Influence of coating pressure on structure and optical properties of GDP films

Using low pressure plasma polymerization technology, glowing discharge polymer films were fabricated at different coating pressures. Surface roughness, chemistry structure and optical properties were measured by atomic force microscopy, infrared absorption spectroscopy and ultraviolet-visible transmittance spectroscopy, respectively. The results show that as the coating pressure increases, the surface roughness of the GDP film and content of the olefinic carbon bonds decrease, while the hydrogen and SP2 CH2 concentration and the optical band gap of GDP films increases.