Papers by Author: Yan Yan Liu

Abstract: Cerium (Ce) and antimony (Sb) codoped tin dioxide (SnO₂) films (Ce:Sb:Sn=2:3:95 molar ratio) have been prepared on the surface of titanium (Ti) substrate by sol-gel method. A self-assembled layer (SAL) of dodecyl thiol with cholesterol was formed on the surface of Ce-Sb codoped SnO₂ films/Ti electrode. The SAL was then used with the cholesterol as the template forming the molecular imprinting layer. The extraction of cholesterol has resulted in formation of sites in the layer of dodecyl thiol which could have been used as channels for the ferro-ferric cyanide coupled redox reaction to quantify recombining cholesterol on the sites. This sensor prototype could detect cholesterol concentrations between 40 and 60 μM. X-ray diffraction (XRD) and scanning electron microscopy (SEM) have been used to analyze the structure and morphology of the samples.

Abstract: In this work, F-Sb codoped SnO₂ film electrode material has been prepared and used as an anode on titanium (Ti) substrate for degradation of methyl orange. The emphasis is laid on the effect of univalent cations fluoride doped during preparation of F-Sn codoped SnO₂ composites by sol gel method. The facts show that univalent cations fluoride could affects the electro-catalytic degradation rate of methyl orange by F-Sb codoped composite film on the Ti electrode. A promotion to the degradation rates of methyl orange could be observed when KF or NH₄F was used as codopant but other fluoride codopant such as LiF, NaF or HF could slow the methyl orange degradation. X-ray diffraction (XRD) and x-ray photo-electron spectroscopy (XPS) were used to study structures and composition of the anode surface.