Right bipyramids of silver: A new shape derived from single twinned seeds
Right bipyramids of silver: A new shape derived from single twinned seeds
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DOI：
10.1021/nl060069q
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发表时间：
2006-04-01
期刊：
影响因子：
10.8
通讯作者：
Xia, YN
中科院分区：
文献类型：
--
作者：
Wiley, BJ;Xiong, YJ;Xia, YN
具有单一（1111）孪晶的银纳米颗粒首次被选择性地成核和生长，以产生边长为75-150 nm的正双锥。生产单孪晶种子的关键是在多元醇合成中加入NaBr，其中阿尼奥（3）在聚乙烯吡咯烷酮存在下被乙二醇还原。纳米粒子的检验;在反应的不同阶段，电子显微镜显示球形的单个孪生种子通过它们的（100）面的扩大而生长成正双棱锥。右双锥所表现出的UV-vis-NIR光谱不同于任何其他银纳米结构，并且它们的尖角使得这些新的纳米颗粒特别有希望用于增强拉曼散射。
Silver nanoparticles with a single (1111) twin were selectively nucleated and grown for the first time to produce right bipyramids 75-150 nm in edge length. Key to the production of single twinned seeds was the addition of NaBr to a polyol synthesis in which AgNO(3) is reduced by ethylene glycol in the presence of poly(vinyl pyrrolidone). Examination of nanoparticles; at different stages of the reaction with electron microscopy revealed that the spherical, single twinned seeds grew to become right bipyramids through enlargement of their (100) facets. The UV-vis-NIR spectrum exhibited by right bipyramids is distinct from that of any other silver nanostructure, and their sharp corners make these new nanoparticles especially promising for enhancement of Raman scattering.