Kinetics of particle coarsening at gold electrode/electrolyte solution interfaces followed by in situ scanning tunneling microscopy
Kinetics of particle coarsening at gold electrode/electrolyte solution interfaces followed by in situ scanning tunneling microscopy
复制标题
DOI：
10.1149/1.1836466
复制
发表时间：
1996-02-01
影响因子：
3.9
通讯作者：
Arvia, AJ
中科院分区：
文献类型：
--
作者：
Andreasen, G;Nazzarro, M;Arvia, AJ
柱状晶颗粒粗化动力学。在298 K下，在恒定电位下，将金电沉积物浸入含有0.5 M H2SO4的NaCl水溶液和普通的0.5 M H2SO4溶液中，随后进行原位扫描隧道显微镜（STM）顺序成像。对于这个系统，大的各向异性金颗粒以小颗粒为代价生长。根据表面扩散控制的粗化机制预测，对于任何预设生长方向测量的颗粒半径r的值随时间t（衰减时间）根据r（4）x t而增加。金颗粒的粗化发生时，金电沉积物高度的标准偏差没有显著变化。从STM成像数据得到的金原子的平均表面扩散系数与以前报道的电化学测量数据一致。
The kinetics of particle coarsening at columnar structured. gold electrodeposits immersed in aqueous NaCl containing 0.5 M H2SO4 and plain 0.5 M H2SO4 solutions at 298 K, at a constant potential, has been followed by in situ scanning tunneling microscopy (STM) sequential imaging. For this system large anisotropic gold particles grow at the expense of small ones. The value of r, the particle radius measured for any preset growth direction, increases with time t, the decay time, according to r(4) x t, as predicted by a surface diffusion-controlled coarsening mechanism. Coarsening of gold particles occurs without a significant change in the standard deviation of the gold electrodeposit height. The average surface diffusion coefficient of gold atoms derived from STM imaging data agrees with previously reported data derived from electrochemical measurements.