Presentation Information
[10p-N206-8]Effect of solute adsorption on surface energy level of valence band maximum of α-Fe2O3 particles dispersed in aqueous solution
:an approach using photoemission yield spectroscopy in air.
〇Mariko Kinoshita1, Sayaka Yanagida1, Shoichi Somekawa1 (1.TIRI)
Keywords:
Photoemission Yield Spectroscopy in Air,photocatalyst,hematite
Surface electronic states in aqueous solution affect many properties of materials in them, for example, the reactivity of a photocatalyst. Therefore, surface electronic state evaluation is a coveted objective for developing such materials. Herein, a newly developed and simple method is proposed to evaluate surface electronic states in aqueous solution. Photoemission yield spectroscopy in air (PYSA), applied for this method, can measure the valence maximum (Ev) of materials at ambient pressure. Specifically with PYSA, the surface Ev of hematite particles dispersed in aqueous solution can be evaluated. This study assessed effects of solutes in aqueous solution on surface Ev. As a solute, p-methoxyphenol and p-nitrophenol was used. The surface Ev shifted when the solutes adsorbed. Moreover, the shift direction was related to the electron donating and accepting properties of solutes, and the shift amount was related to the adsorption amount.