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Journal of Materials Chemistry C Vol - 2 Issue - 5

Journal of Materials Chemistry C Vol -1

Anisotropic growth of gold nanoparticles using cationic gemini surfactants: effects of structure variations in head and tail groups

Content Provider	Royal Society of Chemistry (RSC)
Author	Erhart, Paul Tehrani-Bagha, Ali R. Nørgaard, Kasper Holmberg, Krister Crawford, Ross Moth-Poulsen, Kasper Johnson, Erik Jain, Titoo Shekhar, Himanshu
Copyright Year	2014
Abstract	A library of gemini surfactants is employed to study surfactant directed anisotropic growth of gold nanoparticles. The surfactants are modified with respect to the length and type of the tails, as well as of the spacer group. By analyzing the structure of the anisotropic nanoparticles, it is possible to extract information on how the structure of the surfactants influences the anisotropic gold nanocrystal growth. We find that the tail length of the surfactants has a greater influence on the resulting nanoparticle aspect ratio compared to the chemical nature of the spacer group. While clear trends between the aspect ratio and the tail as well as spacer length remain elusive, we observe that surfactants with a critical micelle concentration of ∼1 mM produce particles with the highest aspect ratio. A crystallographic analysis of nanorods obtained using gemini surfactants reveals that they grow along 〈100〉 and are bound by {310} facets. This observation, which is specific for gemini surfactants, is explained by taking into account the preferential alignment of gemini surfactants with surface steps as suggested by electronic structure calculations.
Starting Page	994
Ending Page	1003
Page Count	10
File Format	HTM / HTML PDF
ISSN	20507526
Volume Number	2
Issue Number	6
Journal	Journal of Materials Chemistry C
DOI	10.1039/c3tc32057j
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Library Gemini Observatory Surfactant Anisotropy Nanocrystal Nanoparticle Aspect ratio Critical micelle concentration Preferential alignment
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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