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Fan B, Wang Y, Li Z, Xun D, Dong J, Zhao X, Fan X, Wang Y. Si@Ag@PEI substrate-based SERS sensor for rapid detection of illegally adulterated sulfur dioxide in traditional Chinese medicine. Talanta 2022; 238:122988. [PMID: 34857322 DOI: 10.1016/j.talanta.2021.122988] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2021] [Revised: 10/14/2021] [Accepted: 10/20/2021] [Indexed: 01/06/2023]
Abstract
The illegal adulteration of sulfur dioxide in natural healthcare products may lead to serious health problems, which raise an urgent demand of straightforward approach for detecting sulfur dioxide. In this paper, surface-enhanced Raman scattering (SERS) sensor with sample preparation apparatus for headspace adsorption of SO2 has been developed, which was successfully applied to detect illegal adulteration of sulfur dioxide in traditional Chinese medicine (TCM). Functional membrane substrate of Si@Ag@PEI composite was synthesized to enhance the adsorption and Raman signal of SO2. A 3D-printed headspace extraction device was designed to adsorbed SO2 by Si@Ag@PEI membrane after micro-extraction of TCM samples in 15 min. The content of sulfur dioxide was subsequently quantitatively measured by SERS sensor. The linear range of sensor is between 2.5 and 250 mg/kg with limit of detection of 0.25 mg/kg, which is lower than the strictest standard of Chinese Pharmacopoeia (10 mg/kg). The proposed approach was used to detect the SO2 residue in TCMs including ginseng, Salvia miltiorrhiza, and bitter almonds. The fabricated sensor exhibited satisfied sensitivity and stability, which provide a simple approach for on-site detection of illegal adulteration of sulfur dioxide.
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Affiliation(s)
- Bo Fan
- Pharmaceutical Informatics Institute, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Yingchao Wang
- Pharmaceutical Informatics Institute, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, 310058, China; Innovation Institute for Artificial Intelligence in Medicine of Zhejiang University, Hangzhou, 310018, China
| | - Zhenhao Li
- Zhejiang Shouxiangu Institute of Rare Medicine Plant, Wuyi, 321200, China
| | - Dejin Xun
- Pharmaceutical Informatics Institute, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Jian Dong
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, 210096, China
| | - Xiangwei Zhao
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, 210096, China
| | - Xiaohui Fan
- Pharmaceutical Informatics Institute, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, 310058, China; State Key Laboratory of Component-Based Chinese Medicine, Tianjin, 301617, China
| | - Yi Wang
- Pharmaceutical Informatics Institute, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, 310058, China; Innovation Institute for Artificial Intelligence in Medicine of Zhejiang University, Hangzhou, 310018, China; State Key Laboratory of Component-Based Chinese Medicine, Tianjin, 301617, China.
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Ban S, Liu H, Xiao S, Mao J, Luo J. Influence of InP coupling cavity on Fano resonance of sub wavelength MIM waveguide. Sci Rep 2021; 11:11633. [PMID: 34078961 PMCID: PMC8172637 DOI: 10.1038/s41598-021-90773-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2021] [Accepted: 05/12/2021] [Indexed: 11/20/2022] Open
Abstract
In this paper, influence of InP coupling cavity on Fano resonance of sub wavelength MIM waveguide was studied by FDTD. It was observed that the resonant wavelengths of mode mj (j = 1, 2, 3) were closely related with the height H2 of InP coupling cavity. In addition, before and after the addition of air cavity, the relative farfield intensities I was a function of height H2. Therefore, InP as discrete state could be used as the filling dielectrics of Fano resonance in the MIM waveguide.
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Affiliation(s)
- Shihao Ban
- School of Physics and Electronics, Hunan University, Changsha, 410082, People's Republic of China
| | - Huangqing Liu
- School of Physics and Electronics, Hunan University, Changsha, 410082, People's Republic of China.
| | - Shifang Xiao
- School of Physics and Electronics, Hunan University, Changsha, 410082, People's Republic of China
| | - Jingjing Mao
- Huaihua Normal College, Huaihua, 418008, People's Republic of China.
| | - Jie Luo
- School of Material Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, Hunan, People's Republic of China
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Dong J, Cao Y, Han Q, Wang Y, Qi M, Zhang W, Qiao L, Qi J, Gao W. Plasmon-exciton coupling for nanophotonic sensing on chip. OPTICS EXPRESS 2020; 28:20817-20829. [PMID: 32680134 DOI: 10.1364/oe.387867] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Accepted: 06/22/2020] [Indexed: 06/11/2023]
Abstract
The monolayer graphene-noble metallic nanostructure hybrid system with excellent optical characteristic, which is deserved pay attentions in the study of surface-enhanced Raman scattering spectroscopy. In this work, a hybrid sandwich structure is designed to transfer single-layer graphene to the surface of discs substrate covered by silver film and assembly of the dense Au nanoparticles (AuNPs). Blu-ray disc has a cycle density of approximately 5.7 times that of DVD-R due to the different storage capacities of these optical discs. In the research, enhancement effects have been explored for two different periodic grating structures. Compared to spectra of Si/G structure, Graphene Raman spectra from Blu-grating/AuNPs/G structure and Blu-grating/G/AuNPs enhancement multiples at the 2D peak position possesses different Raman responses of 1.09 and 2.51 times, respectively. The sandwich hybrid structure of Ag grating/graphene/AuNPs obtains a Raman enhancement factor (EF) of 6.2×108 for Rhodamine 6G and surface-enhanced Raman Scattering(SERS) detection limit of 0.1 nM. These findings can be attributed to the electric field enhancement of the hybrid structure and the chemical enhancement of graphene. This study provides a new approach for SERS detection and offers a new technique for designing SERS sensors with grapheme-plasmon hybrid structures.
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Liu Y, Yang D, Zhao Y, Yang Y, Wu S, Wang J, Xia L, Song P. Solvent-controlled plasmon-assisted surface catalysis reaction of 4-aminothiophenol dimerizing to p,p'-dimercaptoazobenzene on Ag nanoparticles. Heliyon 2019; 5:e01545. [PMID: 31061908 PMCID: PMC6488539 DOI: 10.1016/j.heliyon.2019.e01545] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Revised: 03/21/2019] [Accepted: 04/18/2019] [Indexed: 01/13/2023] Open
Abstract
A large number of literatures have investigated the selective photocatalytic reaction of 4-aminothiophenol (PATP) to p,p'-dimercaptoazobenzene (DMAB). Most of them mainly study the contribution of substrate, excitation wavelength, exposure time, pH and added cations to plasmon-assisted surface catalytic reactions. However, we mainly study focuses on the effects of solvents on the dimerization of PATP to DMAB under the action of Ag nanoparticles (NPs). In experiments, a variety of diols was selected as solvents for the probe molecule PATP, and power-dependent SERS spectra were obtained at an excitation wavelength of 532 nm. From the laser-dependent SERS spectrum, we found that the characteristic peak enhancement effect of the product DMAB in different solvents is significantly different. That is, different solvents could regulate the rate at which DMAB is produced from PATP. Based on the experimental results, we further explored how different diol solvents regulate the response of PATP to DMAB. Our conclusion is that the solvent in the system can quickly capture the hot electrons generated by the decay of the plasmon, so that the remaining holes can oxidize PATP to form DMAB. The ability to trap hot electrons is different due to the difference in the position of the functional groups in the solvent, so that the photocatalytic reaction rate of the hole-oxidized PATP is different. The ability to capture electrons varies depending on the position of the functional groups in the solvent, so the oxidation rate of the photocatalytic reaction is also different. This work not only deepens our understanding of the mechanism of hole-driven surface catalysis oxidation reaction, but also provides a convenient method for regulating the rate of catalytic oxidation.
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Affiliation(s)
- Yu Liu
- College of Chemistry, Liaoning University, Shenyang 110036, China
| | - Dongqi Yang
- College of Chemistry, Liaoning University, Shenyang 110036, China
| | - Yuanchun Zhao
- College of Chemistry, Liaoning University, Shenyang 110036, China
| | - Yanqiu Yang
- College of Chemistry, Liaoning University, Shenyang 110036, China
| | - Shiwei Wu
- College of Chemistry, Liaoning University, Shenyang 110036, China
- Experimental Center of Shenyang Normal University, Shenyang 110034, China
| | - Jing Wang
- College of Chemistry, Liaoning University, Shenyang 110036, China
| | - Lixin Xia
- College of Chemistry, Liaoning University, Shenyang 110036, China
| | - Peng Song
- College of Physical, Liaoning University, Shenyang 110036, China
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Abstract
In this study, we review photocatalytic reversible surface catalytic reactions driven by localized surface plasmon resonance. Firstly, we briefly introduce the synthesis of 4,4′-dimercaptoazobenzene (DMAB) from 4-nitrobenzenethiol (4NBT) using surface-enhanced Raman scattering (SERS) technology. Furthermore, we study the photosynthetic and degradation processes of 4NBT to DMAB reduction, as well as factors associated with them, such as laser wavelength, reaction time, substrate, and pH. Last but not least, we reveal the competitive relationship between photosynthetic and degradation pathways for this reduction reaction by SERS technology on the substrate of Au film over a nanosphere.
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Yu L, Wu S, Liu Y, Song P, Xia L. Distance-regulating surface plasmon catalyzed coupling reaction of p-nitrophenyl disulfide. RSC Adv 2018; 8:35646-35650. [PMID: 35547937 PMCID: PMC9087908 DOI: 10.1039/c8ra07847e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2018] [Accepted: 10/12/2018] [Indexed: 11/21/2022] Open
Abstract
In this study, we attempted to regulate the intermolecular distance of PNTP molecules on the surface of silver foil by breaking the S-S bond of NPDS. Though changing the laser wavelength and power, SERS conditions, the Raman spectra of NPDS and PNTP with different concentrations were compared. We found that, under SERS conditions, NPDS converted more efficiently than PNTP to DMAB at low-concentration with low-power and low-energy irradiation. The results indicate that the distance between molecules plays a significant role in the reaction of PNTP to form DMAB.
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Affiliation(s)
- Long Yu
- College of Chemistry, Liaoning University Shenyang 110036 China
| | - Shiwei Wu
- College of Chemistry, Liaoning University Shenyang 110036 China .,Experimental Center of Shenyang Normal University Shenyang 110034 China
| | - Yu Liu
- College of Chemistry, Liaoning University Shenyang 110036 China
| | - Peng Song
- College of Physical, Liaoning University Shenyang 110036 China
| | - Lixin Xia
- College of Chemistry, Liaoning University Shenyang 110036 China
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