Spectral properties of siliceous nanocomposite materials

摘要

The optical properties of emulsion nanocomposite materials based on powder silicon are studied. The method of creation of a new type of emulsion composite, allowing the control of the spectral structure of transmitted electromagnetic radiation is reported. Two series of powder silicon, containing SiO_x (type 1) and SiO_x + SiN_x (type 2) depending on conditions were obtained and investigated. The results of FTIR-spectroscopy of powder silicon claimed the formation of SiO_2 and SiO_x phases on the surface layer of sample type 1 and the formation of nitride phase on the surface layer of sample type 2. The Raman Spectroscopy investigation of two series samples allowed to appreciate the dimensions of nanoparticles and phase structure in powder silicon. The Raman Spectra of samples type 1 and type 2 at the region of 500-600 CM~(-1) demonstrated that our powder silicon is nanocristalline silicon with dimension of d=10 ± 2 nm for type 1 and d = 13 ± 2 nm for type 2. We prepared emulsion composite samples with nanocristalline silicon; the test run of these materials was performed. The Spectra of optical density as well as the spectra of transmission and diffusive reflection into integrative sphere were measured for both types of samples. It was shown that the samples of type 2 are preferable as main protective ingredients of sunscreens.