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Densely packed and ordered "suprastructures" are new types of nanomaterials exhibiting broad applications. The direct self-assembly of cetyltrimethylammonium bromide (CTAB)-capped gold nanotriangles to form "suprastructures" was systematically investigated by varying the temperature and tilt angle of the silicon wafer used in the assembly process. Under optimal conditions, nanotriangles form into regular patterns, maintain their integrity, and form edge-to-edge, point-to-point, and face-to-face connections to form ordered "suprastructures" within an area of hundreds of square microns, achieving a high level of regularity. The formation of the "suprastructures" under optimal conditions could be mainly attributed to the complex balance between multiple temperature-dependent factors, including the atom diffusion rate, solvent evaporation rate, self-assembly rate, and the time for which the nanoparticle stays in the wet medium.


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Direct self-assembly of CTAB-capped Au nanotriangles

Show Author's information Qiang Fu1,2,3Guangjun Ran1Weilin Xu1( )
State Key Laboratory of Electroanalytical Chemistryand Jilin Province Key Laboratory of Low Carbon Chemical PowerChangchun Institute of Applied ChemistryChinese Academy of ScienceChangchun130022China
College of Chemistry and Environmental EngineeringShenzhen UniversityShenzhen518060China
Graduate University of Chinese Academy of ScienceBeijing100049China

Abstract

Densely packed and ordered "suprastructures" are new types of nanomaterials exhibiting broad applications. The direct self-assembly of cetyltrimethylammonium bromide (CTAB)-capped gold nanotriangles to form "suprastructures" was systematically investigated by varying the temperature and tilt angle of the silicon wafer used in the assembly process. Under optimal conditions, nanotriangles form into regular patterns, maintain their integrity, and form edge-to-edge, point-to-point, and face-to-face connections to form ordered "suprastructures" within an area of hundreds of square microns, achieving a high level of regularity. The formation of the "suprastructures" under optimal conditions could be mainly attributed to the complex balance between multiple temperature-dependent factors, including the atom diffusion rate, solvent evaporation rate, self-assembly rate, and the time for which the nanoparticle stays in the wet medium.

Keywords: self-assembly, suprastructure, Au, nanotriangles, cetyltrimethylammonium bromide (CTAB)

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Publication history
Copyright
Acknowledgements

Publication history

Received: 22 February 2016
Revised: 05 July 2016
Accepted: 06 July 2016
Published: 01 August 2016
Issue date: November 2016

Copyright

© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2016

Acknowledgements

Acknowledgements

Dr. Mattew R. Jones and Prof. Paul Alivisatos from UC Berkeley are appreciated for the valuable discussion about the self-assembly mechanism. This work was supported by the National Basic Research Program of China (973 Program, Nos. 2012CB932800 and 2014CB932700), National Natural Science Foundation of China (Nos. 21422307, 21303180, 21433003, 21503212, and 21503211), the "Recruitment Program of Global youth Experts" of China, Shenzhen Science and Technology Foundation (No. JCYJ20140418182819116), and the Natural Science Foundation of SZU (No. 201447).

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