One-step Synthesis of AuAg Alloy Nanodots and its Electrochemical Studies towards Nitrobenzene Reduction and Sensing,Electroanalysis

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One-step Synthesis of AuAg Alloy Nanodots and its Electrochemical Studies towards Nitrobenzene Reduction and Sensing
Electroanalysis ( IF 2.7 ) Pub Date : 2017-11-03 , DOI: 10.1002/elan.201700451
Shanmugam Manivannan ₁ , Juwon Jeong ₁ , Dong-Ku Kang ₁ , Kyuwon Kim ₁

Affiliation

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 (Au25Ag75, Au50Ag50 and Au75Ag25 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.

中文翻译：

AuAg合金纳米点的一步合成及其对硝基苯还原和传感的电化学研究

用于环境污染物降解和传感的高效、稳定和低成本的电催化剂是清洁环境监测的重要组成部分。在这里，我们报告了嵌入胺官能化硅酸盐溶胶-凝胶基质 (SSG) 中的 1-3 nm 直径双金属 AuAg 纳米点 (ND) 的一步合成和表征及其对硝基苯的电化学研究。SSG 用作制备的单金属和双金属纳米粒子 (NPs) 的还原剂和稳定剂。从 HRTEM、STEM-EDS 和 XPS 分析中，双金属 AuAg ND 被确定为合金，而不是 Au 和 Ag NP 的混合物。对于制备的 AuAg NDs，注意到 Au 和 Ag NPs SPR 吸收区域之间的特征表面等离子体共振 (SPR) 带。具有不同浓度 Au 和 Ag (Au25Ag75, Au50Ag50 和 Au75Ag25 NDs) 修饰的电极在硝基苯还原和检测方面表现出比 Au 和 Ag NPs 的协同电催化作用。连同这些 SSG-AuAg ND 中的超小尺寸和出色的胶体稳定性特征，为基于纳米技术的催化剂开发和传感器应用铺平了道路。

更新日期：2017-11-03

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