INOR 645 |
| A simple and effective aqueous-phase approach was demonstrated for the large-scale synthesis of perfect Ag triangular nanoplates, with average thickness of 15-20 nm and average size tunable from 60 to 480 nm. The synthesis process involved the reduction of silver nitrate with sodium borohydride in the presence of concentrations of sodium citrate and Dioctyl sulfosuccinate sodium salt (AOT) and then a heat-treatment at 60 0C for 40 - 65 h. It is indicated that the Ag triangular nanoframes formed intermediately in the formation process, serving as the templates of triangular nanoplates. The formation process of triangular nanoframes is involved with the nanoparticles assemble due to the interaction with AOT. In addition, the heating provided the driving force to facilitate the Ostwald ripening process-growth of these triangular nanoframes at the expense of some nanoparticles and incorporation of nanoparticles. Studies from different AOT concentrations and the pH and the reaction time demonstrated that triangular nanoframe-mediated growth mechanism was supported only in the proper experimental conditions. |
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Nanoscience: Synthesis and Characterization
7:00 PM-10:00 PM, Tuesday, August 21, 2007 BCEC -- Exhibit Hall - B2, Poster
Division of Inorganic Chemistry |