title: Enhancement of Photo-Oxidation Activities Depending on Structural Distortion of Fe-Doped TiO2 Nanoparticles.
abstract: To design a high-performance photocatalytic system with TiO2, it is necessary to reduce the bandgap and enhance the absorption efficiency. The reduction of the bandgap to the visible range was investigated with reference to the surface distortion of anatase TiO2 nanoparticles induced by varying Fe doping concentrations. Fe-doped TiO2 nanoparticles (Fe@TiO2) were synthesized by a hydrothermal method and analyzed by various surface analysis techniques such as transmission electron microscopy, Raman spectroscopy, X-ray diffraction, scanning transmission X-ray microscopy, and high-resolution photoemission spectroscopy. We observed that Fe doping over 5 wt.% gave rise to a distorted structure, i.e., Fe2Ti3O9, indicating numerous Ti(3+) and oxygen-vacancy sites. The Ti(3+) sites act as electron trap sites to deliver the electron to O2 as well as introduce the dopant level inside the bandgap, resulting in a significant increase in the photocatalytic oxidation reaction of thiol (-SH) of 2-aminothiophenol to sulfonic acid (-SO3H) under ultraviolet and visible light illumination.
authors.affiliation: Molecular-Level Interfaces Research Center, Department of Chemistry, KAIST, Daejeon, 34141, Republic of Korea. younwooj@kaist.ac.kr.
authors.forename: Yeonwoo
authors.initials: Y
authors.lastname: Kim
authors.affiliation: Molecular-Level Interfaces Research Center, Department of Chemistry, KAIST, Daejeon, 34141, Republic of Korea. senacap@kaist.ac.kr.
authors.forename: Sena
authors.initials: S
authors.lastname: Yang
authors.affiliation: Molecular-Level Interfaces Research Center, Department of Chemistry, KAIST, Daejeon, 34141, Republic of Korea. ehj976@kaist.ac.kr.
authors.forename: Eun Hee
authors.initials: EH
authors.lastname: Jeon
authors.affiliation: Beamline Research Division, Pohang Accelerator Laboratory (PAL), Pohang, 37673, Kyungbuk, Republic of Korea. cla100@postech.ac.kr.
authors.forename: Jaeyoon
authors.initials: J
authors.lastname: Baik
authors.affiliation: Beamline Research Division, Pohang Accelerator Laboratory (PAL), Pohang, 37673, Kyungbuk, Republic of Korea. east@postech.ac.kr.
authors.forename: Namdong
authors.initials: N
authors.lastname: Kim
authors.affiliation: Department of Chemistry, Pukyoung National University, Busan, 48513, Republic of Korea. kimhs75@pknu.ac.kr.
authors.forename: Hyun Sung
authors.initials: HS
authors.lastname: Kim
authors.affiliation: Department of Chemistry, Sookmyung Women's University, Seoul, 04310, Republic of Korea. easyscan@sookmyung.ac.kr.
authors.forename: Hangil
authors.initials: H
authors.lastname: Lee
keywords: 2-Aminothiophenol; Bandgap narrowing; Distorted TiO2; Photo-oxidation
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