分散性
纳米颗粒
聚合物
材料科学
纳米技术
化学工程
高分子化学
复合材料
工程类
作者
Lin Guo,Shihe Yang,Chunlei Yang,Ping Yu,Jiannong Wang,Weikun Ge,George K. Wong
摘要
We report the preparation of highly monodisperse ZnO nanoparticles using poly(vinyl pyrrolidone) (PVP) as the capping molecules. The surface-modified ZnO nanoparticles were found to be remarkably stable. The optical absorption shows distinct excitonic features. Markedly enhanced near-band-edge ultraviolet photoluminescence and significantly reduced defect-related green emission were also observed. We attribute this observation to the nearly perfect surface passivation of the ZnO nanoparticles by the PVP molecules. The third-order nonlinear optical response of these PVP-capped ZnO nanoparticles in a dilute solution was found to be significantly larger (by at least two orders of magnitude) than that of the bulk ZnO.
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