Sharma Renu
LeRoy Eyring Center for Solid State Science, School of Materials, Arizona State University, Tempe, Arizona 85287-9506, USA.
Microsc Res Tech. 2009 Mar;72(3):144-52. doi: 10.1002/jemt.20667.
Environmental transmission or scanning transmission electron microscope is ideally suited to observe gas solid interactions at nanoscale. It is shown that the time and temperature resolved data, obtained from in situ observations, can be used to obtain reaction rates and understand the kinetics of the processes. Low or high magnification images provide the change in length, area or volume with time at constant temperature and pressure conditions during nitridation of Cu-Cr thin films, deposition of Au particles, growth of Si nanowire and carbon nanotubes. Effect of electron beam is estimated by making observations with and without constant electron beam exposure. Quantitative electron energy loss spectroscopy is employed to measure the reduction rate of Ce(+4) in pure ceria, mixed oxides (ceria-zirconia) and catalyst (Rh-ceria-zirconia) powders.
环境透射或扫描透射电子显微镜非常适合观察纳米尺度下的气固相互作用。结果表明，通过原位观察获得的时间和温度分辨数据可用于获得反应速率并理解过程的动力学。低倍或高倍图像提供了在Cu-Cr薄膜氮化、Au颗粒沉积、Si纳米线和碳纳米管生长过程中，在恒定温度和压力条件下长度、面积或体积随时间的变化。通过在有和没有恒定电子束照射的情况下进行观察来估计电子束的影响。采用定量电子能量损失谱来测量纯氧化铈、混合氧化物（氧化铈-氧化锆）和催化剂（Rh-氧化铈-氧化锆）粉末中Ce(+4)的还原速率。
