期刊
COLLOID AND POLYMER SCIENCE
卷 288, 期 18, 页码 1705-1711出版社
SPRINGER
DOI: 10.1007/s00396-010-2313-8
关键词
ZnO nanoparticles; PVP; Coupling agent; Photocatalytic activity
The preparation of silica-coated ZnO nanocomposite using polyvinyl pyrrolidone (PVP) as a coupling agent was investigated. Transmission electron microscopy analysis revealed that silica has been deposited on the surface of PVP-capped ZnO nanoparticles as a continuous thin layer. Two-dimensional correlation analysis based on the time-dependent UV-vis spectra was introduced to study the interaction governing the deposition of silica on to PVP-capped ZnO. Strong hydrogen bonds formed between the amphiphilic PVP molecules and silica in the silica-coated PVP-capped ZnO composites. The reduced photocatalytic activity of silica-coated ZnO nanoparticles will enhance their performance as durable, safe, and non-reactive UV blockers in plastics, paints, and coating for outdoor textile and timber products.
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