Papers by Author: Seon Hwa Kim

Abstract: ITO monolayer and ITO/Ag/ITO multilayer thin films are prepared by D.C. magnetron sputtering method, optical and electrical properties were estimated with different crystalline properties and microstructures. The coated Ag layer thickness was around 50
, and the surface of ITO/Ag/ITO thin film had the very fine island morphology. The growth of columnar phase was inhibited, and most of phases were amorphous. The carrier concentration increased above 10 times because of the effect of Ag layer, and the observed sheet resistance gave much lower value of below 4 / compared to that of coated crystalline ITO thin film that was 10 / , and the transmittance was 80%.

Abstract: TiO2 thin films were prepared by RF sputtering on Si wafer to investigate hydrophilicity and bactericidal effects by using AFM, XRD, standard plate count method and wetting angle measurement. Experimentally, the survival rate of E. coli was above 74% and the wetting angle of water for the 30 min UV illuminated films was 4.2o. It was found that the bactericidal efficiency was closely related to the large specific surface area caused by the roughness, however, hydrophilicity was governed by the surface defective sites rather than the roughness.