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Effect of PVP molecular weight on the formation of Ag nanoparticles on echinoid-like TiO2

Title
Effect of PVP molecular weight on the formation of Ag nanoparticles on echinoid-like TiO2
Author
오성근
Keywords
Ag nanoparticles; Echinoid-like TiO2; Poly(vinyl pyrrolidone); Alcohol reduction; Photocatalytic activity
Issue Date
2013-04
Publisher
Elsevier Science B.V., Amsterdam.
Citation
Materials letters, April 2013, 96, P.214-217
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. (C) 2013 Elsevier B.V. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S0167577X13000669?via%3Dihubhttp://hdl.handle.net/20.500.11754/44123
ISSN
0167-577X
DOI
10.1016/j.matlet.2013.01.045
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > CHEMICAL ENGINEERING(화학공학과) > Articles
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