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Investigating Reaction Intermediates during the Seedless Growth of Gold Nanostars Using Electron Tomography

机译:使用电子断层扫描技术研究金纳米星无籽生长过程中的反应中间体

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摘要

Good's buffers can act both as nucleating and shape-directing agents during the synthesis of anisotropic gold nanostars (AuNS). Although different Good's buffers can produce AuNS shapes with branches that are oriented along specific crystallographic directions, the mechanism is not fully understood. This paper reports how an analysis of the intermediate structures during AuNS synthesis from HEPES, EPPS, and MOPS Good's buffers can provide insight into the formation of seedless AuNS. Electron tomography of AuNS structures quenched at early times (minutes) was used to characterize the morphology of the incipient seeds, and later times were used to construct the growth maps. Through this approach, we identified how the crystallinity and shape of the first structures synthesized with different Good's buffers determine the final AuNS morphologies.
机译:Good的缓冲液在各向异性金纳米星(AuNS)的合成过程中既可以作为成核剂,也可以作为形状导向剂。尽管不同的Good's缓冲液可以产生AuNS形状,其分支沿特定的晶体方向定向,但其机制尚不完全清楚。本文报道了HEPES、EPPS和MOPS Good缓冲液在AuNS合成过程中的中间结构分析如何为无籽AuNS的形成提供见解。使用早期(分钟)淬灭的AuNS结构的电子断层扫描来表征初期种子的形态,并使用后期时间构建生长图。通过这种方法,我们确定了用不同Good's缓冲液合成的第一批结构的结晶度和形状如何决定最终的AuNS形态。

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