Synthesis and Characterization of Poly(vinylpyrrolidone)-Modified Zinc Oxide Nanoparticles

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• 作者：Lin Guo ; Shihe Yang ; Chunlei Yang ; Ping Yu ; Jiannong Wang ; Weikun Ge ; and George K. L. Wong
• 刊名：Chemistry of Materials
• 出版年：2000
• 出版时间：August 2000
• 年：2000
• 卷：12
• 期：8
• 页码：2268 - 2274
• 全文大小：206K
• 年卷期：v.12,no.8(August 2000)
• ISSN：1520-5002

文摘

We have synthesized highly monodisperse wurtzite ZnO nanoparticles using poly(vinylpyrrolidone) (PVP) as the capping molecules. The effect of surface modification on thesize, structure, morphology, and optical properties of ZnO nanoparticles was investigated.It was found that many properties of the ZnO nanoparticles could be optimized by simplyvarying the molar ratio Zn(II)/PVP. The ZnO nanoparticles prepared under the optimumconditions are particularly stable, monodisperse, as well as small in size. The EXAFS resultshowed a structural contraction in the ZnO nanoparticles relative to the bulk. Thesenanoparticles exhibit distinct excitonic absorption features, markedly enhanced near-band-edge UV photoluminescence, and significantly reduced defect-induced green emission. Thethird-order nonlinear optical response of these PVP-capped ZnO nanoparticles in a dilutesolution was found to be larger than that of the bulk ZnO by at least 2 orders of magnitude.