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Li Y, Wang Y, Wang M, Zhang J, Wang Q, Li H. A molecularly imprinted nanoprobe incorporating Cu2O@Ag nanoparticles with different morphologies for selective SERS based detection of chlorophenols. Mikrochim Acta 2019; 187:59. [DOI: 10.1007/s00604-019-4052-y] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Accepted: 11/27/2019] [Indexed: 11/29/2022]
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2
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Affiliation(s)
- Jai Prakash
- Department of Chemistry, National Institute of Technology Hamirpur, Hamirpur, India
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Zhang M, Zheng Z, Liu H, Wang D, Chen T, Liu J, Wu Y. Rationally Designed Graphene/Bilayer Silver/Cu Hybrid Structure with Improved Sensitivity and Stability for Highly Efficient SERS Sensing. ACS OMEGA 2018; 3:5761-5770. [PMID: 31458776 PMCID: PMC6641927 DOI: 10.1021/acsomega.8b00565] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2018] [Accepted: 05/17/2018] [Indexed: 05/24/2023]
Abstract
A simple and cost-effective strategy was rationally designed to fabricate a special sandwich structure consisting of graphene, bilayer silver, and a copper plate, which was used as a surface-enhanced Raman scattering (SERS) substrate for highly efficient SERS sensing and detection of trace molecules. Silver dendrite (AgD) nanostructures were subsequently grown on a silver nanosphere (AgNS)/Cu surface to form a bilayer silver/Cu structure, which showed a 1.5-fold Raman enhancement compared to that of the AgNS/Cu substrate. After depositing graphene on the bilayer silver/Cu substrate to obtain a sandwich structure, a higher SERS enhancement and better durability were enabled. The SERS performances, measured by a portable Raman instrument, showed that the optimized sandwich structure substrate exhibited high SERS sensitivity to crystal violet (CV) and rhodamine 6G (R6G) with low limit of detection of 10-9 and 10-8 M, respectively. Such a sandwich-structured substrate exhibited good reproducibility across the entire detection areas with an average relative standard deviation less than 5.9%, which permits its reliable quantitative detection of CV and R6G molecules. In addition, graphene both effectively improved the SERS performances and protected Ag nanocrystals from oxidation, which endowed the sandwich structure a long-term stability with deviation of characteristic peaks' intensity lower than 3.6% after 25 days. This study indicates that the graphene/bilayer silver/Cu sandwich structure as a SERS substrate has a great potential in detecting environmental pollutants.
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Affiliation(s)
- Maofeng Zhang
- School
of Materials Science and Engineering and Anhui Engineering Laboratory of
Non-ferrous Metals and Processing, Hefei
University of Technology, 193 Tunxi Road, Hefei 230009, China
| | - Zhiyuan Zheng
- Department
of Mechanical Engineering, Xuancheng Campus, Hefei University of Technology, 301 Xunhua Road, Xuancheng 242000, China
| | - Honghui Liu
- Department
of Mechanical Engineering, Xuancheng Campus, Hefei University of Technology, 301 Xunhua Road, Xuancheng 242000, China
| | - Dapeng Wang
- Institute
of Intelligent Machines, Chinese Academy
of Sciences, 350 Shushanhu
Road, Hefei 230031, China
| | - Tun Chen
- School
of Materials Science and Engineering and Anhui Engineering Laboratory of
Non-ferrous Metals and Processing, Hefei
University of Technology, 193 Tunxi Road, Hefei 230009, China
| | - Jiaqin Liu
- School
of Materials Science and Engineering and Anhui Engineering Laboratory of
Non-ferrous Metals and Processing, Hefei
University of Technology, 193 Tunxi Road, Hefei 230009, China
| | - Yucheng Wu
- School
of Materials Science and Engineering and Anhui Engineering Laboratory of
Non-ferrous Metals and Processing, Hefei
University of Technology, 193 Tunxi Road, Hefei 230009, China
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Chen WJ, Liu XQ, Zhang S, Jiang H. Preparation of Gap-Controlled Monodispersed Ag Nanoparticles by Amino Groups Grafted on Silica Microspheres as a SERS Substrate for the Detection of Low Concentrations of Organic Compounds. Ind Eng Chem Res 2018. [DOI: 10.1021/acs.iecr.8b00717] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Wen-Jing Chen
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Xiao-Qing Liu
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Shun Zhang
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Hong Jiang
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
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Wang C, Zhang K, Zhou Z, Li Q, Shao L, Hao RZ, Xiao R, Wang S. Vancomycin-modified Fe 3O 4@SiO 2@Ag microflowers as effective antimicrobial agents. Int J Nanomedicine 2017; 12:3077-3094. [PMID: 28450783 PMCID: PMC5399987 DOI: 10.2147/ijn.s132570] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Nanomaterials combined with antibiotics exhibit synergistic effects and have gained increasing interest as promising antimicrobial agents. In this study, vancomycin-modified magnetic-based silver microflowers (Van/Fe3O4@SiO2@Ag microflowers) were rationally designed and prepared to achieve strong bactericidal ability, a wide antimicrobial spectrum, and good recyclability. High-performance Fe3O4@SiO2@Ag microflowers served as a multifunction-supporting matrix and exhibited sufficient magnetic response property due to their 200 nm Fe3O4 core. The microflowers also possessed a highly branched flower-like Ag shell that provided a large surface area for effective Ag ion release and bacterial contact. The modified-vancomycin layer was effectively bound to the cell wall of bacteria to increase the permeability of the cell membrane and facilitate the entry of the Ag ions into the bacterium, resulting in cell death. As such, the fabricated Van/Fe3O4@SiO2@Ag microflowers were predicted to be an effective and environment-friendly antibacterial agent. This hypothesis was verified through sterilization of Gram-negative Escherichia coli and Gram-positive methicillin-resistant Staphylococcus aureus, with minimum inhibitory concentrations of 10 and 20 μg mL-1, respectively. The microflowers also showed enhanced effect compared with bare Fe3O4@SiO2@Ag microflowers and free-form vancomycin, confirming the synergistic effects of the combination of the two components. Moreover, the antimicrobial effect was maintained at more than 90% after five cycling assays, indicating the high stability of the product. These findings reveal that Van/Fe3O4@SiO2@Ag microflowers exhibit promising applications in the antibacterial fields.
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Affiliation(s)
- Chongwen Wang
- College of Life Sciences & Bio-Engineering, Beijing University of Technology
- Beijing Key Laboratory of New Molecular Diagnosis Technologies for Infectious Diseases, Beijing Institute of Radiation Medicine, Beijing
| | - Kehan Zhang
- Beijing Key Laboratory of New Molecular Diagnosis Technologies for Infectious Diseases, Beijing Institute of Radiation Medicine, Beijing
| | - Zhe Zhou
- Beijing Key Laboratory of New Molecular Diagnosis Technologies for Infectious Diseases, Beijing Institute of Radiation Medicine, Beijing
| | - Qingjun Li
- Beijing Key Laboratory of New Molecular Diagnosis Technologies for Infectious Diseases, Beijing Institute of Radiation Medicine, Beijing
| | - Liting Shao
- Beijing Key Laboratory of New Molecular Diagnosis Technologies for Infectious Diseases, Beijing Institute of Radiation Medicine, Beijing
| | - Rong Zhang Hao
- Institute for Disease Control and Prevention, Academy of Military Medical Sciences, Beijing, People’s Republic of China
| | - Rui Xiao
- Beijing Key Laboratory of New Molecular Diagnosis Technologies for Infectious Diseases, Beijing Institute of Radiation Medicine, Beijing
| | - Shengqi Wang
- College of Life Sciences & Bio-Engineering, Beijing University of Technology
- Beijing Key Laboratory of New Molecular Diagnosis Technologies for Infectious Diseases, Beijing Institute of Radiation Medicine, Beijing
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Highly sensitive surface-enhanced Raman scattering detection of hexavalent chromium based on hollow sea urchin-like TiO2@Ag nanoparticle substrate. Biosens Bioelectron 2017; 87:187-194. [DOI: 10.1016/j.bios.2016.08.036] [Citation(s) in RCA: 63] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Revised: 07/27/2016] [Accepted: 08/13/2016] [Indexed: 01/01/2023]
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He Q, Zhao A, Li L, Sun H, Wang D, Guo H, Sun M, Chen P. Fabrication of Fe3O4@SiO2@Ag magnetic–plasmonic nanospindles as highly efficient SERS active substrates for label-free detection of pesticides. NEW J CHEM 2017. [DOI: 10.1039/c6nj03335k] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Magnetic–plasmonic nanospindles serve as SERS substrates with controllable aggregation due to steady enrichment of mass molecules nearby abundant hot spots.
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Affiliation(s)
- Qinye He
- Institute of Intelligent Machines
- Chinese Academy of Sciences
- Hefei
- P. R. China
- Department of Chemistry
| | - Aiwu Zhao
- Institute of Intelligent Machines
- Chinese Academy of Sciences
- Hefei
- P. R. China
- Department of Chemistry
| | - Lei Li
- Institute of Intelligent Machines
- Chinese Academy of Sciences
- Hefei
- P. R. China
- Department of Chemistry
| | - Henghui Sun
- Institute of Intelligent Machines
- Chinese Academy of Sciences
- Hefei
- P. R. China
- State Key Laboratory of Transducer Technology
| | - Dapeng Wang
- Institute of Intelligent Machines
- Chinese Academy of Sciences
- Hefei
- P. R. China
- Department of Chemistry
| | - Hongyan Guo
- Institute of Intelligent Machines
- Chinese Academy of Sciences
- Hefei
- P. R. China
- Department of Chemistry
| | - Mei Sun
- Institute of Intelligent Machines
- Chinese Academy of Sciences
- Hefei
- P. R. China
- State Key Laboratory of Transducer Technology
| | - Ping Chen
- Institute of Intelligent Machines
- Chinese Academy of Sciences
- Hefei
- P. R. China
- State Key Laboratory of Transducer Technology
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Wang C, Wang J, Li P, Rong Z, Jia X, Ma Q, Xiao R, Wang S. Sonochemical synthesis of highly branched flower-like Fe 3O 4@SiO 2@Ag microcomposites and their application as versatile SERS substrates. NANOSCALE 2016; 8:19816-19828. [PMID: 27878199 DOI: 10.1039/c6nr07295j] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We report a novel strategy for the synthesis of magnetic-based flower-like silver composite microspheres (Fe3O4@SiO2@Ag microflowers) with a highly branched shell structure through a sonochemical-assisted method. The obtained Fe3O4@SiO2@Ag microflowers possess good dispersity, high magnetic responsiveness, and highly reproducible structures. The size and morphology of the silver petal shell of these microflowers can be easily controlled by varying the experimental parameters. The silver petal provides an effectively large surface area for forming sufficient plasmonic hot spots and capturing target molecules. The microscale magnetic core endows microflowers with superior magnetic nature to enrich targeted analytes and create abundant interparticle hot spots through magnetism-induced aggregation. Hence, Fe3O4@SiO2@Ag microflowers could be a versatile SERS substrate, as verified by the detection of the non-adsorbed R6G molecules and the adsorbed pesticide thiram, with a detection limit as low as 1 × 10-14 M and 1 × 10-11 M, respectively. We further demonstrate that aptamer-functionalized microflowers can easily capture S. aureus in tap water and significantly enhance their SERS signal. Moreover, the microflowers can be easily recycled because of the intrinsic magnetism of the Fe3O4 cores, which indicate a new route in eliminating the "single-use" problem of traditional SERS substrates. These advantages make the microflowers powerful SERS probes for chemical and biological analyses.
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Affiliation(s)
- Chongwen Wang
- Beijing Institute of Radiation Medicine, Beijing 100850, PR China. and College of Life Sciences & Bio-Engineering, Beijing University of Technology, Beijing 100124, PR China
| | - Junfeng Wang
- Beijing Institute of Radiation Medicine, Beijing 100850, PR China. and College of Mechatronics and Automation, National University of Defense Technology, Changsha, Hunan 410073, PR China
| | - Ping Li
- Beijing Institute of Radiation Medicine, Beijing 100850, PR China.
| | - Zhen Rong
- Beijing Institute of Radiation Medicine, Beijing 100850, PR China.
| | - Xiaofei Jia
- Beijing Institute of Radiation Medicine, Beijing 100850, PR China. and College of Life Sciences & Bio-Engineering, Beijing University of Technology, Beijing 100124, PR China
| | - Qiuling Ma
- Beijing Institute of Radiation Medicine, Beijing 100850, PR China.
| | - Rui Xiao
- Beijing Institute of Radiation Medicine, Beijing 100850, PR China.
| | - Shengqi Wang
- Beijing Institute of Radiation Medicine, Beijing 100850, PR China. and College of Life Sciences & Bio-Engineering, Beijing University of Technology, Beijing 100124, PR China
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Frank AJ, McEneny-King A, Cathcart N, Kitaev V. Homogeneously magnetically concentrated silver nanoparticles for uniform “hot spots” in surface enhanced Raman spectroscopy. RSC Adv 2015. [DOI: 10.1039/c5ra11660k] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Same-charge maghemite NPs act as a hydrodynamic net to concentrate SERS active AgJ13NPs, enabling uniform “hot spots” and reproducible Raman detection of low analyte concentrations.
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Affiliation(s)
- Andrew J. Frank
- Department of Chemistry and Biochemistry
- Wilfrid Laurier University
- Waterloo
- Canada
| | - Alanna McEneny-King
- Department of Chemistry and Biochemistry
- Wilfrid Laurier University
- Waterloo
- Canada
| | - Nicole Cathcart
- Department of Chemistry and Biochemistry
- Wilfrid Laurier University
- Waterloo
- Canada
| | - Vladimir Kitaev
- Department of Chemistry and Biochemistry
- Wilfrid Laurier University
- Waterloo
- Canada
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