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Synthesis and Crystal Structures of Gold Nanowires with Gemini Surfactants as Directing Agents
Author(s) -
Xu Feng,
Hou Hao,
Gao Zhig
Publication year - 2014
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201402438
Subject(s) - nanorod , bromide , transmission electron microscopy , nanowire , nanotechnology , nanostructure , materials science , pulmonary surfactant , chemical engineering , selected area diffraction , electron diffraction , high resolution transmission electron microscopy , chemistry , crystallography , diffraction , organic chemistry , optics , physics , engineering
The preparation of crystalline gold nanowires (NWs) by using gemini surfactants as directing agents through a three‐step seed‐mediated method is reported. Unlike the nanorods with relatively low aspect ratios (typically below 20) obtained by using cetyltrimethylammonium bromide as a directing agent, the NWs obtained in this investigation can reach up to 4.4 μm, and the largest aspect ratio is calculated to be 210. For this, each of seven different gemini surfactants are utilized as directing agents, and the length and/or aspect ratio of the NWs can be tuned by varying the hydrocarbon chain lengths of the gemini surfactants. Both single and twinned crystalline structures are elucidated by selected‐area electron diffraction and high‐resolution transmission electron microscopy studies. The use of gemini surfactants not only advances the synthesis of gold nanostructures, but improves the understanding of the growth mechanism for seed‐mediated growth.