The results of a systematic XPS study, under high controlled conditions, of different basic oxides of transition metals, alkali and alkaline-earth metals are presented; the XPS data of some hydroxides and peroxides are also reported. Variations of the O 1s binding energies are analysed and one point of interest is the large
 binding energy scale obtained for O 1s peaks all associated with a ‘‘2−
’’ formal charge. Through extended
 Huckel theory-tight binding (EHT-TB) calculations, attempts are made to rationalize the observed variations.
 The results illustrate
 the significant
 differences
 between real
 charges on oxygen atoms in transition metal and alkaline-earth oxides.

Systematic XPS studies of metal oxides, hydroxides and peroxides

Synchrotron radiation studies of H2O adsorption on TiO2(110)

Nanosized CdS coupled TiO2 nanocrystals were prepared by a microemulsion-mediated solvothermal method at relatively low temperatures The prepared samples were characterized by X-ray photoelectron spectroscopy (XPS), BET surface area analysis, X-ray diffraction (XRD), UV–vis absorption spectroscopy (UV–vis), transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM) It was found that the CdS coupled TiO2 materials consisted of uniform anatase TiO2 of 6–10 nm with highly dispersed cubic phase CdS nanocrystals The prepared samples exhibit strong visible light absorption at about 550 nm Meanwhile, they have high surface area in the range of 156–263 m2 g−1 and mesoporous character with the average pore diameter of ca 50–65 nm The coupling between the (1 0 1) crystal planes of anatase and (1 1 1) crystal planes of CdS was observed in the HRTEM image Ti3+ signal was observed in the electron paramagnetic resonance (EPR) spectrum of CdS coupled TiO2 nanocrystals under visible light irradiation It provided the evidence of an effective transfer of photo-generated electrons from the conduction band of CdS to that of TiO2 As expected, the nanosized CdS sensitized TiO2 nanocrystal materials showed enhanced activity in the oxidation of methylene blue in water or nitric oxide in air under visible light irradiation The mechanism of photocatalysis on CdS coupled TiO2 nanocrystals under visible light is also discussed

Characterization and photocatalytic mechanism of nanosized CdS coupled TiO2 nanocrystals under visible light irradiation

XPS study of thin films of titanium oxysulfides

An X-ray photoelectron spectroscopy sputter profile study of the native air-formed oxide film on titanium

X-ray photoelectron spectroscopy of TiO2 and other titanate electrodes and various standard Titanium oxide materials: Surface compositional changes of the TiO2 electrode during photoelectrolysis

Curt N. Sayers

Papers

X-ray photoelectron spectroscopy of TiO2 and other titanate electrodes and various standard Titanium oxide materials: Surface compositional changes of the TiO2 electrode during photoelectrolysis