title: Comparative study of photocatalytic activities of hydrothermally grown ZnO nanorod on Si(001) wafer and FTO glass substrates.
abstract: ZnO nanorods have been grown on Si(001) wafer and fluorine-doped tin oxide (FTO) glass substrates for 1 and 4 h with the hydrothermal methods. The morphologies and photocatalytic activities of the ZnO nanorods were found to depend on the substrates. We investigated their properties by using spectroscopic analysis and demonstrated that the shape of nanorod and the ratios of external defects can be controlled by varying the substrates. Our experiments revealed that the nanorods grown on Si(001) have a single-crystalline wurtzite structure with (002) facets and that the number of surface oxygen defects increases with their length as the growth time increases. The nanorods grown on Si(001) have different facets, in particular wider (002) facets, and a higher ratio of the oxygen defect than the nanorods on FTO glass substrate. Moreover, the photocatalytic activities with respect to 2-aminothiophenol (2-ATP) of these nanorods were investigated with high-resolution photoemission spectroscopy (HRPES). We demonstrated that their photocatalytic activity is influenced by the ratios of surface oxygen defects, which varies with the substrate surface.
authors.affiliation: Department of Chemistry, Molecular-Level Interface Research Center, KAIST, Daejeon, 34141, Republic of Korea. ehj976@kaist.ac.kr.
authors.forename: Eun Hee
authors.initials: EH
authors.lastname: Jeon
authors.affiliation: Department of Chemistry, Molecular-Level Interface Research Center, KAIST, Daejeon, 34141, Republic of Korea. senacap@kaist.ac.kr.
authors.forename: Sena
authors.initials: S
authors.lastname: Yang
authors.affiliation: Department of Chemistry, Molecular-Level Interface Research Center, KAIST, Daejeon, 34141, Republic of Korea. younwooj@kaist.ac.kr.
authors.forename: Yeonwoo
authors.initials: Y
authors.lastname: Kim
authors.affiliation: Beamline Research Division, Pohang Accelerator Laboratory (PAL), Pohang, 37673, Republic of Korea. east@postech.ac.kr.
authors.forename: Namdong
authors.initials: N
authors.lastname: Kim
authors.affiliation: Beamline Research Division, Pohang Accelerator Laboratory (PAL), Pohang, 37673, Republic of Korea. shj001@postech.ac.kr.
authors.forename: Hyun-Joon
authors.initials: HJ
authors.lastname: Shin
authors.affiliation: Beamline Research Division, Pohang Accelerator Laboratory (PAL), Pohang, 37673, Republic of Korea. cla100@postech.ac.kr.
authors.forename: Jaeyoon
authors.initials: J
authors.lastname: Baik
authors.affiliation: Center for Nanomaterials, Sogang University, Seoul, 04107, Republic of Korea. kimhs@sogang.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: HRPES; Photocatalytic oxidation; STXM; TEM; ZnO nanorods