Abstract
A two-step method has been used to fabricate nano-particles of layer-structured bismuth chalcogenide compounds, including Bi2Te3, Bi2Se3, and Bi2Se0.3Te2.7, through a nano-scaled top-down route. In the first step, lithium (Li) atoms are intercalated between the van der Waals bonded quintuple layers of bismuth chalcogenide compounds by controllable electrochemical process inside self-designed lithium ion batteries. And in the second step, the Li intercalated bismuth chalcogenides are subsequently exposed to ethanol, in which process the intercalated Li atoms would explode like atom-scaled bombs to exfoliate original microscaled powder into nano-scaled particles with size around 10 nm. The influence of lithium intercalation speed and amount to three types of bismuth chalcogenide compounds are compared and the optimized intercalation conditions are explored. As to maintain the phase purity of the final nano-particle product, the intercalation lithium amount should be well controlled in Se contained bismuth chalcogenide compounds. Besides, compared with binary bismuth chalcogenide compound, lower lithium intercalation speed should be applied in ternary bismuth chalcogenide compound.
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Financial supports from Program of Shanghai Subject Chief Scientist (No. 09XD1404400), and National Basic Research Program of China (973 Program) (No.2007CB607500) are gratefully acknowledged.
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Chen, J., Zhu, Y., Chen, N. et al. Nano-scaled top-down of bismuth chalcogenides based on electrochemical lithium intercalation. J Nanopart Res 13, 6569–6578 (2011). https://doi.org/10.1007/s11051-011-0563-0
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DOI: https://doi.org/10.1007/s11051-011-0563-0