Pd微电极阵列表面纳米薄膜的方波电位制备及其特殊的红外性能

制备了单根可寻址Pd微电极阵列,运用方波电位法对阵列上每根Pd微电极处理不同时间,诱导生成一系列不同纳米结构的Pd薄膜.以CO为探针分子,结合原位显微傅里叶变换红外反射光谱进行表面组合电化学研究,一次性地获得CO吸附在不同纳米结构Pd薄膜上的红外光谱.观察到随方波电位法处理时间的逐步增加,桥式吸附态CO的红外光谱峰从正常吸收光谱到类Fano光谱,再到异常红外光谱的转变过程.结合扫描电子显微镜观察纳米薄膜的形貌,发现不同红外光谱特征都对应着特定的纳米结构.

Preparation of Nanostructured Films on Surface of Pd Microelectrode Array by Square Wave Potential and Their Anomalous IR Properties

An individually addressable array of Pd microelectrodes was combined with in situ microscope FTIR reflection spectroscopy in the current paper to carry out surface combinatorial studies. Pd film of different nanostructures on the array was prepared electrochemically by applying the method of square wave potential. The electrochemical behavior and surface structure of the Pd film were investigated respectively by using cyclic voltammetry and scanning electron microscopy. It revealed that, through the surface combinatorial studies, with the increase of treatment time of the square wave potential, the spectral IR characteristics of bridge bonded CO on the array was transformed successively from normal absorption band to Fano-like spectral line shape, and finally to abnormal IR features. The results demonstrate that the anomalous IR properties of Pd thin film depend strongly on the nanostructure of the film.