Web Release Date: February 1,
L-Cysteine-Assisted Synthesis of PbS Nanocube-Based Pagoda-like Hierarchical Architectures
Department of Nanomaterials and Nanochemistry, Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
Received: August 17, 2007
In Final Form: December 11, 2007
Abstract:
Nanocube-based pagoda-like PbS hierarchical architectures have been fabricated by hydrothermal treatment of Pb(Ac)2 and L-cysteine solution. It was suggested that a biomimetic mineralization process happened during the growth of the hierarchical architectures. The biomolecule, L-cysteine, exerts coordination, oriented nucleation of crystals, and the morphology modulating effect. By studying the intermediates of the reaction, we observed that 4-fold symmetric star-shaped microcrystals were formed at first, and a second nucleation process resulted in the generation of nanocube-based pagoda-like hierarchical architectures. By varying the concentration of the reaction system, we got PbS nanocubes and octahedron microcystals. The morphology evolutions of PbS materials are explained by the growth rule of fcc nanocrystals. This facile L-cysteine-assisted technique is expected to be employed for the shape-controlled synthesis of other fcc structural nanomaterials.
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