In situ Measurements of the Desorption of Water from a TiO2 Surface under Dry Air by Collecting the Photoemission Yield with an Open Counter

Abstract

We investigated the desorption of water from a TiO2 surface under a dry atmosphere by collecting the photoemission yield spectra with an open counter. For this purpose, a new attachment for the photoemission yield measurement was prepared. This apparatus is capable of detecting, in the open air, low-energy electrons excited by photons under dried atmospheres; the dew point is below -35 C. A significant change in the photoemission yield spectra due to exposure to a dry atmosphere was observed. To gain a better understanding of these results, observations of the change in the photoemission yield spectra caused by the thermal desorption of adsorbed water were also carried out. The results are consistent with those obtained by exposure to a dry atmosphere. Based on the relationship between the photoemission yield and the thickness of the water layer, the time dependence of the change in the thickness was explained by the second-order reaction rate equation.

Synthesis and Photocatalytic Activity of La5Ti2Cu(S1−xSex)5O7 Solid Solutions for H2 Production under Visible Light Irradiation

“…Binding energies were corrected using, as a reference, the C 1s peak (284.8 eV). The VBM potentials of the LTCS 1− x Se x O solid solutions were determined by photoelectron spectroscopy in air (PESA) using an open counter as an electron detector (Riken Keiki, AC‐3) . Morphologies were observed via field‐emission scanning electron microscopy (FE‐SEM, Hitachi, S‐4700) and elemental ratios were determined by energy‐dispersive X‐ray spectroscopy (EDX, Horiba, EMAX7000) integrated with SEM.…”

<i>In Situ</i> Measurements of Work Function of Indium Tin Oxide after UV/Ozone Treatment

“…Details of this apparatus were reported in a previous paper. 22) For the measurement at various temperatures, the sample was heated by a small rubber heater connected to temperature controller. In this study, ITO-coated glass (Furuuchi chemical, IN-100) was measured.…”

Characterization of Catechins in Water by Photoemission Yield Spectroscopy in Air

“…The observation of successive changes in a solid surface has been successfully performed. [5][6][7] Note that, in principle, there is no limitation to applying PYSA to any other type of material. PYSA can easily detect photoelectrons from liquids or liquid surfaces.…”