Challenges associated with in-situ TEM in environmental systems: The case of silver in aqueous solutions
Challenges associated with in-situ TEM in environmental systems: The case of silver in aqueous solutions
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DOI：
10.1016/j.ultramic.2012.03.012
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发表时间：
2012-05-01
期刊：
影响因子：
2.2
通讯作者：
Dillon, Shen J.
中科院分区：
文献类型：
--
作者：
Noh, Kyong Wook;Liu, Yin;Dillon, Shen J.
这项工作表征了电子束在环境透射电子显微镜下诱导银微结构演变的影响。在不同的实验条件下，观察到银在光束下的溶解和沉积两种不同的过程。前者主要是由一次光束引起的电离引起的，后者主要是由衬底中产生的二次电子对溶液中Ag+离子的还原引起的。相对速率随溶液中银的活度和束流密度而变化。一个基于化学动力学的简单模型将系统的一般响应描述为束电流密度和溶液组成的函数。(C) 2012 Elsevier B.V.版权所有
This work characterizes the effects of an electron beam on inducing microstructural evolution in Ag during environmental transmission electron microscopy. Two different processes, dissolution of Ag and deposition of Ag under the beam, were observed under different experimental conditions. The former primarily results from ionization induced by the primary beam and the latter primarily results from reduction of Ag+ ions in solution by secondary electrons generated in the substrate. The relative rates vary with the activity of silver in solution and beam current density. A simple model based on chemical kinetics describes the general response of the system as a function of beam current density and solution composition. (C) 2012 Elsevier B.V. All rights reserved.