纳米结构Pt膜上CO吸附的异常红外效应机理研究

Studies on the abnormal IR effects for CO adsorption on nanostructured Pt thin films

CO吸附在经方波电势处理后的纳米结构Pt金属膜电极上可观察到异常红外效应 (AIREs) .在实验基础上用粒子间的相互作用和电子 空穴衰减机理分析、模拟了AIREs ,表明Pt金属表面的纳米岛状结构增强了CO分子间及CO分子与纳米结构表面的相互作用 ,电子 空穴衰减引起的能量转移和粒子间相互作用的增强可以导致异常红外吸收谱线变化特征的出现 .

The abnormal IR effects(AIREs) of the adsorption of CO on electrodes made of Pt nanostructured thin films generated in square wave potential treatment were observed. Based on the experimental results, the AIREs were analysed and simulated by taking into consideration of the interparticle interaction and the electron - hole damping. The results illustrate that the islanded narrostructured Pt surfaces give rise to the interactions between CO molecules as well as between CO molecules and nanostructured Pt surface. The energy transfer due to electron-hole damping and the enhancement of interparticle interaction are the important cause of the changes of IR absorption spectra.