Lee, Hangil Shin, Minjeong Lee, Myungjin Hwang, Yun Jeong 2024-01-20T07:30:53Z 2024-01-20T07:30:53Z 2021-09-05 2015-04 0926-3373 https://pubs.kist.re.kr/handle/201004/125590 The catalytic activities of three distinct Pd-doped TiO2 (PdTiO2) nanoparticle samples, post-annealed (at 700, 800, and 900 degrees C) after fabrication on silicon substrates, were analyzed with respect to the photo-oxidation of aniline and 2-thiophenecarboxaldehyde. Through a combination of Raman spectroscopy and high-resolution photoemission spectroscopy (HRPES), we demonstrated that the photocatalytic oxidation occurred only when the PdTiO2 nanoparticles were annealed at temperatures above 800 degrees C, that is, when PdO and Ti3+ had partially formed on the PdTiO2 nanoparticles, which indicates that the presence of PdO and Ti3+ is critical for the photocatalytic oxidation. Additionally, we determined the decrease in the band gaps to visible region with PdTiO2 nanoparticles annealed above 800 degrees C from their valence-band spectra, which resulted in photocatalytic activities even under visible light, lambda = 540 nm. (C) 2014 Elsevier B.V. All rights reserved. English ELSEVIER TITANIUM-DIOXIDE SURFACE PHOTOCATALYSIS PHOTOACTIVITY DIFFUSION METHANE RUTILE GOLD TI3+ Photo-oxidation activities on Pd-doped TiO2 nanoparticles: critical PdO formation effect Article 10.1016/j.apcatb.2014.09.061 1 APPLIED CATALYSIS B-ENVIRONMENTAL, v.165, pp.20 - 26 APPLIED CATALYSIS B-ENVIRONMENTAL 165 20 26 scie scopus 000347584200003 2-s2.0-84908350838 Chemistry, Physical Engineering, Environmental Engineering, Chemical Chemistry Engineering Article TITANIUM-DIOXIDE SURFACE PHOTOCATALYSIS PHOTOACTIVITY DIFFUSION METHANE RUTILE GOLD TI3+ PdTiO2 nanoparticles Photocatalytic oxidation Raman Spectroscopy HRPES PdO