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Wang S, Gao J, Wang Y, Lu H, Yang S, Zheng L, Li Y, He G. Solar-powered detection of organic dyes using nitrogen-doped N-TiO 2/Ag 2O nanorod arrays. Mikrochim Acta 2024; 191:353. [PMID: 38809482 DOI: 10.1007/s00604-024-06429-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2024] [Accepted: 05/12/2024] [Indexed: 05/30/2024]
Abstract
Organic pollutant detection has caused widespread concern regarding due to their potential environmental and human health risks. In this work, a nitrogen-doped titanium dioxide/silver oxide (N-TiO2/Ag2O) composite has been designed as a sensitive photoelectrochemical (PEC) monitoring platform of organic dyes. Sensitive determination relies on the outstanding PEC performance of N-TiO2/Ag2O. The improved PEC performance stems from the effective separation of photocarriers and the extended light response range provided by the narrowing bandgap and a p-n junction with N-TiO2/Ag2O. The N-TiO2/Ag2O electrode exhibits a photocurrent density of up to 2.2 mA/cm2, demonstrating three times increase compared with the photocurrent density observed with the pure TiO2 film. The linear detection range for rhodamine B (RhB), methylene blue (MB), and methyl orange (MO) is 0.2 ng/mL to 10 μg/mL with an ultrasensitive detection limit of 0.2 ng/mL without bias voltage. Due to the outstanding photocurrent density and sensitive response to organic pollutants, the N-TiO2/Ag2O PEC sensor provided a promising analytical method to detect environmental organic dyes.
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Affiliation(s)
- Shixuan Wang
- School of Mechanics and Photoelectric Physics, Anhui University of Science and Technology, Huainan, 232001, People's Republic of China
- The First Affiliated Hospital of Anhui University of Science and Technology (Huainan First People's Hospital), Huainan, 232001, People's Republic of China
| | - Juan Gao
- School of Mechanics and Photoelectric Physics, Anhui University of Science and Technology, Huainan, 232001, People's Republic of China.
- The First Affiliated Hospital of Anhui University of Science and Technology (Huainan First People's Hospital), Huainan, 232001, People's Republic of China.
| | - Yanfen Wang
- School of Materials Science and Engineering, Anhui University of Science and Technology, Huainan, 232001, People's Republic of China
| | - Haowen Lu
- School of Mechanics and Photoelectric Physics, Anhui University of Science and Technology, Huainan, 232001, People's Republic of China
| | - Sen Yang
- School of Mechanics and Photoelectric Physics, Anhui University of Science and Technology, Huainan, 232001, People's Republic of China
| | - Lingcheng Zheng
- School of Mechanics and Photoelectric Physics, Anhui University of Science and Technology, Huainan, 232001, People's Republic of China
| | - Yang Li
- School of Mechanics and Photoelectric Physics, Anhui University of Science and Technology, Huainan, 232001, People's Republic of China
| | - Gang He
- School of Materials Science and Engineering, Anhui University, Hefei, 230601, P.R. China
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Liu F, Zhao J, Liu X, Zhen X, Feng Q, Gu Y, Yang G, Qu L, Zhu JJ. PEC-SERS Dual-Mode Detection of Foodborne Pathogens Based on Binding-Induced DNA Walker and C 3N 4/MXene-Au NPs Accelerator. Anal Chem 2023; 95:14297-14307. [PMID: 37718478 DOI: 10.1021/acs.analchem.3c02529] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/19/2023]
Abstract
In this paper, a photoelectrochemical (PEC)-surface-enhanced Raman scattering (SERS) dual-mode biosensor is constructed coupled with a dual-recognition binding-induced DNA walker with a carbon nitride nanosheet (C3N4)/MXene-gold nanoparticles (C/M-Au NPs) accelerator, which is reliable and capable for sensitive and accurate detection of Staphylococcus aureus (S. aureus). Initially, a photoactive heterostructure is formed by combining C3N4 and MXene via a simple electrostatic self-assembly as they possess well-matched band-edge energy levels. Subsequently, in situ growth of gold nanoparticles on the formed surface results in better PEC performance and SERS activity, because of the synergistic effects of surface plasmon resonance and Schottky barrier. Furthermore, a three-dimensional, bipedal, and dual-recognition binding-induced DNA walker is introduced with the formation of Pb2+-dependent DNAzyme. In the presence of S. aureus, a significant quantity of intermediate DNA (I-DNA) is generated, which can open the hairpin structure of Methylene Blue-tagged hairpin DNA (H-MB) on the electrode surface, thereby enabling the switch of signals for the quantitative determination of S. aureus. The constructed PEC-SERS dual-mode biosensor that can be mutually verified under one reaction effectively addresses the problem of the low detection accuracy of traditional sensors. Experimental results revealed that the effective combination of PEC and SERS is achieved for amplification detection of S. aureus with a detection range of 5-108 CFU/mL (PEC) and 10-108 CFU/mL (SERS), and a detection of limit of 0.70 CFU/mL (PEC) and 1.35 CFU/mL (SERS), respectively. Therefore, this study offers a novel and effective dual-mode sensing strategy, which has important implications for bioanalysis and health monitoring.
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Affiliation(s)
- Fanglei Liu
- School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, China
| | - Jiayi Zhao
- School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, China
| | - Xinyu Liu
- School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, China
| | - Xi Zhen
- School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, China
| | - Qiumei Feng
- School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, China
| | - Yingqiu Gu
- School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, China
| | - Guohai Yang
- School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, China
| | - Lulu Qu
- School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, China
| | - Jun-Jie Zhu
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, People's Republic of China
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Jiao A, Cui Q, Li S, Tian Y, Ma H, Wang C, Zhang M, Chen M, Li G, Liu X. Double profound enhancements of Cu 2O nano-octahedrons connected by intertwined Ag nanovines for elevating SERS activity toward ultrasensitive pesticide detection. OPTICS EXPRESS 2022; 30:588-602. [PMID: 35201233 DOI: 10.1364/oe.444937] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2021] [Accepted: 12/15/2021] [Indexed: 06/14/2023]
Abstract
Recently, hybrid plasmonic metal/semiconductor-based surface-enhanced Raman scattering (SERS) has attracted ever-increasing attention due to its combined characteristics of electromagnetic (EM) enhancement and chemical (CM) enhancement, holding great potential for trace molecular detection. Herein, we demonstrate an interesting heterostructure by linking Cu2O nano-octahedrons with intertwined Ag nanovines (NVs). The obtained Ag NVs/Cu2O heterostructures exhibit excellent SERS activity, which is about 2.7 and 7.0 times higher than that of monodispersed Ag or Au nanoparticles (NPs) modified Cu2O. The intertwined Ag NVs among adjacent Cu2O octahedrons serve as efficient electron transport channels, which can obviously promote the separation of electrons and holes, reduce the recombination of photogenerated carriers, and then improve the CM enhancement effect. Meanwhile, the accumulated electrons on plasmonic NVs can effectively optimize the collective oscillation of electrons and further improve the EM enhancement. The optimal SERS substrate possesses fascinating multifunctional SERS properties, including ultra-low detection limit (CV, 10-14 M), excellent anti-interference capability and selectivity. Finally, the established nanosensor can be effectively applied for the quantitative detection of pesticide thiram molecules in soil and biological samples, with low detection limits of 0.48 ng g-1 and 10-7 M, respectively. The proposed work demonstrates a high-performance SERS heterostructure with both improved CM enhancement and enhanced EM effect by linking adjacent Cu2O nano-octahedrons with Ag NVs, which is particularly suitable for ultrasensitive residual pesticide detection in real-world environment.
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Zhang C, Ji C, Yu J, Li Z, Li Z, Li C, Xu S, Li W, Man B, Zhao X. MoS 2-based multiple surface plasmonic coupling for enhanced surface-enhanced Raman scattering and photoelectrocatalytic performance utilizing the size effect. OPTICS EXPRESS 2021; 29:38768-38780. [PMID: 34808922 DOI: 10.1364/oe.441176] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2021] [Accepted: 10/26/2021] [Indexed: 06/13/2023]
Abstract
MoS2-based heterostructures have received increasing attention for not only surface-enhanced Raman scattering (SERS) but also for enhanced photoelectrocatalytic (PEC) performance. This study presents a hydrothermal method for preparing vertical MoS2 nanosheets composed of in situ grown AuNPs with small size and chemically reduced AgNPs with large size to achieve the synergistic enhancement of SERS and PEC properties owing to the size effect of the plasmonic structure. Compared with pristine MoS2 nanosheets and unitary AuNPs or AgNPs composited with MoS2 nanosheets, the ternary heterostructure exhibited the strongest electromagnetic field and surface plasmon coupling, which was confirmed by finite-difference time-domain (FDTD) simulation and absorption spectra. In addition, the experimental results confirmed the outstanding SERS enhancement with an EF of 1.1×109, and the most efficient hydrogen evolution reaction (HER) activity with a sensitive photocurrent response, attributing to the multiple surface plasmonic coupling effects of the Au-Ag bimetal and efficient charge-transfer process between MoS2 and the bimetal. That is, it provides a robust method for developing multi-size bimetal-semiconductor complex nanocomposites for high-performance SERS sensors and PEC applications.
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Zou JW, Li ZD, Kang HS, Zhao WQ, Liu JC, Chen YL, Ma L, Hou HY, Ding SJ. Strong Visible Light Absorption and Abundant Hotspots in Au-Decorated WO 3 Nanobricks for Efficient SERS and Photocatalysis. ACS OMEGA 2021; 6:28347-28355. [PMID: 34723031 PMCID: PMC8552476 DOI: 10.1021/acsomega.1c04536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Accepted: 10/06/2021] [Indexed: 06/13/2023]
Abstract
Metal/semiconductor hybrids show potential application in fields of surface-enhanced Raman spectroscopy (SERS) and photocatalysis due to their excellent light absorption, electric field, and charge-transfer properties. Herein, a WO3-Au metal/semiconductor hybrid, which was a WO3 nanobrick decorated with Au nanoparticles, was prepared via a facile hydrothermal method. The WO3-Au hybrids show excellent visible light absorption, strong plasmon coupling, high-performance SERS, and good photocatalytic activity. In particular, on sensing rhodamine B (RhB) under 532 nm excitation, bare WO3 nanobricks have a Raman enhancement factor of 2.0 × 106 and a limit of detection of 10-8 M due to the charger-transfer property and abundant oxygen vacancies. WO3-Au metal/semiconductor hybrids display a largely improved Raman enhancement factor compared to pure Au and WO3 components owing to the synergistic effect of electromagnetic enhancement and charge transfer. The Raman enhancement factor and limit of detection are further improved, reaching 5.3 × 108 and 10-12 M, respectively, on increasing the content of Au to 2.1 wt %, owing to the strong plasmon coupling between the Au nanoparticles. Additionally, the WO3-Au hybrids also exhibit excellent photocatalytic activity toward degradation of RhB under visible light irradiation. WO3-Au (2.1 wt %) possesses the fastest photocatalytic rate, which is 6.1 and 2.0 times that of pure WO3 nanobricks and commercial P25, respectively. The enhanced photocatalytic activity is attributed to the strong plasmon coupling and the efficient charge transfer between Au and WO3 nanobricks. The as-prepared materials show great potential in detecting and degrading pollutants in environmental treatment.
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Affiliation(s)
- Jing-Wen Zou
- Hubei
Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan 430205, P. R. China
| | - Zhi-Di Li
- Hubei
Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan 430205, P. R. China
| | - Hao-Sen Kang
- Hubei
Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan 430205, P. R. China
| | - Wen-Qin Zhao
- Hubei
Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan 430205, P. R. China
| | - Jing-Chuang Liu
- Hubei
Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan 430205, P. R. China
| | - You-Long Chen
- Hubei
Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan 430205, P. R. China
| | - Liang Ma
- Hubei
Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan 430205, P. R. China
| | - Hua-Yi Hou
- Hubei
Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan 430205, P. R. China
| | - Si-Jing Ding
- School
of Mathematics and Physics, China University
of Geosciences (Wuhan), Wuhan 430074, P. R. China
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Liu Y, Ma H, Han XX, Zhao B. Metal-semiconductor heterostructures for surface-enhanced Raman scattering: synergistic contribution of plasmons and charge transfer. MATERIALS HORIZONS 2021; 8:370-382. [PMID: 34821260 DOI: 10.1039/d0mh01356k] [Citation(s) in RCA: 59] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
After 45 years of its first observation, surface-enhanced Raman spectroscopy (SERS) has become an ultrasensitive tool applied in chemical analysis, materials science, and biomedical research. SERS-active nanomaterials, such as noble metals, transition metals, and semiconductors, have undergone extensive development. The hybridization of semiconductors with plasmonic metal nanomaterials is highly effective in boosting light harvesting and conversion, which enables the rapid growth of metal-semiconductor hybrid nanostructures in SERS-based research fields. With the combination of the unique photoelectric properties and giant SERS signals attributed to the synergistic contribution of plasmons and change transfer (CT), metal-semiconductor heterostructures allow diverse and novel applications of SERS in CT investigations for the rational design of photovoltaic devices and ultrasensitive chemical or biological sensing. In this review, we specifically discuss SERS-active metal-semiconductor heterostructures including their building blocks, enhancement mechanisms, and applications. Moreover, we highlight the current challenges and opportunities for future research in this field based on our recent studies and other related research.
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Affiliation(s)
- Yawen Liu
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, P. R. China.
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Ma L, Chen YL, Song XP, Yang DJ, Li HX, Ding SJ, Xiong L, Qin PL, Chen XB. Structure-Adjustable Gold Nanoingots with Strong Plasmon Coupling and Magnetic Resonance for Improved Photocatalytic Activity and SERS. ACS APPLIED MATERIALS & INTERFACES 2020; 12:38554-38562. [PMID: 32846467 DOI: 10.1021/acsami.0c09684] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Au nanoingots, on which an Au nanosphere is accurately placed in an open Au shell, are synthesized through a controllable hydrothermal method. The prepared Au nanoingots exhibit an adjustable cavity structure, strong plasmon coupling, tunable magnetic plasmon resonance, and prominent photocatalytic and SERS performances. Au nanoingots exhibit two resonance peaks in the extinction spectrum, one (around 550 nm) is ascribed to electric dipole resonance coming from the central Au, and the other one (650-800 nm) is ascribed to the magnetic dipole resonance originating from the open Au shell. Numerical simulations verify that the intense electric and magnetic fields locate in the bowl-shaped nanogap between the Au nanosphere and shell, and they can be further optimized by changing the size of the outer Au shell. Au nanoingots with the largest shell have the strongest electric field because of large-area plasmon coupling, while Au nanoingots with the largest shell opening size have the strongest magnetic field. As a result, the structure-adjustable Au nanoingots show a high tunability and enhancement of catalytic reduction of p-nitrophenol and SERS detection of Rhodamine B. Specially, Au nanoingots with the largest shell size exhibit the highest catalytic activity and Raman signals at 532 nm excitation. However, Au nanoingots with the largest shell opening size have the highest photocatalytic activity with light irradiation (λ > 420 nm) and exhibit the best SERS performance at 785 nm excitation.
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Affiliation(s)
- Liang Ma
- Hubei Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan 430205, P. R. China
| | - You-Long Chen
- Hubei Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan 430205, P. R. China
| | - Xiang-Ping Song
- Department of Gastrointestinal Surgery, Xiangya Hospital, Central South University, Changsha 410008, P.R. China
- Department of Pharmacology and Chemical Biology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15213, United States
| | - Da-Jie Yang
- Beijing Computational Science Research Center, Beijing 100193, P. R. China
| | - Hai-Xia Li
- Hubei Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan 430205, P. R. China
| | - Si-Jing Ding
- School of Mathematics and Physics, China University of Geosciences (Wuhan), Wuhan 430074, P. R. China
| | - Lun Xiong
- Hubei Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan 430205, P. R. China
| | - Ping-Li Qin
- Hubei Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan 430205, P. R. China
| | - Xiang-Bai Chen
- Hubei Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan 430205, P. R. China
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Xu Y, Kutsanedzie FYH, Hassan M, Zhu J, Ahmad W, Li H, Chen Q. Mesoporous silica supported orderly-spaced gold nanoparticles SERS-based sensor for pesticides detection in food. Food Chem 2020; 315:126300. [PMID: 32018077 DOI: 10.1016/j.foodchem.2020.126300] [Citation(s) in RCA: 77] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2019] [Revised: 12/20/2019] [Accepted: 01/25/2020] [Indexed: 02/07/2023]
Abstract
In this study, a novel sensor fabricated with compactly arranged gold nanoparticles (AuNPs) templated from mesoporous silica film (MSF) via air-water interface has been confirmed as a promising surface-enhanced Raman scattering (SERS) substrate for detecting trace levels of 2,4-dichlorophenoxyacetic acid (2,4-D), pymetrozine and thiamethoxam. The densely arranged AuNPs@MSF had an average AuNPs size of 5.15 nm with small nanogaps (<2nm) between AuNPs, and exhibited a high SERS performance. SERS spectra of pesticides were collected after their adsorption on the AuNPs@MSF. The results showed that the concentration of 2,4-D, pymetrozine and thiamethoxam gave a good linear relationship with SERS intensity. Moreover, the designed SERS-based sensor (AuNPs@MSF) was stable for 3 months with ca. 3% relative standard deviation (RSD) and was applied successfully for the analysis of 2,4-D extraction from both environmental and food samples. The proposed SERS-based sensor was further validated by HPLC and showed satisfactory result (p > 0.05).
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Affiliation(s)
- Yi Xu
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, People's Republic of China
| | - Felix Y H Kutsanedzie
- Research and Innovation Center/Mechanical Engineering Department, Accra Technical University, Accra, Ghana
| | - Mehedi Hassan
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, People's Republic of China
| | - Jiaji Zhu
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, People's Republic of China
| | - Waqas Ahmad
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, People's Republic of China
| | - Huanhuan Li
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, People's Republic of China
| | - Quansheng Chen
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, People's Republic of China.
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Li W, Li C, Qi J, Chen X, Wang P, Luo J, Huang Z, Liang C. Hollow PtNi Nanochains as Highly Efficient and Stable Oxygen Reduction Reaction Catalysts. ChemistrySelect 2019. [DOI: 10.1002/slct.201803697] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Wenping Li
- Laboratory of Advanced Materials and Catalytic Engineering; School of Chemical Engineering; Dalian University of Technology; Dalian 116024 China
| | - Chuang Li
- Laboratory of Advanced Materials and Catalytic Engineering; School of Chemical Engineering; Dalian University of Technology; Dalian 116024 China
| | - Ji Qi
- Laboratory of Advanced Materials and Catalytic Engineering; School of Chemical Engineering; Dalian University of Technology; Dalian 116024 China
| | - Xiaozhen Chen
- Laboratory of Advanced Materials and Catalytic Engineering; School of Chemical Engineering; Dalian University of Technology; Dalian 116024 China
| | - Pan Wang
- Laboratory of Advanced Materials and Catalytic Engineering; School of Chemical Engineering; Dalian University of Technology; Dalian 116024 China
| | - Jingjie Luo
- Laboratory of Advanced Materials and Catalytic Engineering; School of Chemical Engineering; Dalian University of Technology; Dalian 116024 China
| | | | - Changhai Liang
- Laboratory of Advanced Materials and Catalytic Engineering; School of Chemical Engineering; Dalian University of Technology; Dalian 116024 China
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Li S, Wang Q, Song X, Bu Y. A green and general strategy for the synthesis of hollow Ag/CdS nanocomposites for superior SERS performance. CrystEngComm 2019. [DOI: 10.1039/c9ce00266a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this study, we developed a convenient, environmentally friendly approach for the fabrication of hollow Ag/CdS composites, which presented superior SERS performance.
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Affiliation(s)
- Shanshan Li
- School of Chemistry and Chemical Engineering
- Shandong University
- Jinan
- People's Republic of China
| | - Qi Wang
- School of Chemistry and Chemical Engineering
- Shandong University
- Jinan
- People's Republic of China
| | - Xinyu Song
- School of Chemistry and Chemical Engineering
- Shandong University
- Jinan
- People's Republic of China
| | - Yuxiang Bu
- School of Chemistry and Chemical Engineering
- Shandong University
- Jinan
- People's Republic of China
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Zarifi MH, Wiltshire BD, Mahdi N, Shankar K, Daneshmand M. Distinguishing between Deep Trapping Transients of Electrons and Holes in TiO 2 Nanotube Arrays Using Planar Microwave Resonator Sensor. ACS APPLIED MATERIALS & INTERFACES 2018; 10:29857-29865. [PMID: 29767958 DOI: 10.1021/acsami.8b03629] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
A large signal direct current (DC) bias and a small signal microwave bias were simultaneously applied to TiO2 nanotube membranes mounted on a planar microwave resonator. The DC bias modulated the electron concentration in the TiO2 nanotubes and was varied between 0 and 120 V in this study. Transients immediately following the application and removal of DC bias were measured by monitoring the S-parameters of the resonator as a function of time. The DC bias stimulated Poole-Frenkel-type trap-mediated electrical injection of excess carriers into TiO2 nanotubes, which resulted in a near-constant resonant frequency but a pronounced decrease in the microwave amplitude due to free electron absorption. When ultraviolet illumination and DC bias were both present and then stepwise removed, the resonant frequency shifted due to trapping-mediated change in the dielectric constant of the nanotube membranes. Characteristic lifetimes of 60-80, 300-800, and ∼3000 s were present regardless of whether light or bias was applied and were also observed in the presence of a hole scavenger, which we attributed to oxygen adsorption and deep electron traps, whereas another characteristic lifetime >8000 s was only present when illumination was applied, and is attributed to the presence of hole traps.
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Affiliation(s)
- Mohammad H Zarifi
- School of Engineering , University of British Columbia , Kelowna , British Columbia V1V 1V7 , Canada
| | - Benjamin D Wiltshire
- Department of Electrical and Computer Engineering , University of Alberta , Edmonton , Alberta T6G 2V4 , Canada
| | - Najia Mahdi
- Department of Electrical and Computer Engineering , University of Alberta , Edmonton , Alberta T6G 2V4 , Canada
| | - Karthik Shankar
- Department of Electrical and Computer Engineering , University of Alberta , Edmonton , Alberta T6G 2V4 , Canada
| | - Mojgan Daneshmand
- Department of Electrical and Computer Engineering , University of Alberta , Edmonton , Alberta T6G 2V4 , Canada
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Yang C, Chen Y, Liu D, Chen C, Wang J, Fan Y, Huang S, Lei W. Nanocavity-in-Multiple Nanogap Plasmonic Coupling Effects from Vertical Sandwich-Like Au@Al 2O 3@Au Arrays for Surface-Enhanced Raman Scattering. ACS APPLIED MATERIALS & INTERFACES 2018; 10:8317-8323. [PMID: 29441776 DOI: 10.1021/acsami.7b17228] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The development of ideal three-dimensional (3D) tailorable surface-enhanced Raman scattering (SERS) substrates with the properties of timesaving, large area, high throughput, single or few molecules detection, reproducibility, reusable ability, and high density of "hot spots" has been the mainstream challenge and the robust task. Here, we construct perpendicular sandwich-like Au@Al2O3@Au hybrid nanosheets (PSHNs) on the Al foil as a 3D flexible substrate for SERS. The design of 3D PSHNs incorporates several advantageous aspects for SERS to enhance the performance of plasmonic diamers via bifunctions of vertical Al2O3 nanosheets (NSs) including the nanoscaffold and nanobaffle plate effects. As a nanoscaffold, it increases the space utilization of Au-Au diamers, whereas as a nanobaffle, it forms densely homogeneous Au@Al2O3@Au nanojunctions by sub-4 nm thickness of Al2O3 NSs as the dielectric isolated layer for the double-sided exposure of slitlike surface plasmon resonance. The optimized PSHN substrate exhibits a fascinating SERS sensitivity with an experimental enhancement factor of 1012 and is able to detect rhodamine B at an extremely low concentration up to the limit of single or few molecules (10-18 M), as well as can be recycled without the loss of SERS enhancement via the simple impregnation process. These advantages will greatly facilitate the wider use of SERS in many fields.
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Affiliation(s)
- Chen Yang
- Institute for Frontier Materials , Deakin University , Locked Bag 2000 , Geelong , Victoria 3220 , Australia
| | - Ying Chen
- Institute for Frontier Materials , Deakin University , Locked Bag 2000 , Geelong , Victoria 3220 , Australia
| | - Dan Liu
- Institute for Frontier Materials , Deakin University , Locked Bag 2000 , Geelong , Victoria 3220 , Australia
| | - Cheng Chen
- Institute for Frontier Materials , Deakin University , Locked Bag 2000 , Geelong , Victoria 3220 , Australia
| | - Jiemin Wang
- Institute for Frontier Materials , Deakin University , Locked Bag 2000 , Geelong , Victoria 3220 , Australia
| | - Ye Fan
- Institute for Frontier Materials , Deakin University , Locked Bag 2000 , Geelong , Victoria 3220 , Australia
| | - Shaoming Huang
- Key Laboratory of Carbon Materials of Zhejiang Province, College of Chemistry and Materials Engineering , Wenzhou University , Wenzhou 325035 , P. R. China
| | - Weiwei Lei
- Institute for Frontier Materials , Deakin University , Locked Bag 2000 , Geelong , Victoria 3220 , Australia
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Xu ML, Gao Y, Han XX, Zhao B. Detection of Pesticide Residues in Food Using Surface-Enhanced Raman Spectroscopy: A Review. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2017; 65:6719-6726. [PMID: 28726388 DOI: 10.1021/acs.jafc.7b02504] [Citation(s) in RCA: 170] [Impact Index Per Article: 24.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Pesticides directly pollute the environment and contaminate foods ultimately being absorbed by the human body. Their residues contain highly toxic substances that have been found to cause serious problems to human health even at very low concentrations. The gold standard method, gas/liquid chromatography combined with mass spectroscopy, has been widely used for the detection of pesticide residues. However, these methods have some drawbacks such as complicated pretreatment and cleanup steps. Recent technological advancements of surface-enhanced Raman spectroscopy (SERS) have promoted the creation of alternative detection techniques. SERS is a useful detection tool with ultrasensitivity and simpler protocols. Present SERS-based pesticide residue detection often uses standard solutions of target analytes in conjunction with theoretical Raman spectra calculated by density functional theory (DFT) and actual Raman spectra detected by SERS. SERS is quite a promising technique for the direct detection of pesticides at trace levels in liquid samples or on the surface of solid samples following simple extraction to increase the concentration of analytes. In this review, we highlight recent studies on SERS-based pesticide detection, including SERS for pesticide standard solution detection and for pesticides in/on food samples. Moreover, in-depth analysis of pesticide chemical structures, structural alteration during food processing, interaction with SERS substrates, and selection of SERS-active substrates is involved.
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Affiliation(s)
- Meng-Lei Xu
- State Key Laboratory of Supramolecular Structure and Materials, Jilin University , Changchun 130012, PR China
| | - Yu Gao
- College of Agriculture, Jilin Agricultural University , Changchun 130118, PR China
| | - Xiao Xia Han
- State Key Laboratory of Supramolecular Structure and Materials, Jilin University , Changchun 130012, PR China
| | - Bing Zhao
- State Key Laboratory of Supramolecular Structure and Materials, Jilin University , Changchun 130012, PR China
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Wang L, Xu Y, Tan X, Tapas S, Zhang J. Aim and shoot: molecule-imprinting polymer coated MoO3 for selective SERS detection and photocatalytic destruction of low-level organic contaminants. RSC Adv 2017. [DOI: 10.1039/c7ra05547a] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A selective and high sensitive SERS substrate based on MoO3 nanorod was fabricated through the finely controllable coating of an ultrathin molecule-imprinting polymethacrylic acid layer.
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Affiliation(s)
- Lingzhi Wang
- Key Laboratory for Advanced Materials
- Institute of Fine Chemicals
- East China University of Science and Technology
- Shanghai 200237
- P. R. China
| | - Yin Xu
- Key Laboratory for Advanced Materials
- Institute of Fine Chemicals
- East China University of Science and Technology
- Shanghai 200237
- P. R. China
| | - Xianjun Tan
- Key Laboratory for Advanced Materials
- Institute of Fine Chemicals
- East China University of Science and Technology
- Shanghai 200237
- P. R. China
| | - Sen Tapas
- Centre for Materials Science
- Institute of Nanotechnology and Bioengineering
- School of Forensic and Investigative Sciences
- University of Central Lancashire
- Preston
| | - Jinlong Zhang
- Key Laboratory for Advanced Materials
- Institute of Fine Chemicals
- East China University of Science and Technology
- Shanghai 200237
- P. R. China
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