Effect of PVP molecular weight on the formation of Ag nanoparticles on echinoid-like TiO2
- Authors
- Jang, Inseok; Song, Kyungho; Park, Jun-Hwan; Kim, Minkyung; Kim, Dae-Wook; Oh, Seong-Geun
- Issue Date
- Apr-2013
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Ag nanoparticles; Echinoid-like TiO2; Poly(vinyl pyrrolidone); Alcohol reduction; Photocatalytic activity
- Citation
- MATERIALS LETTERS, v.96, pp.214 - 217
- Indexed
- SCIE
SCOPUS
- Journal Title
- MATERIALS LETTERS
- Volume
- 96
- Start Page
- 214
- End Page
- 217
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/163096
- DOI
- 10.1016/j.matlet.2013.01.045
- ISSN
- 0167-577X
- Abstract
- Ag nanoparticles were immobilized on echinoid-like TiO2 particles via an alcohol reduction process with poly(vinyl pyrrolidone) (PVP) of different molecular weights (Mw.). The sizes of Ag nanoparticles prepared by using PVP K15 (Mw.: 10,000) and 1(30 (Mw.: 40,000) were 12-15 nm and 19-31 nm, respectively. On the other hand, Ag nanoparticles were not observed when PVP K12 (Mw.: 3500) was used. The crystal structure of Ag nanoparticles formed on TiO2 was face-centered cubic silver phase and the chemical states of Ag nanoparticles were Ag+ and Ag-0. The photocatalytic performance was enhanced by Ag deposition. Among the samples, the prepared Ag/TiO2 composite by using PVP K15 exhibited better photocatalytic activity than other composites due to its higher Ag coverage on the TiO2 surface.
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