Bottom-up and top-down approaches to the synthesis of monodispersed spherical colloids of low melting-point metals
Bottom-up and top-down approaches to the synthesis of monodispersed spherical colloids of low melting-point metals
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DOI：
10.1021/nl048689j
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发表时间：
2004-10-01
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：
Wang, YL;Xia, YN
我们报告了两种不同的基于溶液的方法，这两种方法使我们能够将熔点低于400度的金属加工成单分散的球形胶体，数量丰富，直径在100到600纳米范围内可控。选择铋作为典型的例子来说明这些概念。单分散铋颗粒的生产是通过在沸腾的乙二醇中热分解醋酸铋（自下而上的方法）或在沸腾的乙二醇中乳化熔融铋滴（自上而下的方法），然后用冷乙醇淬火来实现的。根据铋前驱体的浓度和搅拌速率的不同，这些均匀的球形胶体的直径可以很容易地在100到600 nm之间变化。这种合成方法也被扩展到从其他熔点相对较低的金属中制备均匀的球形胶体，典型的例子包括Pb、In、Sn、Cd及其合金。
We report two different, solution-based approaches that have allowed us to process metals with melting points below 400 degreesC as monodispersed spherical colloids, in copious quantities, and with diameters controllable in the range of 100 to 600 nm. Bismuth was selected as a typical example to demonstrate the concepts. The production of monodispersed bismuth particles was realized by either thermally decomposing bismuth acetate in boiling ethylene glycol (the bottom-up approach) or by emulsifying molten drops of bismuth in boiling di(ethylene glycol) (the top-down approach), followed by quenching with cold ethanol. Depending on the concentration of Bi precursor and the stirring rate, the diameters of these uniform spherical colloids could be readily varied from 100 to 600 nm. The synthetic protocols have also been extended to prepare uniform spherical colloids from other metals with relatively low melting points, and typical examples include Pb, In, Sn, Cd, and their alloys.