Investigating Reaction Intermediates during the Seedless Growth of Gold Nanostars Using Electron Tomography
Investigating Reaction Intermediates during the Seedless Growth of Gold Nanostars Using Electron Tomography
复制标题
使用电子断层扫描研究金纳米星无核生长过程中的反应中间体
DOI：
10.1021/acsnano.1c10669
复制
发表时间：
2022
期刊：
影响因子：
17.1
通讯作者：
Odom, Teri W.
中科院分区：
文献类型：
--
作者：
Choo, Priscilla;Arenas-Esteban, Daniel;Jung, Insub;Chang, Woo Je;Weiss, Emily A.;Bals, Sara;Odom, Teri W.
在各向异性金纳米星(AUNS)的合成过程中，Good‘s缓冲液既能起到成核作用，又能起到定形作用。尽管不同的Good‘s缓冲液可以产生具有沿特定晶体方向取向的分支的AUNS形状，但其机制尚不完全清楚。本文报道了如何通过对HEPES、EPPS和MOPS Good的缓冲液合成AUNS过程中的中间结构的分析来深入了解无核AUNS的形成。用早期(分钟)淬火的AUNS结构的电子断层扫描来表征初始种子的形态，并用后来的时间来构建生长图。通过这种方法，我们确定了不同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形貌。
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.