Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 358, Issue 1-3, Pages 108-114Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2010.01.029
Keywords
Nanostructure; Crystal morphology; Adsorption; Surfaces; X-ray diffraction; Nanomaterials
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Funding
- National University of Singapore (NUS) [R-263-000-471-112/133]
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High purity Au nanoparticles and nanorods have been synthesized using seed-mediated approach in aqueous solution with the presence of cetyltrimethylammonium bromide (CTAB) surfactant. The control of seed concentration and the addition of silver nitrate yield Au nanostructures of high monodispersivity. After obtaining high concentration dispersion of anisotropic monodispersed colloidal nanocrystals, evaporation induced self-assembly of Au nanostructures was carried out. The Au nanocrystals experience strong capillary forces through the surface of the drying solvent which forces them to self-assemble while CTAB assist in drawing the nanocrystals closer without aggregating them and finally homogeneity in the shapes and sizes of the as-synthesized Au nanocrystals facilitate the self-assembly of Au nanostructures into ordered 3D assemblies. Thus, in the preparation of a large-scale assembly, high concentration, surfactant capping and monodispersivity of the Au nanostructures are essential. (C) 2010 Elsevier B.V. All rights reserved.
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