期刊
ACS NANO
卷 16, 期 3, 页码 4408-4414出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.1c10669
关键词
gold nanostars; nanoparticle growth; multimode electron tomography; structural defects; seedless synthesis; nucleation; twinning
类别
资金
- National Science Foundation (NSF) [NSF CHE-1808502]
- SHyNE Resource [NSF ECCS-2025633]
- IIN
- Northwestern's MRSEC program [NSF DMR-1720139]
- European Research Council under the European Union [815128, 731019]
This paper reports the mechanism of seedless AuNS formation by analyzing the intermediate structures during the synthesis process with Good's buffers.
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.
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