Howard Laura M, Ackerson Christopher J
Department of Chemistry, Colorado State University , Fort Collins, Colorado 80523, United States.
J Phys Chem A. 2014 Sep 18;118(37):8124-8. doi: 10.1021/jp5001946. Epub 2014 Mar 27.
Etching or size-focusing methods are now widespread for preparation of atomically monodisperse thiolate-protected gold nanoparticles. Size-focusing methods are not widespread, however, in the production of water-soluble gold nanoparticles. Reported here is a new method for size-focusing of large gold nanoparticles utilizing p-mercaptobenzoic acid. We observe preferential formation of three large gold nanoparticles with approximate masses of 23, 51, and 88 kDa. On the basis of the stability of these masses against further etching or growth, they appear to be especially stable sizes. These sizes are not prominent after etching challenges with organosoluble ligands, and the 51 and 88 kDa sizes appear to be novel stable thiolate-protected gold cluster sizes. The overall trend in particle size distribution over time is also unusual, with larger sizes dominating at longer time points.
蚀刻或尺寸聚焦方法目前在制备原子单分散硫醇盐保护的金纳米颗粒方面应用广泛。然而，尺寸聚焦方法在水溶性金纳米颗粒的生产中并不常见。本文报道了一种利用对巯基苯甲酸对大金纳米颗粒进行尺寸聚焦的新方法。我们观察到优先形成了三种大金纳米颗粒，其近似质量分别为23 kDa、51 kDa和88 kDa。基于这些质量对进一步蚀刻或生长的稳定性，它们似乎是特别稳定的尺寸。在用有机可溶性配体进行蚀刻挑战后，这些尺寸并不突出，并且51 kDa和88 kDa的尺寸似乎是新型稳定的硫醇盐保护的金簇尺寸。随着时间推移，颗粒尺寸分布的总体趋势也不寻常，在较长时间点较大尺寸占主导。
