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Seeded growth and catalyst-assisted growth are widely used for creating nano-objects with heterostructures. With respect to seeded growth mechanism, a proper lattice mismatch between the growing crystallographic facets from the two different types of nanomaterials is essentially required. Regarding the catalyst-assisted growth process, 1) the initial catalyst particle has to have a melting point below the reaction temperature; 2) the growing material should have a limited solubility in the catalyst particle; 3) the catalyst particle should not form solid solution with the growing material. So far, the catalyst particle is exclusively chosen from the metals, such as Au, Bi, Ga, In, Sn and alloy AlxGa1-x or Au@Bi core/shell-type nanoparticles. In comparison with the seeded growth route, the catalyst-assisted growth method is more suitable for preparing heterostructure nano-objects with large aspect ratio.
Due to the potential applications in solar energy harvesting, heterostructured semiconductor-semiconductor nanocrystals have received increasing interests. Herein we will report our recent investigations on the preparation of several heterostructured nanocrystals such as Cu2S-In2S3,1 Cu1.94S-ZnS,2 etc.
References: 1. Synthesis and Shape-tailoring of the Copper Sulfide/Indium Sulfide-Based Nanocrystals Wei Han, Luoxin Yi, Nan Zhao, Aiwei Tang, Mingyuan Gao*, Zhiyong Tang* J. Am. Chem. Soc., 2008, 130, 13152-13161. 2. Synthesis and Self-assembly of Cu1.94S-ZnS Heterostructured Nanorods Luoxin Yi, Aiwei Tang, Mu Niu, Wei Han, Yanbing Hou, and Mingyuan Gao* CrystEngComm., 2010, 12, 4124 - 4130. |
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