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- Title
Influence of Shape-Directing Agents on the Formation of Anisotropic Gold Nanoparticles.
- Authors
Yuan, Huanhuan; Liu, Yunjie; Tong, Ling; Wang, Zhiwei
- Abstract
Understanding the role of shape-directing substances is crucial for the controllable preparation of anisotropic nanostructures through solution growths. Herein, we report a comparative investigation about the morphologies and structures of Au nanoparticles (Au NPs) synthesized using two different capping agents (hexadecyltrimethylammonium chloride (CTAC) and polyvinylpyrrolidone (PVP)) with/without the addition of iodide salts. The study manifests a synergistic effect of shape-directing agents on the growth pathways and shape formation. Depending on the specific use of surfactants/polymers, the iodide additives can promote the growth of prismatic anisotropic nanoparticles or lead to the shape evolution from irregular to quasi-spherical configurations. The effect of iodide additives and organic capping agents (CTAC and PVP) on the formation of shape anisotropy was systematically investigated through UV-vis spectroscopy and transmission electron microscopy characterizations of Au nanoparticles synthesized via a one-pot seedless growth approach. The study revealed a combined role of shape-directing substances (iodide additives and organic capping agents) on the crystallization processes of Au nanoparticles.
- Subjects
GOLD nanoparticles; TRANSMISSION electron microscopy; ELECTRON spectroscopy; ULTRAVIOLET-visible spectroscopy; POLYMERS
- Publication
NANO, 2021, Vol 16, Issue 9, p1
- ISSN
1793-2920
- Publication type
Article
- DOI
10.1142/S1793292021500983