材料科学
硝基苯
纳米点
合金
化学工程
X射线光电子能谱
表面等离子共振
纳米颗粒
电化学
还原剂
金属
催化作用
纳米技术
电极
化学
有机化学
冶金
工程类
物理化学
作者
Shanmugam Manivannan,Juwon Jeong,Dong‐Ku Kang,Kyuwon Kim
标识
DOI:10.1002/elan.201700451
摘要
Abstract Efficient, stable, and low‐cost electrocatalysts for the degradation and sensing of environment pollutants are essential components of clean environment monitoring. Here we report, one‐step synthesis and characterization of 1–3 nm diameter sized bi‐metallic AuAg nanodots (NDs) embedded in amine functionalized silicate sol‐gel matrix (SSG) and its electrochemical studies toward nitrobenzene. The SSG was used as a reducing agent as well as stabilizer for the prepared mono‐ and bi‐metallic nanoparticles (NPs). From the HRTEM, STEM‐EDS and XPS analyses, the bi‐metallic AuAg NDs were identified as an alloy and not the mixtures of Au and Ag NPs. Characteristic surface plasmon resonance (SPR) band between the Au and Ag NPs SPR absorption region was noticed for the prepared AuAg NDs. The AuAg alloy NDs with different concentrations of Au and Ag (Au 25 Ag 75 , Au 50 Ag 50 and Au 75 Ag 25 NDs) modified electrodes exhibited synergistic electrocatalytic effect than did the Au and Ag NPs towards nitrobenzene reduction and detection. Together with ultra‐small size and exceptional colloidal stability features within these SSG‐AuAg NDs pave convenient way for nanotechnology‐based catalysts development and sensor applications.
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