Choo Priscilla, Arenas-Esteban Daniel, Jung Insub, Chang Woo Je, Weiss Emily A, Bals Sara, Odom Teri W
Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States.
EMAT, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium.
ACS Nano. 2022 Mar 22;16(3):4408-4414. doi: 10.1021/acsnano.1c10669. Epub 2022 Mar 3.
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.
古德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。尽管不同的古德缓冲液能够产生具有沿特定晶体学方向取向分支的AuNS形状，但其作用机制尚未完全明确。本文报道了对由HEPES、EPPS和MOPS古德缓冲液合成AuNS过程中的中间结构进行分析，如何能为无籽AuNS的形成提供见解。利用在早期（数分钟）淬灭的AuNS结构的电子断层扫描来表征初始种子的形态，并在后期构建生长图谱。通过这种方法，我们确定了用不同古德缓冲液合成的首个结构的结晶度和形状如何决定最终的AuNS形态。
