Article
Food Science & Technology
Lixin Ma, En Han, Limei Yin, Qian Xu, Caixia Zou, Junwen Bai, Wei Wu, Jianrong Cai
Summary: A label-free SERS sensor was developed using bimetallic core-shell Au@Ag nanoparticles to simultaneously detect acetamiprid and thiram. The SERS substrates were synthesized by a seed-mediated growth method and showed satisfactory linearity in the detection of mixed pesticides. The method demonstrated excellent recovery rates and has the potential to be used for on-site detection of multiple contaminants in food safety when combined with a portable Raman spectrometer.
Article
Nanoscience & Nanotechnology
Li Sun, Chunlai Cao, Yuan Zhi, Yuejin Shan, Hua Zhang, Binlin Dou, Lixin Zhang, Weijia Huang
Summary: In this study, controllable morphologies of Au-Ag nanoparticles (NPs) were successfully synthesized and used as SERS-active substrates for the detection of trace thiram. The morphological transformation of Au-Ag NPs was achieved through the element diffusion theory, providing a strategy for the morphology control of complex Au-Ag NPs. The optimized morphologies of Au-Ag NPs exhibited superior sensitivity and reproducibility, making them a potential candidate for trace analyte detection in the field of food safety and environmental protection.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Applied
Jiale Zhang, Caijun Wu, Ruo Yuan, Jian-An Huang, Xia Yang
Summary: This study reports a subtle surface-enhanced Raman scattering (SERS) substrate for detecting the dithiocarbamate fungicide Thiram. By controlling the inter-particle spacing of gold-silver-gold nanoparticles, a remarkable enhancement of Raman signal and stability was achieved. This method holds potential for rapid assessment and identification of pesticides on foods.
Article
Nanoscience & Nanotechnology
Yanfen Wang, Shuai Ma, Hai Yu, Yin Liu, Juan Gao, Lei Yang, Miao Zhang, Gang He, Zhaoqi Sun
Summary: It was found that TiO2 nanosheet array as a supporting substrate can lead to a uniform distribution of Ag nanoparticles and enhance the SERS signals, resulting in better detection performance. Compared with other nanostructures, the Ag/TiO2(S) array exhibited a higher enhancement factor and good reproducibility.
Article
Materials Science, Ceramics
Ton Nu Quynh Trang, Tieu Tu Doanh, Lam Quang Vinh, Vu Thi Hanh Thu
Summary: The study presents the design and fabrication of an Ag/TiO2 NRs heterostructure for ultrasensitive SERS detection of molecules like R6G and efficient degradation of molecules, showing promising photocatalytic performance and self-cleaning effect.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Analytical
Dacheng Xia, Panpan Jiang, Zhiwei Cai, Rui Zhou, Bo Tu, Nan Gao, Gang Chang, Hanping He, Yunbin He
Summary: The Ag NCs/PDMS substrate fabricated by self-assembly method showed high SERS activity and was successfully used for quantitative detection of thiram. It also demonstrated excellent detection ability for thiram residues on apple samples.
Article
Chemistry, Physical
Haoran Wu, Jingjing Wang, Qiong Yang, Shaoxiong Qin, Zixiu Li, Yang Zhang, Jiaqi Pan, Chaorong Li
Summary: This study presents the synthesis of Ag@Ga-doped ZnO core-shell nanoparticles (Ag@n%Ga-ZnO CSNPs) using a solvothermal method and defect engineering technology. The nanoparticles show both local electromagnetic enhancement and efficient charge transfer enhancement, enabling ultrahigh detection sensitivity, stability, and repeatability in surface-enhanced Raman scattering (SERS) detection. The Ag@2.6%Ga-ZnO CSNPs exhibit good linearity in the detection range of 10-6 to 10-12 M for the dye analyte rhodamine 6G (R6G), with a limit of detection of 10-12 M. The nanoparticles also demonstrate excellent signal repeatability and catalytic degradation of organic dye and pesticide molecules.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Tao He, Shuang Xiong, Haobin Han, Dalei Wang, Yueyue Wang, Chaoqing Dai, Wei Liu
Summary: The composite structure of GO and Ag is widely used as SERS substrates due to its superior sensing ability. However, the influence of external environment, such as light, on the stability of this composite structure is not well-studied. In this study, we prepared Ag microspheres on glass slides and spin-coated them with GO as SERS strips for the detection of organic molecules R6G. The Ag/GO composite structure showed better stability under light irradiation compared to Ag substrate, and GO was found to effectively protect Ag from oxidation.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Review
Chemistry, Analytical
Jan Jehlicka, Howell G. M. Edwards, Aharon Oren
Summary: This review discusses the application of Raman spectroscopy in studying violet and brown pigments produced by microorganisms. Raman spectroscopy is a widely appreciated analytical tool in the field of microbiology and chemistry, and its recent developments have opened up new possibilities for studying microbial colonization in natural geobiological systems.
TRAC-TRENDS IN ANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Analytical
Kaiqiang Wang, Da-Wen Sun, Hongbin Pu, Qingyi Wei
Summary: This study presents a simple method to fabricate a high-performance SERS chip with a high-density nanoparticle array, demonstrating highly reproducible and sensitive SERS enhancement effects for nondestructive detection of thiram on fruit peels. The use of acrylic polymer tape and PET film in the structure design endows the SERS chip with flexible and robust features.
Article
Materials Science, Multidisciplinary
Rahul Prajesh, Rakesh Kumar Saini, Ashok Kumar Sharma, Ajay Agarwal
Summary: Thiram is a fungicide with health-related issues when consumed regularly. Monitoring its presence in food and vegetables is crucial. This study aims to develop a low-cost and simple label-free SERS active substrate for detecting low-level concentrations of Thiram.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Chemistry, Analytical
Mohammad Jafari, Mitra Mousavi, Kamal Shirzad, Monireh-Alsadat Hosseini, Alireza Badiei, Pouran Pourhakkak, Jahan B. Ghasemi
Summary: The Ag-deposited TiO2 nanotube arrays (TNTA/Ag) were successfully prepared by decorating Ag nanoparticles on anodized TiO2 nanotubes, serving as a probe for vitamin B12 detection. The probe exhibited superior detection sensitivity and reproducibility, with the ability to self-clean and be reused. Detection of vitamin B12 in real pharmaceutical samples further confirmed the reliability of the TNTA/Ag SERS probe.
MICROCHEMICAL JOURNAL
(2022)
Article
Chemistry, Analytical
Li Xiao, Shaolong Feng, Marti Z. Hua, Xiaonan Lu
Summary: A flexible nanocomposite composed of bacterial cellulose (BC) and gold nanoparticles (AuNPs) was developed as a SERS substrate for the sensitive and rapid detection of thiram residues on apple surface. The SERS substrate showed a high enhancement factor and a good linear correlation, with a detection limit satisfying regulatory requirements. This BC-based SERS substrate demonstrated excellent analytical performance and is suitable for the quantitative analysis of pesticides on food surfaces.
Article
Chemistry, Physical
Maofeng Zhang, Haoran Sun, Xin Chen, Hongyang Zhou, Liangzhong Xiong, Wei Chen, Zihai Chen, Zhiyong Bao, Yucheng Wu
Summary: A sensitive solid semiconductor-based surface-enhanced Raman spectroscopy (SERS) substrate was successfully synthesized with improved performance for the detection of multiple organic pollutants. The optimized TiO2-Ag-GO substrate showed enhanced signal reproducibility, longer-term stability, and higher detection sensitivity, with potential for various practical applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Applied
Nisar Hussain, Hongbin Pu, Da-Wen Sun
Summary: The developed method using MCO-modified Au@AgNPs nanocomposites showed high sensitivity and significant enhancement of Raman scattering for detecting fungicide residues in pear fruit extracts. It can be employed as a SERS active platform for rapid assessment of trace contaminants of agrochemicals in agriculture production.