Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 53, Issue 25, Pages 6425-6429Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201403530
Keywords
bismuth selenide; layered compounds; nanoplates; screw dislocation; supersaturation
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Funding
- MOST of China [2014CB932700, 2011CB921403]
- NSFC [21203173, 51371164, J1030412]
- Strategic Priority Research Program B of the CAS [XDB01020000]
- Fundamental Research Funds for the Central Universities [WK2340000050, WK2060190025]
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Bi2Se3 attracts intensive attention as a typical thermoelectric material and a promising topological insulator material. However, previously reported v nanostructures are limited to nanoribbons and smooth nanoplates. Herein, we report the synthesis of spiral Bi2Se3 nanoplates and their screw-dislocation- driven (SDD) bidirectional growth process. Typical products showed a bipyramid-like shape with two sets of centrosymmetric helical fringes on the top and bottom faces. Other evidence for the unique structure and growth mode include herringbone contours, spiral arms, and hollow cores. Through the manipulation of kinetic factors, including the precursor concentration, the pH value, and the amount of reductant, we were able to tune the supersaturation in the regime of SDD to layer-by-layer growth. Nanoplates with preliminary dislocations were discovered in samples with an appropriate supersaturation value and employed for investigation of the SDD growth process.
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