Optical properties of hierarchical-nanostructured TiO{sub 2} and its time-dependent photo-degradation of gaseous acetaldehyde

Journal Article · Mon Dec 23 00:00:00 EST 2013 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4857936· OSTI ID:22217709

Ahn, Kyun; Jeong, Se-Young; Cho, Chae-Ryong ^[1]; Kim, Min-Sun; Kim, Soon-Hyun; Hyun Kim, Jae ^[2]; Kim, Jong-Pil; Sung Jin, Jong ^[3]

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1. College of Nanoscience and Nanotechnology, Pusan National University, Busan 609-735 (Korea, Republic of)
2. Division of Nano and Bio Technology, Daegu Gyeongbuk Institute of Science and Technology, Daegu 711-873 (Korea, Republic of)
3. Division of High Technology Materials Research, Korea Basic Science Institute, Busan 618-230 (Korea, Republic of)

The TiO{sub 2} hierarchical nanostructures (HNs) composed of rutile TiO{sub 2} nanowires on anatase TiO{sub 2} nanofibers had higher photocatalytic activities of 62% and 48% than the commercial TiO{sub 2} nanoparticles (∼21 nm diameter) in the continuous flow mode and closed-circulation mode, respectively, leading to an efficient degradation of gaseous acetaldehyde under UV-light irradiation. This behavior may be attributed to the effective TiO{sub 2} HNs with specific surface area of 85.1 m{sup 2}/g and lower radiative recombination of self-trapped excitons, enabling an effective electron-hole separation.

• OSTI ID: 22217709
• Journal Information: Applied Physics Letters, Vol. 103, Issue 26; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
ACETALDEHYDE
EXCITONS
HOLES
IRRADIATION
OPTICAL PROPERTIES
PHOTOCATALYSIS
QUANTUM WIRES
RUTILE
SEMICONDUCTOR MATERIALS
SPECIFIC SURFACE AREA
TIME DEPENDENCE
TITANIUM OXIDES
ULTRAVIOLET SPECTRA