亚甲蓝
拉曼散射
材料科学
拉曼光谱
硼氢化钠
纳米颗粒
银纳米粒子
氧化剂
化学工程
动态光散射
扫描电子显微镜
纳米技术
分析化学(期刊)
化学
有机化学
光学
工程类
复合材料
催化作用
物理
光催化
作者
Marco Zannotti,Andrea Mario Rossi,Rita Giovannetti
出处
期刊:Coatings
[MDPI AG]
日期:2020-03-20
卷期号:10 (3): 288-288
被引量:36
标识
DOI:10.3390/coatings10030288
摘要
In this work, we prepared different morphologies of silver nanoparticles: nanosphere, triangular nanoplates, hexagonal nanoplates, and quasi-spherical shapes, through one-step synthesis. Hydrogen peroxide was used as the oxidizing agent during the reduction of silver nitrate by sodium borohydride, in the presence of tri-sodium citrate and poly-vinyl-pyrrolidone. The obtained silver nanoparticles were fully characterized by UV-Vis spectroscopy, Dynamic Light Scattering and Scanning Electron Microscopy, and successfully used as Surface Enhanced Raman Scattering (SERS) substrates. The effect of shape and morphology on the Raman scattering enhancement was evaluated by using methylene blue as target molecules. The Raman measurements demonstrated that the prepared substrates are reliable and sensitive with analytical enhancement factors, estimated to be around 105 with a concentration of methylene blue 1 μM. When triangular and hexagonal nanoplates were tested with different concentrations of analyte, they demonstrated a good linearity in Raman intensity with a good detection of methylene blue 0.1 μM.
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