontally oriented) via the chemical vapor deposition (CVD) method on different substrates (FTO-coated glass, Si and SiO2-Si) and utilized them as SERS substrates for the detection of bilirubin and vitamin B12 biomolecules. The strong vibronic coupling within the charge transfer (CT) process leads to photo-induced charge transfer (PICT) resonance, showing enhanced SERS activity. This CT mechanism is further confirmed by observing quenching of the room temperature PL spectra and enhanced SERS signals of biomolecules over SERS substrates. To the best of our knowledge, the detection limit in this work (10-11 M for bilirubin and 10-8 M for vitamin B12) is considerably higher than previously reported values. The improved efficiency of the PICT process can be achieved at low temperature, and this is confirmed when performing low temperature-dependent photoluminescence (PL) studies on SERS substrates. Furthermore, we also demonstrated enhanced SERS activity at low temperature on CVD-grown pristine MoS2 films over different substrates for biomolecule detection for the first time, attributing this activity to the enhanced PICT process at low temperature.
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Affiliation(s)
- Ankita Singh
- School of Materials Science and Technology, Indian Institute of Technology (Banaras Hindu University), Varanasi-221005, India.
| | - Ashish Kumar Mishra
- School of Materials Science and Technology, Indian Institute of Technology (Banaras Hindu University), Varanasi-221005, India.
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Liu X, Dang A, Li T, Lee TC, Sun Y, Liu Y, Ye F, Ma S, Yang Y, Deng W. Triple-enhanced Raman scattering sensors from flexible MXene/Au nanocubes platform via attenuating the coffee ring effect. Biosens Bioelectron 2023; 237:115531. [PMID: 37473547 DOI: 10.1016/j.bios.2023.115531] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Revised: 07/09/2023] [Accepted: 07/12/2023] [Indexed: 07/22/2023]
Abstract
Developing substrates that combine sensitivity and signal stability is a major challenge in surface enhanced Raman scattering (SERS) research. Herein, we present a flexible triple-enhanced Raman Scattering MXene/Au nanocubes (AuNCs) sensor fabricated by selective filtration of Ti3C2Tx MXene/AuNCs hybrid on the Ti3C2Tx MXene membrane and subsequent treatment with 1H,1H,2H,2H-perfluoro-octyltriethoxysilane (FOTS). The resultant superhydrophobic MXene/AuNCs-FOTS membrane not only provides the SERS substrate with environmental stability, but also imparts analyte enrichment to enhance the sensitivity (LOD = 1 × 10-14 M) and reliability (RSD = 6.41%) for Rhodamine 6G (R6G) molecules owing to the attenuation of the coffee ring effect. Moreover, the triple enhancement mechanism of combining plasmonic coupling enhancement from plasmonic coupling (EM) of nearby AuNCs at lateral and longitudinal direction of MXene/AuNCs-FOTS membrane, charge transfer (CT) from Ti3C2Tx MXene and target molecules and analyte enrichment function provides the substrate with excellent SERS performance (EF = 3.19 × 109), and allows efficient quantification of biomarkers in urine. This work could provide new insights into MXenes as building blocks for high-performance substrates and fill existing gaps in SERS techniques.
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Affiliation(s)
- Xin Liu
- School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, 710072, PR China; Shannxi Engineering Laboratory for Graphene New Carbon Materials and Applications, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, 710072, PR China
| | - Alei Dang
- School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, 710072, PR China; Shannxi Engineering Laboratory for Graphene New Carbon Materials and Applications, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, 710072, PR China.
| | - Tiehu Li
- School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, 710072, PR China; Shannxi Engineering Laboratory for Graphene New Carbon Materials and Applications, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, 710072, PR China.
| | - Tung-Chun Lee
- Department of Chemistry, University College London (UCL), London, WC1H 0AJ, UK; Institute for Materials Discovery, University College London, London, WC1H 0AJ, UK
| | - Yiting Sun
- School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, 710072, PR China; Shannxi Engineering Laboratory for Graphene New Carbon Materials and Applications, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, 710072, PR China
| | - Yuhui Liu
- School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, 710072, PR China; Shannxi Engineering Laboratory for Graphene New Carbon Materials and Applications, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, 710072, PR China
| | - Fei Ye
- School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, 710072, PR China; Shannxi Engineering Laboratory for Graphene New Carbon Materials and Applications, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, 710072, PR China
| | - Shuze Ma
- School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, 710072, PR China
| | - Yong Yang
- School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, 710072, PR China
| | - Weibin Deng
- School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, 710072, PR China; Shannxi Engineering Laboratory for Graphene New Carbon Materials and Applications, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, 710072, PR China
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13
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Sun C, Ye L, Wang L, Hu Z, Ding J. Surface-enhanced Raman scattering of a gold core-silver shell-sponge substrate for detection of thiram and diquat. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2023; 15:4645-4655. [PMID: 37665316 DOI: 10.1039/d3ay00922j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/05/2023]
Abstract
Aiming at the difficulty of traditional pesticide sampling, a low-cost and convenient flexible surface enhanced Raman scattering (SERS) gold core-silver shell-sponge (Au-Ag-sponge) substrate was synthesized by chemical reduction. The SERS substrate consisted of Au-AgNPs and a melamine sponge. The sponge had a rich open pore structure, which could well "capture" Au-AgNPs, generating a large number of "hot spots". The SERS enhancement activity of the flexible substrate was characterized with rhodamine 6G (R6G) Raman probe molecules. The substrate showed good activity to 10-12 M rhodamine 6G with an enhancement factor (EF) of 7.72 × 106. Applying this substrate to the qualitative and quantitative detection of pesticide residues, the results showed that the Raman intensity was well related to the concentration of pesticide solution with the range of 0.1-10 mg L-1 of thiram and 1-10 mg L-1 of diquat. Furthermore, the substrate was analyzed by finite difference time domain (FDTD) simulation and the results were in good agreement with the experimental results. The reason for the difference in Raman signals of pesticide molecules on the same substrate was the different binding modes of Au-AgNPs on the sponge. Finally, we pointed out the advantages of flexible substrates in the field of pesticide residues, as well as future opportunities and challenges.
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Affiliation(s)
- Chao Sun
- College of Intelligent Manufacturing, Jianghan University, Hubei, Wuhan, China.
| | - Li Ye
- College of Intelligent Manufacturing, Jianghan University, Hubei, Wuhan, China.
| | - Lizheng Wang
- College of Intelligent Manufacturing, Jianghan University, Hubei, Wuhan, China.
| | - Zhiming Hu
- College of Intelligent Manufacturing, Jianghan University, Hubei, Wuhan, China.
| | - Jianjun Ding
- College of Intelligent Manufacturing, Jianghan University, Hubei, Wuhan, China.
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14
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Mei L, Wang Z, Niu Y, Deng W, Shao Y. Graphene nanospacer layer modulated multilayer composite structures of precious metals and their SERS performance. OPTICS EXPRESS 2023; 31:29768-29781. [PMID: 37710770 DOI: 10.1364/oe.497888] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Accepted: 08/10/2023] [Indexed: 09/16/2023]
Abstract
Graphene(G)-noble metal-ZnO hybrid systems were developed as highly sensitive and recyclable surface enhanced Raman scattering (SERS) platforms, in which ultrathin graphene of varying thickness was embedded between two metallic layers on top of a ZnO layer. Due to the multi-dimensional plasmonic coupling effect, the Au/G/Ag@ZnO multilayer structure possessed ultrahigh sensitivity with the detection limit of Rhodamine 6 G (R6G) as low as 1.0×10-13 mol/L and a high enhancement factor of 5.68×107. Both experimental and simulation results showed that graphene films could significantly regulate the interlayer plasmon resonance coupling strength, and single-layer graphene had the best interlayer regulation effect. Additionally, the SERS substrate structure prepared through physical methods exhibited high uniformity, the graphene component of the substrate possessed excellent molecular enrichment ability and silver oxidation inhibition characteristics, resulting in a substrate with high stability and exceptional reproducibility. The signal change was less than 15%. Simultaneously, due to the excellent photocatalytic performance of the low-cost and wide-band-gap semiconductor material ZnO, the SERS substrate exhibited exceptional reusability. Even after five cycles of adsorption-desorption, the SERS performance remained stable and maintained a reliable detection limit. The study introduced a novel approach to creating multilayer composite SERS substrates that exhibited exceptional performance, offering a new analytical tool with high sensitivity, stability, and reusability.
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15
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Fang G, Hasi W, Sha X, Cao G, Han S, Wu J, Lin X, Bao Z. Interfacial Self-Assembly of Surfactant-Free Au Nanoparticles as a Clean Surface-Enhanced Raman Scattering Substrate for Quantitative Detection of As 5+ in Combination with Convolutional Neural Networks. J Phys Chem Lett 2023; 14:7290-7298. [PMID: 37560985 DOI: 10.1021/acs.jpclett.3c01969] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/11/2023]
Abstract
Surface-enhanced Raman scattering (SERS) is a highly sensitive tool in the field of environmental testing. However, the detection and accurate quantification of weakly adsorbed molecules (such as heavy metal ions) remain a challenge. Herein, we combine clean SERS substrates capable of capturing heavy metal ions with convolutional neural network (CNN) algorithm models for quantitative detection of heavy metal ions in solution. The SERS substrate consists of surfactant-free Au nanoparticles (NPs) and l-cysteine molecules. As plasmonic nanobuilt blocks, surfactant-free Au NPs without physical or chemical barriers are more accessible to target molecules. The amino and carboxyl groups in the l-cysteine molecule can chelate As5+ ions. The CNN algorithm model is applied to quantify and predict the concentration of As5+ ions in samples. The results demonstrated that this strategy allows for fast and accurate prediction of As5+ ion concentrations, and the determination coefficient between the predicted and actual values is as high as 0.991.
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Affiliation(s)
- Guoqiang Fang
- National Key Laboratory of Science and Technology on Tuneable Laser, Harbin Institute of Technology, Harbin, 150080, China
- Key Laboratory of New Energy and Rare Earth Resource Utilization of State Ethnic Affairs Commission, Key Laboratory of Photosensitive Materials & Devices of Liaoning Province, School of Physics and Materials Engineering, Dalian Minzu University, Dalian 116600, China
| | - Wuliji Hasi
- National Key Laboratory of Science and Technology on Tuneable Laser, Harbin Institute of Technology, Harbin, 150080, China
| | - Xuanyu Sha
- National Key Laboratory of Science and Technology on Tuneable Laser, Harbin Institute of Technology, Harbin, 150080, China
| | - Guangxu Cao
- Research Center for Space Control and Inertial Technology, Harbin Institute of Technology, Harbin, 150080, P. R. China
| | - Siqingaowa Han
- Department of Combination of Mongolian Medicine and Western Medicine Stomatology, Affiliated Hospital of Inner Mongolia University for the Nationalities, Tongliao 028043, China
| | - Jinlei Wu
- Key Laboratory of New Energy and Rare Earth Resource Utilization of State Ethnic Affairs Commission, Key Laboratory of Photosensitive Materials & Devices of Liaoning Province, School of Physics and Materials Engineering, Dalian Minzu University, Dalian 116600, China
| | - Xiang Lin
- Key Laboratory of New Energy and Rare Earth Resource Utilization of State Ethnic Affairs Commission, Key Laboratory of Photosensitive Materials & Devices of Liaoning Province, School of Physics and Materials Engineering, Dalian Minzu University, Dalian 116600, China
| | - Zhouzhou Bao
- Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200127, China
- Shanghai Key Laboratory of Gynecologic Oncology, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200127, China
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16
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Liao Z, Hu X, Chu J, Wu Y, Ji T, Zhu H, Peng W, Wang J, Zhao H, Chen M. Umbrella-frame silicon nanorod arrays decorated with Au nanoparticles as recyclable SERS substrates. OPTICS EXPRESS 2023; 31:25230-25244. [PMID: 37475333 DOI: 10.1364/oe.493760] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Accepted: 07/01/2023] [Indexed: 07/22/2023]
Abstract
Surface-enhanced Raman scattering (SERS) is a powerful technique for detection and identification of trace amounts of molecules with high specificity. A variety of two- and three-dimensional (3D) SERS substrates have been developed. Among these SERS substrates, to further develop new morphology of 3D SERS-active substrate with robust SERS functionality is still desired and necessary. In this paper, what we believe to be a novel and effective SERS-active substrate based on large-scale 3D Si hierarchical nanoarrays in conjunction with homogeneous Au nanoparticles (AuNPs) was proposed. Its building block shaped like the umbrella-frame structure was fabricated by a simple and cost-effective top-down nanofabrication method. Such umbrella-frame structure achieved excellent SERS performance with high sensitivity and spatial uniformity. For R6G molecules, the detection limit can be as low as 10-14 M, with an enhancement factor of up to 107. The relative standard deviation can reach about 11% above 30 positions across an area of 100×100 μm2. This is mainly attributed to much more active-sites provided by the umbrella-frame structure for adsorption of target molecules and AuNPs, and sufficient 3D hotspots generated by the coupling between the SiNRs guided mode and AuNPs localized surface plasmon resonance (LSPR), as well as that between AuNPs LSPR. Especially by introducing the umbrella-ribs SiNRs and AuNPs, the light field can be greatly confined to the structure surface, creating strongly enhanced and even zero-gap fields in 3D space. Moreover, the proposed SERS-active substrate can be erased and reused multiple times by plasma cleaning and exhibits typically excellent recyclability and stability for robust SERS activity. The experimental results demonstrate the proposed substrate may serve as a promising SERS platform for trace detection of chemical and biological molecules.
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17
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Zheng C, Yu J, Dou L, Wang Z, Huang Z, Li X, Hu X, Li Y. Flexible 3D Substrate of Ag Nanoparticle-Loaded Carbon Aerogels with Outstanding Surface-Enhanced Raman Scattering Performance. ACS APPLIED MATERIALS & INTERFACES 2023. [PMID: 37285222 DOI: 10.1021/acsami.3c04414] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Surface-enhanced Raman scattering (SERS), an ultra-sensitive and non-destructive analytic technique, has attracted wide attention from the scientific community. Despite its rapid development, limited hotspots on the SERS substrates have restricted their potential in practical applications. Herein, we developed a facile method to fabricate a flexible three-dimensional (3D) SERS substrate composed of silver nanoparticles (Ag NPs)-loaded carbon aerogels (CAs). Such a flexible Ag NPs/CAs substrate exhibited numerous hotspots, which can facilely be adjusted not only by tuning the density of Ag NPs but also by controlling the bending degree of the flexible substrate. In addition, the influence of hotspots on the local electric field enhancement was investigated by theoretical calculations. Moreover, the 3D network structure of the CAs with a large specific surface area and strong adsorption ability can improve the capture of target molecules. Consequently, the optimal Ag NPs/CAs substrate has a low detection limit of 10-12 M for rhodamine 6G molecules as well as good repeatability. Furthermore, based on the good performance of SERS detection of the Ag NPs/CAs substrate, it can also be practically used for the detection of thiram molecules on the surface of cherry tomatoes. Such a flexible 3D Ag NPs/CAs substrate has great potential for practical environmental monitoring applications.
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Affiliation(s)
- Chunxue Zheng
- Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, P. R. China
- University of Science and Technology of China, Hefei 230026, P. R. China
| | - Jie Yu
- Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, P. R. China
| | - Liguang Dou
- Beijing International S&T Cooperation Base for Plasma Science and Energy Conversion, Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, P. R. China
| | - Zhen Wang
- Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, P. R. China
- University of Science and Technology of China, Hefei 230026, P. R. China
| | - Zhulin Huang
- Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, P. R. China
- University of Science and Technology of China, Hefei 230026, P. R. China
| | - Xinyang Li
- Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, P. R. China
| | - Xiaoye Hu
- Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, P. R. China
- University of Science and Technology of China, Hefei 230026, P. R. China
| | - Yue Li
- Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, P. R. China
- University of Science and Technology of China, Hefei 230026, P. R. China
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18
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Wang H, Wang C, Huang J, Liu Y, Wu Y, You R, Zhang JH, Lu Y, Shen H. Preparation of SERS substrate with 2D silver plate and nano silver sol for plasticizer detection in edible oil. Food Chem 2023; 409:135363. [PMID: 36592598 DOI: 10.1016/j.foodchem.2022.135363] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Revised: 12/27/2022] [Accepted: 12/28/2022] [Indexed: 01/01/2023]
Abstract
As a widely used industrial additive of plastic products, phthalate ester (PAE) plasticizers can easily migrate into food, threatening human health. In this work, we proposed a rapid, precise, and reliable method to detect PAE plasticizers in edible oils by using surface-enhanced Raman spectroscopy (SERS) technology. A two-dimensional (2D) silver plate synergizing with a nanosilver sol was prepared as a substrate for SERS to detect potassium hydrogen phthalate (PHP), a hydrolysate of a PAE plasticizer. Detection conditions, such as pH values, drying times, and hydrolysate interference, were optimized. The working curve was well fitted with a linear parameter R2 of 0.9994, and the minimum detection limit was evaluated as 10-9 mol/L. Furthermore, the detection accuracy was supported by five edible oil samples. Therefore, using SERS technology to detect PHP is expected to provide an avenue for PAE plasticizer detection in oils and fats, and it features promising potential applications in food safety.
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Affiliation(s)
- Haonan Wang
- College of Chemistry and Materials Science, Fujian Provincial Key Laboratory of Advanced Oriented Chemical Engineer, Fujian Key Laboratory of Polymer Materials, Fujian Normal University, Fuzhou, Fujian 350007, China; School of Resources and Chemical Engineering, Sanming University, Sanming, Fujian 365004, China
| | - Chuyi Wang
- College of Chemistry and Materials Science, Fujian Provincial Key Laboratory of Advanced Oriented Chemical Engineer, Fujian Key Laboratory of Polymer Materials, Fujian Normal University, Fuzhou, Fujian 350007, China
| | - Jiali Huang
- College of Chemistry and Materials Science, Fujian Provincial Key Laboratory of Advanced Oriented Chemical Engineer, Fujian Key Laboratory of Polymer Materials, Fujian Normal University, Fuzhou, Fujian 350007, China
| | - Yunzhen Liu
- College of Chemistry and Materials Science, Fujian Provincial Key Laboratory of Advanced Oriented Chemical Engineer, Fujian Key Laboratory of Polymer Materials, Fujian Normal University, Fuzhou, Fujian 350007, China
| | - Yang Wu
- College of Chemistry and Materials Science, Fujian Provincial Key Laboratory of Advanced Oriented Chemical Engineer, Fujian Key Laboratory of Polymer Materials, Fujian Normal University, Fuzhou, Fujian 350007, China
| | - Ruiyun You
- College of Chemistry and Materials Science, Fujian Provincial Key Laboratory of Advanced Oriented Chemical Engineer, Fujian Key Laboratory of Polymer Materials, Fujian Normal University, Fuzhou, Fujian 350007, China.
| | - Jian-Han Zhang
- School of Resources and Chemical Engineering, Sanming University, Sanming, Fujian 365004, China.
| | - Yudong Lu
- College of Chemistry and Materials Science, Fujian Provincial Key Laboratory of Advanced Oriented Chemical Engineer, Fujian Key Laboratory of Polymer Materials, Fujian Normal University, Fuzhou, Fujian 350007, China.
| | - Huiying Shen
- College of Chemistry and Materials Science, Fujian Provincial Key Laboratory of Advanced Oriented Chemical Engineer, Fujian Key Laboratory of Polymer Materials, Fujian Normal University, Fuzhou, Fujian 350007, China
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19
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Liu K, Gong T, Luo Y, Kong W, Yue W, Wang C, Luo X. Ultrasensitive enhanced Raman spectroscopy by hybrid surface-enhanced and interference-enhanced Raman scattering with metal-insulator-metal structures. OPTICS EXPRESS 2023; 31:15848-15863. [PMID: 37157676 DOI: 10.1364/oe.488410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
High-sensitivity, reproducible, and low-cost substrate has been a major obstacle for practical sensing application of surface-enhancement Raman scattering (SERS). In this work, we report a type of simple SERS substrate which is composed of metal-insulator-metal (MIM) structure of Ag nanoisland (AgNI)-SiO2-Ag film (AgF). The substrates are fabricated by only evaporation and sputtering processes, which are simple, fast and low-cost. By combining the hotspots and interference-enhanced effects in AgNIs and the plasmonic cavity (SiO2) between AgNIs and AgF, the proposed SERS substrate shows an enhancement factor (EF) of 1.83 × 108 with limit of detection (LOD) down to 10-17 mol/L for rhodamine 6 G (R6G) molecules. The EFs are ∼18 times higher than that of conventional AgNIs without MIM structure. In addition, the MIM structure shows excellent reproducibility with relative standard deviation (RSD) less than 9%. The proposed SERS substrate is fabricated only with evaporation and sputtering technique and the conventionally used lithographic methods or chemical synthesis are not required. This work provides a simple way to fabricate ultrasensitive and reproducible SERS substrates which show great promise for developing various biochemical sensors with SERS.
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20
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Vargas-Zamarripa M, Rivera AA, Sierra U, Salas P, Serafín-Muñoz AH, Ramírez-García G. Improved charge-transfer resonance in graphene oxide/ZrO 2 substrates for plasmonic-free SERS determination of methyl parathion. CHEMOSPHERE 2023; 320:138081. [PMID: 36758819 DOI: 10.1016/j.chemosphere.2023.138081] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2022] [Revised: 01/06/2023] [Accepted: 02/05/2023] [Indexed: 06/18/2023]
Abstract
This work reports a sensitive SERS substrate based on graphene oxide (GO) and quantum-sized ZrO2 nanoparticles (GO/ZrO2) for label-free determination of the organophosphate pesticide methyl parathion (MP). The enhanced light-matter interactions and the consequent SERS effect in these substrates resulted from the effective charge transfer (CT) mechanism attributed to synergistic contributions of three main factors: i) the strong molecular adherence of the MP molecules and the ZrO2 surface which allows the first layer-effect, ii) the relatively abundant surface defects in low dimensional ZrO2 semiconductor NPs, which act as intermediate electronic states that reduce the large bandgap barrier, and iii) the hindered charge recombination derived from the transference of the photoinduced holes to the GO layer. This mechanism allowed an enhancement factor of 8.78 × 104 for GO/ZrO2-based substrates, which is more than 5-fold higher than the enhancement observed for platforms without GO. A detection limit of 0.12 μM was achieved with an outstanding repeatability (variation ≤4.5%) and a linear range up to 10 μM, which is sensitive enough to determine the maximal MP concentration permissible in drinking water according to international regulations. Furthermore, recovery rates between 97.4 and 102.1% were determined in irrigation water runoffs, strawberry and black tea extracts, demonstrating the reliability of the hybrid GO/ZrO2 substrate for the organophosphate pesticides quantification in samples related to agri-food sectors and environmental monitoring.
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Affiliation(s)
- Marlene Vargas-Zamarripa
- Biofunctional Nanomaterials Laboratory, Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, 3001, Boulevard Juriquilla, 76230, Querétaro, Mexico; División de Ingenierías, Universidad de Guanajuato, Av. Juárez 77, C.P. 36000, Guanajuato, Mexico
| | - Aura A Rivera
- Biofunctional Nanomaterials Laboratory, Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, 3001, Boulevard Juriquilla, 76230, Querétaro, Mexico
| | - Uriel Sierra
- Laboratorio Nacional de Materiales Grafénicos. Centro de Investigación en Química Aplicada, 140, Blvd. Enrique Reyna, Saltillo, Coahuila, 25294, Mexico
| | - Pedro Salas
- Biofunctional Nanomaterials Laboratory, Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, 3001, Boulevard Juriquilla, 76230, Querétaro, Mexico
| | - Alma H Serafín-Muñoz
- División de Ingenierías, Universidad de Guanajuato, Av. Juárez 77, C.P. 36000, Guanajuato, Mexico
| | - Gonzalo Ramírez-García
- Biofunctional Nanomaterials Laboratory, Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, 3001, Boulevard Juriquilla, 76230, Querétaro, Mexico.
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21
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Peng C, Jin L, Wang F, Yang H, He H. Laser transparent multiplexed SERS microneedles for in situ and real-time detection of inflammation. Biosens Bioelectron 2023; 225:115079. [PMID: 36738731 DOI: 10.1016/j.bios.2023.115079] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Revised: 12/19/2022] [Accepted: 01/10/2023] [Indexed: 01/13/2023]
Abstract
It is a significant challenge to perform painless invasive detection of inflammation progression in relation to the evolution of pH, redox potential, and reactive oxygen species (ROS) levels in an in situ and real-time manner. In this work, polydopamine-modified, silver nanoparticle-decorated poly (methyl methacrylate) microneedles (AgNPs@PDA@MNs) have been developed as a multiplexed surface enhanced Raman scattering (SERS) diagnostic platform. Using rhodamine 6G as the Raman signal molecule, the AgNPs@PDA@MNs demonstrated a significant enhancement with reasonable linearity in the range of 10-3-10-9 mol/L and the limit of detection is 1.0 × 10-10 mol/L 4-mercaptobenzoic acid, anthraquinone-2-carboxylic acid and para-aminothiophenol were covalently anchored on AgNPs@PDA@MNs SERS substrate. I1143/I1183, I1606/I1667 and I1143/I1077 were used as assay standards for pH, redox potential and ROS level detection, respectively. The SERS multiplexed transparent microneedles (SERS mtMNs) linearly responded to pH in the range of 4.0-8.0, redox potential in the range of 417.0-599.8 mV, and ROS levels in the range of 0-480 ng/mL, demonstrating a significant ability to detect complex inflammation in vivo, in situ and in real-time.
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Affiliation(s)
- Cheng Peng
- The Education Ministry Key Lab of Resource Chemistry, Joint International Research Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Frontiers Science Center of Biomimetic Catalysis, Shanghai Normal University, Shanghai, 200234, China
| | - Lili Jin
- Frontiers Science Center for Materiobiology and Dynamic Chemistry, Engineering Research Center for Biomedical Materials of Ministry of Education, East China University of Science and Technology, Shanghai, 200237, China
| | - Feng Wang
- The Education Ministry Key Lab of Resource Chemistry, Joint International Research Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Frontiers Science Center of Biomimetic Catalysis, Shanghai Normal University, Shanghai, 200234, China.
| | - Haifeng Yang
- The Education Ministry Key Lab of Resource Chemistry, Joint International Research Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Frontiers Science Center of Biomimetic Catalysis, Shanghai Normal University, Shanghai, 200234, China.
| | - Hongyan He
- Frontiers Science Center for Materiobiology and Dynamic Chemistry, Engineering Research Center for Biomedical Materials of Ministry of Education, East China University of Science and Technology, Shanghai, 200237, China.
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22
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Liu X, Dang A, Li T, Sun Y, Lee TC, Deng W, Wu S, Zada A, Zhao T, Li H. Plasmonic Coupling of Au Nanoclusters on a Flexible MXene/Graphene Oxide Fiber for Ultrasensitive SERS Sensing. ACS Sens 2023; 8:1287-1298. [PMID: 36867056 DOI: 10.1021/acssensors.2c02808] [Citation(s) in RCA: 17] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/04/2023]
Abstract
High sensitivity, good signal repeatability, and facile fabrication of flexible surface enhanced Raman scattering (SERS) substrates are common pursuits of researchers for the detection of probe molecules in a complex environment. However, fragile adhesion between the noble-metal nanoparticles and substrate material, low selectivity, and complex fabrication process on a large scale limit SERS technology for wide-ranging applications. Herein, we propose a scalable and cost-effective strategy to a fabricate sensitive and mechanically stable flexible Ti3C2Tx MXene@graphene oxide/Au nanoclusters (MG/AuNCs) fiber SERS substrate from wet spinning and subsequent in situ reduction processes. The use of MG fiber provides good flexibility (114 MPa) and charge transfer enhancement (chemical mechanism, CM) for a SERS sensor and allows further in situ growth of AuNCs on its surface to build highly sensitive hot spots (electromagnetic mechanism, EM), promoting the durability and SERS performance of the substrate in complex environments. Therefore, the formed flexible MG/AuNCs-1 fiber exhibits a low detection limit of 1 × 10-11 M with a 2.01 × 109 enhancement factor (EFexp), signal repeatability (RSD = 9.80%), and time retention (remains 75% after 90 days of storage) for R6G molecules. Furthermore, the l-cysteine-modified MG/AuNCs-1 fiber realized the trace and selective detection of trinitrotoluene (TNT) molecules (0.1 μM) via Meisenheimer complex formation, even by sampling the TNT molecules at a fingerprint or sample bag. These findings fill the gap in the large-scale fabrication of high-performance 2D materials/precious-metal particle composite SERS substrates, with the expectation of pushing flexible SERS sensors toward wider applications.
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Affiliation(s)
- Xin Liu
- School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
- Shannxi Engineering laboratory for Graphene New Carbon Materials and Applications, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
| | - Alei Dang
- School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
- Shannxi Engineering laboratory for Graphene New Carbon Materials and Applications, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
| | - Tiehu Li
- School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
- Shannxi Engineering laboratory for Graphene New Carbon Materials and Applications, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
| | - Yiting Sun
- School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
- Shannxi Engineering laboratory for Graphene New Carbon Materials and Applications, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
| | - Tung-Chun Lee
- Department of Chemistry, University College London (UCL), London WC1H 0AJ, U.K
- Institute for Materials Discovery, University College London (UCL), London WC1H 0AJ, U.K
| | - Weibin Deng
- School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
- Shannxi Engineering laboratory for Graphene New Carbon Materials and Applications, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
| | - Shaoheng Wu
- School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
- Shannxi Engineering laboratory for Graphene New Carbon Materials and Applications, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
| | - Amir Zada
- Department of Chemistry, Abdul Wali Khan University Mardan, Mardan 23200, Pakistan
| | - Tingkai Zhao
- School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
- Shannxi Engineering laboratory for Graphene New Carbon Materials and Applications, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
| | - Hao Li
- School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
- Shannxi Engineering laboratory for Graphene New Carbon Materials and Applications, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
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Le D, Kögler M, Guo TL, Roussey M, Hiltunen J. Distance-controlled surface-enhanced Raman spectroscopy of nanoparticles. OPTICS LETTERS 2023; 48:1454-1457. [PMID: 36946951 DOI: 10.1364/ol.483102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2022] [Accepted: 02/09/2023] [Indexed: 06/18/2023]
Abstract
Biological particles, e.g., viruses, lipid particles, and extracellular vesicles, are attracting significant research interest due to their role in biological processes and potential in practical applications, such as vaccines, diagnostics, and therapies. Their surface and interior contain many different molecules including lipids, nucleic acids, proteins, and carbohydrates. In this Letter, we show how distance-controlled surface-enhanced Raman spectroscopy (SERS) is a promising method to extract essential information from the spatial origin of the signal. This is a highly important parameter in the analysis of these biological particles. The principle of the method is demonstrated by using polystyrene (PS) beads as a biological particle model conjugated with gold nanospheres (AuNSs) functioning as distance-controlled SERS probes via biotin-streptavidin binding. By tuning the size of AuNSs, the Raman signal from the PS beads can be weakened while the signal from the biotin-streptavidin complex is enhanced.
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Hu B, Pu H, Sun DW. Flexible Au@AgNRs/CMC/qPCR film with enhanced sensitivity, homogeneity and stability for in-situ extraction and SERS detection of thiabendazole on fruits. Food Chem 2023; 423:135840. [PMID: 37169667 DOI: 10.1016/j.foodchem.2023.135840] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Revised: 02/20/2023] [Accepted: 03/01/2023] [Indexed: 03/06/2023]
Abstract
In this study, a high-performance, stable and homogeneous Au@AgNRs/CMC/qPCR flexible film surface-enhanced Raman scattering (SERS) substrate was constructed by synergistically stabilizing and protecting bimetallic core-shell Au@Ag nanorods (Au@AgNRs) with carboxymethylcellulose (CMC) and fluorescent-quantitative-polymerase-chain-reaction (qPCR) film. The network structure of CMC immobilized and aligned Au@AgNRs through coordination of carboxyl groups with surface Ag atoms to provide intensive and stable 'hot spots', and the qPCR bilayer film performed as carrier and barrier to protect Au@AgNRs from oxidation, humidity and optical damage and improved the robustness and stability. The Au@AgNRs/CMC/qPCR film was used for in-situ extraction and SERS detection of thiabendazole on nectarine (0.24 ppm) and lemon (0.27 ppm) with low detection of limits. Furthermore, it retained 98.6% SERS performance after storage for 90 days under ambient conditions, revealing the great potential in promoting the commercialization of the SERS technique for sensitive contaminants sensing with simple fabrication procedures, homogeneity, reproducibility and long-term stability.
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Chu S, Lu T, Zeng F, Liu B, Qu Y, Pan Y. In Situ Growth of Mo 2C Crystals Stimulating Sodium-Ion Storage Properties of MoO 2 Particles on N-Doped Carbon Nanobundles. Ind Eng Chem Res 2023. [DOI: 10.1021/acs.iecr.2c03712] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Affiliation(s)
- Shile Chu
- Jiangxi Key Laboratory of Nanomaterials and Sensors, School of Physics, Communication and Electronics, College of Life Science, Jiangxi Normal University, Nanchang 330022, Jiangxi, People’s Republic of China
- School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, Jiangxi, People’s Republic of China
| | - Tao Lu
- Jiangxi Key Laboratory of Nanomaterials and Sensors, School of Physics, Communication and Electronics, College of Life Science, Jiangxi Normal University, Nanchang 330022, Jiangxi, People’s Republic of China
- School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, Jiangxi, People’s Republic of China
| | - Fanyan Zeng
- Jiangxi Key Laboratory of Nanomaterials and Sensors, School of Physics, Communication and Electronics, College of Life Science, Jiangxi Normal University, Nanchang 330022, Jiangxi, People’s Republic of China
- School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, Jiangxi, People’s Republic of China
| | - Baoquan Liu
- School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, Jiangxi, People’s Republic of China
| | - Yaohui Qu
- Jiangxi Key Laboratory of Nanomaterials and Sensors, School of Physics, Communication and Electronics, College of Life Science, Jiangxi Normal University, Nanchang 330022, Jiangxi, People’s Republic of China
| | - Yang Pan
- Jiangxi Key Laboratory of Nanomaterials and Sensors, School of Physics, Communication and Electronics, College of Life Science, Jiangxi Normal University, Nanchang 330022, Jiangxi, People’s Republic of China
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Lv E, Wang J, Li J, Zhao X, Yu J, Xu S, Li Z, Man B, Xue M, Xu J, Zhang C. Nanowire-in-bowl-shaped piezoelectric cavity structure for SERS directional detection of nanoplastics less than 50 nm. OPTICS EXPRESS 2023; 31:5297-5313. [PMID: 36823814 DOI: 10.1364/oe.480898] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Accepted: 01/11/2023] [Indexed: 06/18/2023]
Abstract
The accurate detection of nanoplastics is crucial due to their harmful effects on the environment and human beings. However, there is a lack of detection methods for nanoplastics smaller than 50 nm. In this research, we successfully constructed an Ag/CuO nanowire (NW)/BaTiO3@Polyvinylidene fluoride (PVDF) Bowl-shaped substrate with a nanowire-in-Bowl-shaped piezoelectric cavity structure that can modulate surface-enhanced Raman scattering (SERS) by the piezoelectric effect by the virtue of the tip effect of the CuO NW and light focusing effect of the Bowl-shaped cavity. Due to its unique nanowire-in-Bowl-shaped structure and piezoelectrically modifiable ability, nanoplastics less than 50 nm were successfully detected and quantitatively analyzed. We believe that the Ag/CuO NW/BaTiO3@PVDF Bowl-shaped substrate can provide an efficient, accurate, and feasible way to achieve qualitative and quantitative detection of nanoplastics.
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27
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Dong J, Yuan J, Cao Y, Zhao Y, Han Q, Gao W, Li T, Zhu L, Qi J. Electrically controllable self-assembly of gold nanorods into a plasmonic nanostructure for highly efficiency SERS. OPTICS LETTERS 2022; 47:6365-6368. [PMID: 36538439 DOI: 10.1364/ol.477507] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Accepted: 11/12/2022] [Indexed: 06/17/2023]
Abstract
In this Letter, a method for the rapid and efficient preparation of ultrasensitive detection substrates by assembling gold nanorod suspensions with the application of an alternating current (AC) field is proposed, and it is found that frequency and voltage are the effective means of regulation. A sandwich structure (parallel SiO2 plate) not only effectively slows down the evaporation rate, but also visually reveals the changes in the assembly process. Under the optimal assembly conditions, the sensitivity and uniformity of the substrate to different probe molecules are tested. The Raman detection results experimentally show that the detection limits of Rhodamine 6G (Rh6G), crystal violet (CV), and Aspartame (APM) molecular solutions are 10-14 M, 10-10 M, and 62.5 mg/L, respectively, and the mixed dye molecular solutions can also be effectively distinguished. Furthermore, Rh6G and CV characteristic peaks at 1647 cm-1 and 1619 cm-1 were measured at randomly selected positions, and their relative standard deviations (RSDs) were 5.63% and 8.45%, respectively, indicating that the substrate has good uniformity. The effective regulation of the self-assembly results of nanoparticles will further enhance the practical application effect of surface-enhanced Raman technology and expand the application prospects of this technology.
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