Department of Materials, Physics and Energy Engineering, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan.
Nanotechnology. 2011 Nov 11;22(45):455701. doi: 10.1088/0957-4484/22/45/455701. Epub 2011 Oct 13.
Microstructural characteristics of gold nanoparticles (Au NPs) fabricated by solution plasma processing (SPP) in reverse micelle solutions have been studied by high-resolution transmission electron microscopy (HRTEM). The synthesized Au NPs, with an average size of 6.3 ± 1.4 nm, have different crystal characteristics; fcc single-crystalline particles, multiply twinned particles (MTPs), and incomplete MTPs (single-nanotwinned fcc configuration). The crystal structure characteristics of the Au NPs synthesized by the SPP method were analyzed and compared with similar-size Au NPs obtained by the conventional chemical reduction synthesis (CRS) method. The TEM analysis results show that the Au NPs synthesized by the CRS method have shapes and crystal structures similar to those nanoparticles obtained by the SPP method. However, from the detailed HRTEM analysis, the relative number of the Au MTPs and incomplete MTPs to the total number of the Au NPs synthesized by the SPP method was observed to be around 94%, whereas the relative number of these kinds of crystal structures fabricated by the CRS method was about 63%. It is most likely that the enhanced formation of the Au MTPs is due to the fact that the SPP method generates highly reaction-activated species under low environmental temperature conditions.
采用反胶束溶液中的溶液等离子体处理（SPP）方法制备了金纳米颗粒（Au NPs），利用高分辨率透射电子显微镜（HRTEM）对其微观结构特征进行了研究。所合成的 Au NPs 的平均尺寸为 6.3 ± 1.4nm，具有不同的晶体特征；fcc 单晶体颗粒、多孪晶颗粒（MTPs）和不完全 MTPs（单纳米孪晶 fcc 结构）。分析了 SPP 法合成的 Au NPs 的晶体结构特征，并与通过常规化学还原合成（CRS）法获得的相似尺寸的 Au NPs 进行了比较。TEM 分析结果表明，通过 CRS 法合成的 Au NPs 的形状和晶体结构与通过 SPP 法获得的纳米颗粒相似。然而，从详细的 HRTEM 分析可以看出，SPP 法合成的 Au MTPs 和不完全 MTPs 相对于 Au NPs 总数的相对数量约为 94%，而通过 CRS 法制备的这些晶体结构的相对数量约为 63%。很可能是因为 SPP 方法在低温环境条件下生成了高反应活性的物质，从而增强了 Au MTPs 的形成。
