纳米结构钴薄膜电极的制备及其异常红外性能研究

Preparation of Nanostructured Cobalt Thin Film Electrode and Its Abnormal Infrared Effects

用循环伏安电沉积法在玻碳基底上制备纳米结构钴薄膜，扫描电子显微镜研究结果表明，纳米结构钴薄膜主要由平均粒径为150nm的钴粒子组成，同时还有为数不多的粒径在400～500nm的钴粒子．以CO为探针分子，结合原位傅里叶变换红外反射光谱研究结果，发现所制备的纳米结构钴薄膜具有异常红外效应.吸附态CO发生异常红外吸收，谱峰增强了26．2倍，测得线型吸附态COL的Stark系数为77．5cm^-1·V^-1．

Nanostructured thin film of cobalt supported on glassy carbon （nm-Co/GC） was prepared by electrochemical deposition under cyclic voltammetric conditions. SEM studies illustrated that the Co film was composed of most irregularly small Co nanoparticles with an average size of 150 nm and a few large Co particles of diameter ranging from 400 nm to 500 nm. In situ FrIR spectroscopy employing CO adsorption as the probe reaction revealed that the nanostructured Co film exhibited abnormal infrared effects. The unique anomalous IR features of CO adsorbed on nm-Co/GC consist of the inversion of the COad IR bands, the significant enhancement of IR absorption of CO,d, and the large Stark effect as well as broadening of the COad IR bands （the FWHM of COL on nm-Co/GC is 8 cm^-1 larger than that on bulk Co）. The current investigation can extend the study of AIREs to nanomaterials of metals of iron family, and gain an insight into the origin of particular properties of nanomaterials.