Abu Bakar Norhayati, Shapter Joseph G
Australian Institute for Bioengineering and Nanotechnology, University of Queensland, St. Lucia, Brisbane, Queensland, 4072 Australia.
Institute of Microengineering and Nanoelectronic, Universiti Kebangsaan Malaysia, UKM Bangi, 43600, Selangor, Malaysia.
Heliyon. 2023 Mar 20;9(3):e14686. doi: 10.1016/j.heliyon.2023.e14686. eCollection 2023 Mar.
Strategies for synthetic control of anisotropic metal nanostructures have grown in recent years in part due to their great potential for application as surface-enhanced Raman scattering (SERS) sensing substrates. It has been shown that SERS using silver substrates is a powerful tool for identification and qualification of trace chemical analysis on the basis of their unique molecular vibrations. In this work, we synthesized star-shaped silver nanostructures and fabricated SERS substrates to use the SERS enhancement of the Raman signal to detect neonicotinoid pesticides. These silver nanostar substrates were prepared by assembling the nanostar particles on a glass substrate surface using a self-assembly technique with various layers of silver nanostars film. The silver nanostar distribution on the solid substrate surface was found to have good reproducibility, reusability and were a stable SERS substrate giving SERS enhancements for pesticide detection at concentrations as low as 10 mg/ml. The distribution of these silver nanostars on the surface allowed excellent reproducibility of the detection with a low relative standard derivation (RSD) of SERS intensity of 8%. This work potentially builds a platform for an ultrasensitive detector where samples can be probed with little to no pre-processing and a range of pollutants can be detected at very low levels.
近年来，各向异性金属纳米结构的合成控制策略不断发展，部分原因在于其作为表面增强拉曼散射（SERS）传感基底具有巨大的应用潜力。研究表明，基于银基底的SERS利用其独特的分子振动，是一种用于痕量化学分析鉴定和定量的强大工具。在本工作中，我们合成了星形银纳米结构并制备了SERS基底，以利用拉曼信号的SERS增强来检测新烟碱类农药。这些银纳米星基底是通过自组装技术，将纳米星颗粒组装在玻璃基底表面，形成具有不同层数的银纳米星薄膜而制备的。发现固体基底表面的银纳米星分布具有良好的重现性、可重复使用性，并且是一种稳定的SERS基底，能够在低至10 mg/ml的浓度下对农药检测实现SERS增强。这些银纳米星在表面的分布使得检测具有出色的重现性，SERS强度的相对标准偏差（RSD）低至8%。这项工作有望构建一个超灵敏探测器平台，在此平台上，样品几乎无需预处理即可进行探测，并且能够检测到极低水平的多种污染物。
