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분야
hwp1. Nanorods
2. Platonic nanoparticles
3. Nanoplates
4. Branched nanostructures
of the reported procedures for rod formation, seedmediated growth has been by far the most efficient and popular approach. The role played by the seed particle is also critical. Furthermore, the presence of small amounts or silver nitrate during the synthesis has a dramatic effect on the final shape and crystalline structure if the particles. Citrate-capped gold nanoparticle, prepared through reduction of HAuCl4 with borohydride ions have traditionally been chosen as seeds for gold nanorod growth. Addition of silver nitrate during Au nanorod growth from penta-twinned seeds leads to an increase in the gold nanorod yield and greatly improves control over the aspect ratio. Contrary to the results obtained with citrate-capped Au nanoparticle seeds, when CTAB is used during borohydride reduction of HAuCl4, single crystalline seeds are obtained, which are also smaller in size. One important piece of evidence for the valuable role played by AgNO3 as an additive is that, even when using single crystalline seeds, growth in the absence of silver ions leads to nanoparticles with a wide variety of shapes including spheres, triangles, and rods. Fig. 1f shows a representative TEM image of the obtained nanoparticles. It is evident that there is no control over the particle
-Alternative Methods for the Preparation of Gold Nanoparticles Supported on TiO2
J. Phys. Chem. B 2002, 106, 7634-7642
-Chem Soc Rev, Published on 07 July 2008 on http://pubs.rsc.org | doi:10.1039/B711490G
