透光导电金属及氧化铂半导体薄膜的制备与表征

Synthesis and Characterization of Optical Transmissive, Electrically Conductive Platinum and Platinum Oxide Semiconductor Thin Films

通过PPh_3对“非保护型”铂金属纳米簇进行表面修饰,并将其萃取至甲苯中,制备的PPh_3修饰的Pt金属钠米簇于空气中可自发地在玻璃表面生长出均匀透光的金属钠米簇薄膜.该金属钠米簇薄膜经空气中加热处理后可转化为透光导电的氧化铂半导体薄膜.考察了金属钠米簇薄膜生长过程中UV-vis吸收光谱的变化.采用SEM和TEM等方法,表征了纳米簇的粒径及膜的多孔结构,由此解释了其透光原因.研究了薄膜的导电性与处理条件的关系,并采用XPS表征了处理过程中的物质变化.初步探索了PPh_3-Pt纳米簇自发成膜过程的机理,确定了氧气在此过程中的重要作用.

The surface of 'unprotected' nanoscale platinum clusters (1 - 3nm) were modified with PPh3, and the obtained PPh3 - Pt nanoclusters were extracted into toluene. The resulted colloidal dispersion of the PPh3 -Pt nanoclusters can spontaneously form homogeneous, optical transmissive thin films on the surface of glass under air. After heated under air at 400℃, the platinum nanocluster thin films were transformed to optical transmissive, electrically conductive platinum oxide semiconductor thin films. The film formation process was followed by UV - vis spectra measurements. The morphological structure of the films was characterized by using SEM and TEM. The relationship between the electrical conductivity of the thin films and the conditions for the film treatments was studied. Changes in the components of the thin films treated under different conditions were studied by using XPS. It has been revealed that oxygen dissolved in the colloidal solution takes an important role in the film formation process of the PPh3 - Pt nanoclusters.