New polymer-inorganic nanocomposites: PEO-ZnO and PEO-ZnO-LiClO4 films

Citation
Hm. Xiong et al., New polymer-inorganic nanocomposites: PEO-ZnO and PEO-ZnO-LiClO4 films, J PHYS CH B, 105(42), 2001, pp. 10169-10174
Citations number
40
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
JOURNAL OF PHYSICAL CHEMISTRY B
ISSN journal
1520-6106 → ACNP
Volume
105
Issue
42
Year of publication
2001
Pages
10169 - 10174
Database
ISI
SICI code
1520-6106(20011025)105:42<10169:NPNPAP>2.0.ZU;2-T
Abstract
Polymer-inorganic nanocomposite films of PEO-ZnO and PEO-ZnO-LiClO4, where PEO stands for poly(ethylene oxide), have been prepared through a film-cast ing method. Interactions between PEO (MW = 600 000) and ZnO nanoparticles ( average size 3.5 nm, with acetate groups on the surface) decrease the photo luminescence intensity of the PEO film to a great extent. These interaction s, which are also manifested by the X-ray diffraction, depend on the concen tration and the aggregation of the ZnO nanoparticles in the PEO-ZnO films. The cooperative effect of PEO and LiClO4 changes the unidentate coordinatio n mode of the acetate groups with zinc into three coexisting modes: unident ate, bidentate, and bridging, suggesting that PEO segments, lithium ions, a nd the acetate groups on ZnO nanoparticle surface form cross-linking struct ures. Such cross-linking structures, on one hand, reduce Li+ClO4- ion pairs to release more free ions as charge carriers in the PEO-ZnO-LiClO4 film an d, on the other, decrease the film crystallinity to produce more amorphous regions for charge carriers to transfer, and finally enhance the conductivi ty of the film.