Transformation of silver nanospheres into nanobelts and triangular nanoplates through a thermal process
Transformation of silver nanospheres into nanobelts and triangular nanoplates through a thermal process
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DOI：
10.1021/nl00034140t
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发表时间：
2003-05-01
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：
Sun, YG;Mayers, B;Xia, YN
用平均直径为3.5 nm的球形银胶体水相分散回流制备了具有尖角和薄纳米带的三角形纳米片。在聚乙烯基吡罗烷酮（PVP）和柠檬酸钠的存在下，用硼氢化钠还原硝酸银，生成银的球形胶体。我们的研究表明，在普通的化学实验室中，存在的光足够强，可以将一些球形纳米颗粒转化为小的三角形纳米板。回流为促进奥斯特瓦尔德成熟过程提供了动力——以牺牲球形纳米颗粒为代价，使这些片状种子生长。此外，回流也可能选择性地破坏小三角形纳米板表面的有机层，由于相邻板之间强烈的偶极子-偶极子相互作用，驱动这些板组装成薄纳米带。这些具有独特平面形状的银纳米结构可能会在光子学、光电子学和光学传感等领域得到应用。
Silver has been prepared as triangular nanoplates with sharp corners and thin nanobelts by refluxing an aqueous dispersion of spherical colloids of silver with an average diameter of 3.5 nm. The spherical colloids of silver were, in turn, generated by reducing silver nitrate with sodium borohydride in the presence of poly(vinyl pyrrolidone) (PVP) and sodium citrate. Our studies indicate that the light present in an ordinary chemical laboratory was sufficiently strong to transform some spherical nanoparticles into small triangular nanoplates. Refluxing provided the driving force to facilitate the Ostwald ripening process-growth of these plate-like seeds at the expense of spherical nanoparticles. In addition, refluxing might also selectively disrupt the organic layers on the surfaces of the small triangular nanoplates, driving these plates to assemble into thin nanobelts due to the strong dipole-dipole interaction between adjacent plates. These nanostructures of silver with unique planar shapes might find use in areas that include photonics, optoelectronics, and optical sensing.