Photo-oxidation activities on Pd-doped TiO2 nanoparticles: critical PdO formation effect
- Authors
- Lee, Hangil; Shin, Minjeong; Lee, Myungjin; Hwang, Yun Jeong
- Issue Date
- Apr-2015
- Publisher
- ELSEVIER
- Keywords
- PdTiO2 nanoparticles; Photocatalytic oxidation; Raman Spectroscopy; HRPES; PdO
- Citation
- APPLIED CATALYSIS B-ENVIRONMENTAL, v.165, pp 20 - 26
- Pages
- 7
- Journal Title
- APPLIED CATALYSIS B-ENVIRONMENTAL
- Volume
- 165
- Start Page
- 20
- End Page
- 26
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/10594
- DOI
- 10.1016/j.apcatb.2014.09.061
- ISSN
- 0926-3373
1873-3883
- Abstract
- 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.
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