METAL-OXIDE THIN-FILMS CONTAINING AU NANO-PARTICLES PREPARED WITH GAS-DIFFUSION METHOD

Au particles dispersed thin metal oxide films were prepared from precu rsor films containing HAuCl4 with H2S gas diffusion method. HAuCl4 was uniformly dissolved in the films as promoted by hydroxypropyl cellulo se (HPC). The mechanism of the Au particle formation was studied. It w as found that HAuCl4 was converted directly to Au metal particles upon contacting with H2S gas. Au particles generated by this method were c haracterized with small particle size, sharp size distribution and hig h volume fraction in the films. The surface plasma resonance absorptio n of Au particles shifted to longer wavelength when TiO2 component was introduced in the matrix.