Department of Chemistry, Faculty of Science, The M. S. University of Baroda, Sayajigunj, Vadodara 390002, India.
Materials Design Division, Faculty of Materials Science and Engineering, Warsaw University of Technology, 141 Wołoska Str., 02-507 Warsaw, Poland.
Int J Biol Macromol. 2023 Dec 31;253(Pt 7):127444. doi: 10.1016/j.ijbiomac.2023.127444. Epub 2023 Oct 14.
In this work, nanostructures comprising silver nanoparticles supported on a wrinkled chitosan matrix (Ag@Ch) were successfully synthesized by a simple aging process at room temperature for four days through self-assembly. Chitosan, a natural polysaccharide was used as a support as well as a reducing agent for the formation of Ag nanostructures and the creation of hotspots for SERS activity. The fabricated Ag@Ch nanostructures were characterized by several spectroscopic techniques and were used as a surface-enhanced Raman scattering (SERS) substrate. The effect of wet, dry, and liquid samples on the SERS enhancement has been studied and was found to be effective for sensing Methylene blue, Crystal Violet, and p-Nitrophenol with detection limits of 3.8, 8.1, and 8.2 ppb respectively. The SERS enhancement of the Ag@Ch was attributed to the combination of both electromagnetic (EM) and chemical effects (CE). Density functional theory (DFT) calculations were used to explain the observed surface enhancement. Good agreement was observed between the experimental and simulated spectra.
在这项工作中，通过简单的室温老化过程，成功地在皱缩壳聚糖基质上合成了包含银纳米粒子的纳米结构（Ag@Ch），该过程通过自组装在四天内完成。壳聚糖是一种天然多糖，它既可以作为银纳米结构形成的支撑物，也可以作为还原剂，同时还可以产生表面增强拉曼散射（SERS）活性的热点。所制备的 Ag@Ch 纳米结构通过多种光谱技术进行了表征，并被用作 SERS 基底。研究了湿、干和液体样品对 SERS 增强的影响，发现它对亚甲基蓝、结晶紫和对硝基苯酚的检测限分别为 3.8、8.1 和 8.2 ppb。Ag@Ch 的 SERS 增强归因于电磁（EM）和化学效应（CE）的结合。使用密度泛函理论（DFT）计算来解释观察到的表面增强。实验和模拟谱之间观察到良好的一致性。
