Wang, Y. Q. and Liang, W. S. and Geng, C. Y. (2010) Shape evolution of gold nanoparticles. Journal of Nanoparticle Research, 12 (2). pp. 655-661.
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The tetraoctylammonium bromide-stabilized gold nanoparticles have been successfully fabricated. The shape evolution of these nanoparticles under different annealing temperatures has been investigated using high-resolution transmission electron microscopy. After an annealing at 100Â Â°C for 30Â min, the average diameters of the gold nanoparticles change a little. However, the shapes of gold nanoparticles change drastically, and facets appear in most nanoparticles. After an annealing at 200Â Â°C for 30Â min, not only the size but also the shape changes a lot. After an annealing at 300Â Â°C for 30Â min, two or more gold nanoparticles coalesce into bigger ones. In addition, because of the presence of Cu grid during the annealing, some gold particles become the nucleation sites of Cu2O nanocubes, which possess a microstructure of gold-particle core/Cu2O shell. These Au/Cu2O heterostructure nanocubes can only be formed at a relatively high temperature (â¥300Â Â°C). The results can provide some insights on controlling the shapes of gold nanoparticles.
|Subjects:||Physical Science > Nanophysics|
Physical Science > Nano objects
Material Science > Nanochemistry
Material Science > Nanostructured materials
|Divisions:||Faculty of Engineering, Science and Mathematics > School of Physics|
Faculty of Engineering, Science and Mathematics > School of Chemistry
|Deposited On:||10 Feb 2010 09:10|
|Last Modified:||10 Feb 2010 09:10|
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