Synthesis and characterization of water-soluble and bifunctional ZnO-Au nanocomposites
Synthesis and characterization of water-soluble and bifunctional ZnO-Au nanocomposites
复制标题
水溶性双功能ZnO-Au纳米复合材料的合成与表征
DOI：
10.1021/jp064118z
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发表时间：
2007-03-15
影响因子：
3.7
通讯作者：
Zhang, Hong
中科院分区：
文献类型：
--
作者：
Wang, Xin;Kong, Xianggui;Zhang, Hong
多组分纳米复合材料(NCS)的合成能力不仅对探索其单个组分的功能特性，而且对于探索其在技术应用中的组合的功能特性都具有重要意义。本文研究了以氧化锌为荧光材料，以金为有机官能团的双功能氧化锌-金纳米管的合成与表征。采用氧化锌纳米晶作为晶种材料，用于柠檬酸还原金的成核和生长，形成了可溶于水的氧化锌-金纳米管。用透射电子显微镜和X射线衍射仪对纳米氧化锌的形貌和组成进行了表征，结果表明纳米氧化锌为哑铃状，晶态为纤锌矿结构，纳米金颗粒为面心立方结构。在水溶液中，氧化锌-金纳米管的表面等离子体吸收带相对于单金属金纳米颗粒有明显的展宽和红移，紫外光发射强度比纯的氧化锌纳米晶高约一个数量级，反映了氧化锌和金之间的强界面相互作用。此外，Au表面等离子体强局域电磁场也大大增强了氧化锌的多声子喇曼散射。
The ability to synthesize multicomponent nanocomposites (NCs) is important for exploring their functional properties of not only individual single components but also their combinations in technological applications. This paper presents an investigation on the synthesis and characterization of water-soluble and bifunctional ZnO-Au NCs, of which ZnO provides fluorescence and Au is used for organic functionality for bioconjugation. ZnO nanocrystals were employed as seeding material for nucleation and growth of reduced gold by citrate to form the water-soluble ZnO-Au NCs. The morphology and components of the ZnO-Au NCs, characterized by the TEM and XRD, respectively, demonstrate a dumbbell-like shape and crystalline wurtzite ZnO together with face-center-cubic Au nanoparticles. The surface plasmon absorption band of ZnO-Au NCs in aqueous solution is distinctly broadened and red-shifted relative to monometallic Au nanoparticles, and the UV emission intensity is higher by about I order of magnitude in ZnO-Au NCs than in pure ZnO nanocrystals; these observations reflect the strong interfacial interaction between ZnO and Au. Moreover, multiphonon Raman scattering of ZnO is also largely enhanced by the strongly localized electromagnetic field of the Au surface plasmon.