Showing papers by "Feng Zhang published in 2000"
TL;DR: Titanium oxide film was coated on the surface of low temperature isotropic carbon by ion beam enhanced deposition (IBED) to improve the blood compatibility of the LTI-carbon mechanical heart valve as mentioned in this paper.
Abstract: Titanium oxide film was coated on the surface of low temperature isotropic carbon (LTI-carbon) by ion beam enhanced deposition (IBED) to improve the blood compatibility of the LTI-carbon mechanical heart valve. The prepared film was found to be polycrystalline with Ti 2+ , Ti 3+ and Ti 4+ coexisting. This oxygen-lack n-type semiconductor film exhibits a better hemocompatibility than that of LTI-carbon in both in vitro and in vivo investigations. The reason is attributed to the surface energy and work function, which are two influencing factors on blood compatibility.
45 citations
02 Jun 2000-Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms
TL;DR: In this paper, an ion beam assisted deposition on an EATON Z-200 system, during which concurrent electron beam evaporation of titanium and bombardment with an inert gas ion beam were carried out in an O2 atmosphere.
Abstract: TiO2−x films were prepared by ion beam assisted deposition on an EATON Z-200 system, during which concurrent electron beam evaporation of titanium and bombardment with an inert gas ion beam were carried out in an O2 atmosphere. Xe+ and Ne+ ions with different current density and incident angles were used. The films were investigated using X-ray diffraction (XRD), glancing incident X-ray diffraction (GIXRD), X-ray photoelectron spectroscopy (XPS) and Rutherford backscattering spectroscopy (RBS). RBS analysis shows that the films are nearly stoichiometric. XPS measurements reveal that the surface was fully oxidized, but Ti2+, Ti3+ and Ti4+ coexist on the Ar+-sputtered surface. XRD and GIXRD analyses show that almost all the films have rutile-type structure and (2 0 0) preferred orientation. After annealing the 2θ angle shift to higher degrees and the (2 0 0) peak intensity increases, which means better crystallization and orientation.
27 citations
TL;DR: In this paper, a series of titanium oxide films have been synthesized on silicon wafers by ion beam enhanced deposition at different O 2 pressures, and the experimental results showed that the films exhibit a polycrystal structure with preferred orientation.
15 citations
TL;DR: In this paper, the influence of O 2 pressure, substrate temperature and ion beam energy on the composition and structure of the prepared titanium oxide films was studied by means of X-ray Photo-Electron Spectroscopy (XPS), RBS, X-Ray Diffraction (XRD), and Glancing Angle Xray Diffraction(GAXRD).
7 citations