Ammonium Bicarbonate Reduction Route to Uniform Gold Nanoparticles and Their Applications in Catalysis and Surface-Enhanced Raman Scattering

A new protocol for the synthesis of nearly monodisperse gold nanoparticles with controllable size is described. The pathway is based on the reduction of AuCl4 by ammonium bicarbonate in the presence of sodium stearate under hydrothermal conditions. The particle sizes could be easily tuned by regulating the reaction conditions including precursor concentration, reaction temperature and growth time. A tentative explanation for the reduction and growth mechanism of uniform gold nanoparticles has been proposed. The as-prepared gold particles showed good catalytic activity for the reduction of 4-nitrophenol to 4-aminophenol by excess NaBH4, and a surface-enhanced Raman scattering （SERS） study suggested that the gold nanoparticles exhibited a high SERS effect on the probe molecule Rhodamine 6G.

为合成的一个新协议将近，有可控制的尺寸的 monodisperse 金牌 nanoparticles 被描述。小径在热水的条件下面面对钠硬脂酸盐由铵酸式碳酸盐基于 AuCl4 的减小。粒子尺寸能被包括先锋集中，反应温度和生长时间调整反应条件容易调节。一试验对减小和一致金 nanoparticles 的生长机制的解释被建议了。同样准备的金粒子证明为到由过量 NaBH4，和散布的提高表面的拉曼(重量的单位) 学习的 4-aminophenol 的 4-nitrophenol 的减小的好催化活动建议金 nanoparticles 在探查分子玫瑰精 6G 上展出了高重量的单位效果。