Aqueous solution synthesis of (Sb, Bi)2(Te, Se)3 nanocrystals with controllable composition and morphology

Ziyang Lu, Li Ping Tan, Xiaoxu Zhao, Michael Layani, Ting Sun, Shufen Fan, Qingyu Yan, Shlomo Magdassi*, Huey Hoon Hng

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

The introduction of nanostructures has been considered as one of the promising strategies to enhance the thermoelectric performance of bulk materials. In this work, we report a low-cost and facile aqueous solution method to prepare (Sb, Bi)2(Te, Se)3 nanocrystals with controllable composition and morphology by using short ligands containing thiol, acid and amine groups. The control of the morphology of the nanostructures such as nanowires and nanosheets is studied, and both n-type and p-type nanoparticles have been prepared successfully. The results show that the thermal conductivities of these nanocrystals are effectively reduced due to phonon scattering and the thermoelectric performance is affected greatly by the morphology. TE measurements show that the electrical conductivity can be enhanced significantly by using Bi2Te3 nanosheets, and as a result, a maximum thermoelectric figure-of-merit (ZT) of 0.86 is obtained for Bi2Te3 nanosheets at 225 °C.

Original languageAmerican English
Pages (from-to)6271-6277
Number of pages7
JournalJournal of Materials Chemistry C
Volume1
Issue number39
DOIs
StatePublished - 21 Oct 2013

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