Article
Chemistry, Analytical
Diana I. Meira, Marco S. Rodrigues, Joel Borges, Filipe Vaz
Summary: The extinction efficiency of noble metal nanoparticles, such as gold and silver, depends on their size and the dielectric surrounding them. By exploiting the Localized Surface Plasmon Resonance (LSPR) phenomenon, the composition and structure of these nanoparticles can be tailored to optimize their sensitivity to environmental changes. Incorporating these nanoparticles into solid support in the form of nanocomposite thin films enhances the robustness of LSPR sensing. In this study, bimetallic films composed of gold, silver, and their mixture in a titanium dioxide matrix were grown using reactive DC magnetron sputtering. The LSPR response and sensitivity of the films were tunable by thermal treatment at different temperatures. The bimetallic film with an Au/Ag atomic ratio of 1 exhibited the highest refractive index sensitivity, showcasing the potential of bimetallic film systems in enhancing LSPR sensing.
Article
Chemistry, Multidisciplinary
Luis Zamora-Peredo, Josue Ismael Garcia-Ramirez, Amado Carlos Garcia-Velasco, Julian Hernandez-Torres, Leandro Garcia-Gonzalez, Monserrat Bizarro, Adriana Baez-Rodriguez
Summary: This study fabricated ZnO microspheres and Ag/ZnO microspheres using hydrothermal and photodeposition methods, and found that the SERS substrate grown at 9.8 mM during 30 min showed the best SERS activity, with the ability to detect methylene blue at 10(-9) M concentration.
Article
Chemistry, Physical
Q. Sun, Q. W. Sun, Q. Y. Zhang, N. Zhou, L. Y. Zhang, Q. Hu
Summary: Chloride solutions were used to modify flower-like Ag-coated ZnO nanorod arrays, forming Ag-nanosphere decorated ZnO nanorod arrays for enhanced SERS study with improved molecule adsorption on Ag surface in the presence of chloride ions.
APPLIED SURFACE SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Sebin Augustine, Mahesh Saini, K. P. Sooraj, Basanta Kumar Parida, Sukriti Hans, Vivek Pachchigar, Biswarup Satpati, Mukesh Ranjan
Summary: Self-organized Ag nanoparticles arrays capped with Au layer are produced and show intermediate plasmonic properties. The optimized Au deposition decreases the interparticle gap and elongates the nanoparticles along the ripple direction, resulting in a larger redshift in the LSPR. The substrate exhibits good spatial uniformity and high SERS enhancement factors for both 532 nm and 785 nm lasers.
Article
Chemistry, Applied
Zhiyang Chen, Yue Sun, Jiyong Shi, Wen Zhang, Xinai Zhang, Xiaowei Huang, Xiaobo Zou, Zhihua Li, Ruicheng Wei
Summary: This study introduced an effective and sensitive SERS substrate for rapid detection of thiabendazole in fruit samples. The core-shell gold/silver nanorod (Au@Ag NRs) substrate showed excellent SERS effect, low detection limits, and high recovery rates, indicating its great potential for detecting fruit pesticides residues.
Correction
Chemistry, Physical
Xuan-Hung Pham, Eunil Hahm, Tae Han Kim, Hyung-Mo Kim, Sang Hun Lee, SangChul Lee, Homan Kang, Ho-Young Lee, Dae Hong Jeong, Hak Soo Choi, Bong-Hyun Jun
Summary: The author name and corresponding affiliation in the original version of this article were mistakenly labeled.
Article
Chemistry, Physical
O. E. Cigarroa-Mayorga, S. Gallardo-Hernandez, P. Talamas-Rohana
Summary: In this study, SERS substrates were synthesized by growing Au nanoparticles layer over porous anodized aluminum oxide support, with the strongest effect observed in a 50 nm Au precursor layer. The method is highly reproducible and has a homogeneous size distribution compared to other methods and substrates.
APPLIED SURFACE SCIENCE
(2021)
Article
Biophysics
Jin Wang, Dan Luo, Yandi Cai, Xiang-Ling Li, Hong-Yuan Chen, Jing-Juan Xu
Summary: In this study, an ingenious gold-silver Janus plasmonic nanoprobe was developed for the detection of intracellular hydrogen sulfide (H2S). The nanoprobe exhibited good anti-interference capability, low detection limit, and the ability to monitor real-time variations of H2S in cells. This work provides a promising tool for studying H2S-related biological processes.
BIOSENSORS & BIOELECTRONICS
(2022)
Article
Chemistry, Analytical
Matej Bubas, Ivana Fabijanic, Adriana Kendel, Snezana Miljanic, Maria Chiara Spadaro, Jordi Arbiol, Vesna Janicki, Jordi Sancho-Parramon
Summary: In plasmon-based devices, there is a tradeoff between the superb performance of Ag and the stability of Au in the choice of metal for the nanostructures. This study successfully created hybrid Au-Ag nanoislands with diverse morphology and tunable plasmon resonance using a large-area nanofabrication procedure. The Au-Ag nanoislands exhibited silver-like plasmonic properties and stability over a period of at least 5 months, with significantly higher SERS efficiency than Ag nanoislands. The study also provided insights for future sensor design and showed great potential for biomedicine sensing.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Optics
Wei Du, Shengnan Wei, Na Li, Zongshuo Hao, Yue Li, Mingli Wang
Summary: In this study, silver nanoparticles were modified on the facet of an optical fiber to prepare a fiber SERS substrate, which effectively enhanced Raman signals. The performance of the fiber SERS substrate was characterized in terms of uniformity, reproducibility, and stability. The experimental results demonstrated that the preparation method of the fiber SERS substrate enabled in situ and real-time detection, and portable Raman instruments could achieve simple and rapid analysis.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Optics
Xuemiao Zhao, Lianyu Zhang, Xin Lv, Jinhua Liu, Xinxin Liu, Yuting Zhang, Dong Zhang, Shuhong Li, Qingru Wang
Summary: By embedding in-situ gold particles into poly (vinyl alcohol) nanocomposite films, the fluorescence of rhodamine 6G can be enhanced with a maximum enhancement factor of 13. The localized surface plasmon resonance bands of the substrate have a significant impact on the enhancement factor. The substrate can also attenuate fluorescence quenching. Furthermore, the mechanism of surface enhanced fluorescence is demonstrated by simulating the local electric field distribution of the substrate using FDTD method.
Article
Chemistry, Analytical
Boris N. Khlebtsov, Andrey M. Burov, Andrey M. Zakharevich, Nikolai G. Khlebtsov
Summary: In this study, a simple and quantitative non-enzymatic detection method for hydrogen peroxide was developed using Au@Ag nanorods with embedded Raman active molecules. The sensitivity of nanoparticles with different morphologies was compared, and triangle core-shell nanoparticles exhibited the highest sensitivity. Additionally, a colorimetric strategy was applied to fabricate a simple indicator paper sensor for fast detection of hydrogen peroxide in liquids.
Article
Chemistry, Physical
Xinxin Li, Xiang Lin, Guoqiang Fang, Haoyu Dong, Junming Li, Shulin Cong, Li Wang, Shikuan Yang
Summary: This study introduces a technique to construct broadband and sensitive Au@Ag nanorod monolayer film over nanosphere substrates, achieving ultra-broad spectrum SERS activity with excellent reproducibility and a wider quantitative detection range. It paves the way for the design of ultra-sensitive and broadband SERS platforms.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Nanoscience & Nanotechnology
Sunghwan Jo, Ju Yeon Woo, Jun Ho Oh, Chang-Woo Song, Hee Min Yang, Chang-Soo Han
Summary: Researchers have developed a new type of stretchable dichroic film containing Au and Ag alloy nanoparticles, which exhibit unique optical properties. Additionally, they demonstrate the fabrication of a stretchable anticounterfeiting film and a flexible dichroic sculpture using this film.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Thi Thuy Nguyen, Fayna Mammeri, Souad Ammar, Thi Bich Ngoc Nguyen, Trong Nghia Nguyen, Thi Ha Lien Nghiem, Nguyen Thi Thuy, Thi Anh Ho
Summary: This study reports the formation of silver nanopetal-Fe3O4 poly-nanocrystals assemblies and their application as active substrates for Surface Enhanced Raman Spectroscopy (SERS). The engineered Fe3O4-Ag architectures exhibit plasmonic properties that offer a rough surface with plenty of hot spots for enhancing electrical fields, making them valuable for ultra-sensitive SERS sensing with magnetically assisted collection. Successful detection of trace amounts of Rhodamine 6G (R6G) down to 10(-10) M in water at room temperature was achieved.
