Article
Chemistry, Physical
Wenlong Liao, Kunpng Liu, Yangjie Chen, Jianping Hu, Ya Gan
Summary: The article reports a facile method to fabricate Au-Ag bimetallic nanoparticles decorated silicon nanowires as 3D SERS substrates, and investigates the effects of Au-Ag bimetallic nanoparticles size and composition ratios on SERS performance through experiments and theoretical simulations. The prepared 3D SERS substrate shows higher SERS enhancement factor and oxidation resistance ability, making it potentially suitable for ultrasensitive detection of trace analytes.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Biochemistry & Molecular Biology
Maria Jose Lo Faro, Ileana Ielo, Dario Morganti, Antonio Alessio Leonardi, Sabrina Conoci, Barbara Fazio, Giovanna De Luca, Alessia Irrera
Summary: This paper reports on the decoration of ultrathin silicon nanowires with gold nanoparticles for surface-enhanced Raman scattering applications. The results show that the decorated nanowires exhibit high enhancement effects after different surface functionalizations.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Physical
Mehdi Rahmani, Sonia Amdouni
Summary: CuNPs were chemically deposited on SiNWs using an electroless dipping method. SiNWs were fabricated by a one-step Ag-assisted chemical etching method. SEM images clearly showed the formation of aligned SiNWs perpendicular to Si surface and their decoration by CuNPs. Raman and FTIR spectroscopies detected new chemical bonds on SiNWs surface indicating chemical reactions between Cu ions and SiNWs. PL spectroscopy showed a remarkable enhancement in the PL intensity of Cu-decorated SiNWs due to the plasmonic effect of CuNPs and radiative transitions of Cu. Cu-decorated SiNWs exhibited good rectifying behavior in the fabricated Schottky diode.
Article
Chemistry, Multidisciplinary
Galia Pozina, Carl Hemmingsson, Natalia Abrikossova, Elizaveta I. Girshova, Erkki Lahderanta, Mikhail A. Kaliteevski
Summary: This study investigates the optical spectroscopy properties of hybrid structures composed of colloidal Ag nanoparticles and planar GaN nanowires. A new emission line at 3.36 eV is observed near the Ag nanoparticles. The experimental results are explained using the Frohlich resonance approximation model and the effective medium approach.
Article
Chemistry, Physical
Dubravko Risovic, Hrvoje Gebavi, Mile Ivanda
Summary: Nanostructured materials play a significant role in applications such as surface-enhanced Raman scattering (SERS) due to their optical properties. The fractal dimension and lacunarity have a profound influence on SERS enhancement. The percolation theory explains the strong enhancement observed at a fractal dimension of approximately 2.54.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
Kais Daoudi, Krithikadevi Ramachandran, Hussain Alawadhi, Rabah Boukherroub, Elhadj Dogheche, My Ali El Khakani, Mounir Gaidi
Summary: The study focused on developing a SERS sensor to detect the SARS-CoV-2 spike protein, using silicon nanowires (SiNWs) substrate and plasmonic silver nanoparticles (AgNPs) decoration to enhance sensing. The results indicated promising potential for SERS as an innovative tool in early infection diagnosis.
SURFACES AND INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Kerong Wu, Kui Lai, Junfeng Chen, Jie Yao, Shuwen Zeng, Tao Jiang, Hongjie Si, Chenjie Gu, Junhui Jiang
Summary: In this study, a novel surface-enhanced Raman scattering (SERS) immunostructure utilizing Ag nanoparticle/porous carbon (Ag NP/PorC) films as the immunosubstrate and Ag nanocrystals (Ag NCs) as the immunoprobes is presented for ultralow level prostate-specific antigen (PSA) detection. The results demonstrate that the proposed SERS-type immunoassay is highly sensitive and selective to a wide range of PSA concentrations. Moreover, the method successfully detects PSA levels in human serum with a high consistency compared to the chemiluminescence method, with a recovery rate above 90%. Overall, this SERS-type immunoassay provides a promising method for the early diagnosis of prostate cancer.
Article
Polymer Science
Mayra Matamoros-Ambrocio, Enrique Sanchez-Mora, Estela Gomez-Barojas
Summary: SERS substrates were synthesized using spherical silver nanoparticles adsorbed on Si substrate and opal of PMMA microspheres. Higher concentration of Ag-NPs in the composites led to alteration in the periodicity of PMMA opals and decreased intensity and broadened PBG. The performance evaluation using methylene blue as a probe molecule showed higher enhancement factor (EF) with increased Ag-NP concentration. The EFs of single Ag-NP were nearly 10-fold higher than those of Ag/PMMA composites possibly due to the porosity of PMMA microspheres and the metal-dielectric surface interaction.
Article
Optics
Hind I. Murad, Dina Ahmed Kafi
Summary: This work focuses on the production of Ag@TiO2 nanoparticles/PS ultra-high sensitivity for humidity using laser ablation. The structural, morphological, and optical properties of silicon bulk and PS layer are studied in detail.
Article
Materials Science, Multidisciplinary
Krithikadevi Ramachandran, Soumya Columbus, Siva Chidambaram, Kais Daoudi, My Ali El Khakani, Mounir Gaidi
Summary: Hybrid nanostructures based on SiNWs decorated with Au NPs were developed for label-free protein molecule detection. Through optimization and testing, the sensor achieved high sensitivity for detecting H1N1 viral protein at femto-molar concentrations.
Article
Biochemical Research Methods
Xiaoli Xin, Yi Li, Lu Yu, Weihua Li, Jiansheng Li, Rui Lu
Summary: Ag@C core-shell nanoparticles were prepared by a low-temperature heating-stirring method and subsequently modified with polyethyleneimine (PEI). Ag@C@Ag hybrid nanoparticles were then fabricated with 24-nm Ag NPs attached, demonstrating excellent optical properties for surface-enhanced Raman scattering (SERS) applications. Finite-difference time-domain simulations indicated that the signal enhancement was attributed to the Ag NPs, hot spots, and external assembly, allowing for ultrasensitive spectral analysis.
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2021)
Article
Optics
Tristan Madeleine, Giampaolo D'alessandro, Malgosia Kaczmarek
Summary: Plasmonic resonances in sub-wavelength cavities formed by metallic nanocubes separated from a metallic surface by a dielectric gap have potential applications in spectroscopy, enhanced light emission, and optomechanics. However, the limited choice of metals and size constraints restrict the optical wavelength range of these applications.
Article
Biochemistry & Molecular Biology
Fangyi Qin, Rongjun Liu, Qiong Wu, Shulong Wang, Fa Liu, Qingmin Wei, Jiayao Xu, Zhihui Luo
Summary: In this study, Ag-CaCO3 nanocomposites were synthesized using silver nitrate as the precursor solution based on calcium carbonate nanoparticles (CaCO3 NPs). The properties of Ag-CaCO3 nanocomposites were studied by various technologies, and it was found that they exhibited high SERS activity and could be used for analyzing pesticide residues and detecting toxic and harmful molecules, contributing to environmental protection.
Article
Chemistry, Multidisciplinary
Edita Daublyte, Agne Zdaniauskiene, Martynas Talaikis, Audrius Drabavicius, Tatjana Charkova
Summary: A simple microwave-assisted synthesis method was used to prepare silver-core silica-shell nanoparticles with an average diameter of 90 nm in two steps. The core-shell nanoparticles demonstrated good stability and could be stored for two months at 8-10 degrees Celsius in the dark.
NEW JOURNAL OF CHEMISTRY
(2021)
Article
Chemistry, Physical
Q. Sun, Q. Y. Zhang, N. Zhou, L. Y. Zhang, Q. Hu, C. Y. Ma
Summary: This study investigated the extinction spectra and local electromagnetic fields of Ag-decorated ZnO nanorods using the FDTD method, revealing the significant impact of different parameters on Raman enhancement. The findings are valuable for the design and optimization of 3D SERS substrates.
APPLIED SURFACE SCIENCE
(2021)