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Articles by P. Cao
Total Records ( 2 ) for P. Cao
  P. Cao , D.X. Zhao , D.Z. Shen , J.Y. Zhang , Z.Z. Zhang and Y. Bai
  Successful synthesis of room-temperature ferromagnetic semiconductors, Cu-codoped ZnCoO films are obtained by sol–gel method. It is found that the essential ingredient in achieving room-temperature ferromagnetism is Cu-codoping. By Hall-effect measurement a p-type conductivity was observed for the Cu-codoped films, the hole concentration increases with the increase in Cu concentration. XPS result confirmed Cu ions are univalent in the films, which induced the room-temperature ferromagnetism.
  S.A. Abdul Azis , J. Kennedy , P.P. Murmu , F. Fang and P. Cao
  Ion Beam Sputtering (IBS) technique has been used to prepare a series of hydroxyapatite (HA) thin films on Ti and Ti alloy substrates for biomedical application. We report the effect of Post Deposition Heat Treatment (PDHT) on the structural, compositional and surface characteristics of HA films deposited on Ti-6Al-4V. The films underwent PDHT for 2 h at 300, 400, 500 and 600°C under air environment. After PDHT, the structure and the chemical composition of the films were characterized using Rutherford Backscattering Spectrometry (RBS), X-ray Diffraction (XRD), Fourier transform infrared absorption spectrometry (FTIR) and Scanning Electron Microscopy (SEM). The results showed that the crystallinity of HA increased with temperature. However, SEM results revealed that some cracks were observed if the temperature of PDHT was higher than 600°C. FTIR measurements showed that the existence of hydroxyl and phosphate bands in all films increased with temperature. RBS analysis indicated that the as-deposited films had a low Ca/P ratio which increased to stoichiometric value with increasing PDHT temperature. From this study we suggest that 600°C is probably the best PDHT temperature to obtain a better characterization and surface properties of HA film produced by IBS. It can also be concluded that IBS can be used as an alternative method for deposit HA film on titanium alloy substrate.
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