[14a-D63-1~10] 1.3 Novel technologies and interdisciplinary engineering

△ [14a-D63-3] Analysis of Energy-resolved Distribution of Electron Traps as a Fingerprint of Metal Oxide Powders

〇(D)Akio NITTA¹, Mai TAKASE², Mai TAKASHIMA^1,3, Naoya MURAKAMI⁴, Bunsho OHTANI^1,3 (1.Hokkaido Univ., 2.Muroran Inst. of Tech., 3.Inst. for Catalysis, 4.Kyushu Inst. of Tech)

Keywords:electron trap, metal oxide powder, photoacoustic spectroscopy

In order to elucidate the role of electron traps (ETs) in heterogeneous photocatalysis, energy-resolved distribution of electron traps (ERDT) with conduction-band bottom (CBB) in metal oxide particles as a function of energy from valence-band top (VBT) has been evaluated by reversed double-beam photoacoustic spectroscopy (RDB-PAS), in which photoabsorption of electrons in ETs directly excited from VB to ETs by irradiation of continuous light is measured by PAS using modulated light. In this study, how to employ ERDT/CBB pattern as a fingerprint for identification of metal oxide powders having band gap and ETs by weighted degree of coincidence multiplied by the degree of coincidence for ERDT patterns, total density of ETs, and CBB position, and correlation between degree of coincidences for ERDT/CBB patterns and photocatalytic activities are discussed.