Colloidal Synthesis of Te-Doped Bi Nanoparticles: Low-Temperature Charge Transport and Thermoelectric Properties

ACS Applied Materials & Interfaces
Da Hwi GuJae Sung Son

Abstract

Electronically doped nanoparticles formed by incorporation of impurities have been of great interest because of their controllable electrical properties. However, the development of a strategy for n-type or p-type doping on sub-10 nm-sized nanoparticles under the quantum confinement regime is very challenging using conventional processes, owing to the difficulty in synthesis. Herein, we report the colloidal chemical synthesis of sub-10 nm-sized tellurium (Te)-doped Bismuth (Bi) nanoparticles with precisely controlled Te content from 0 to 5% and systematically investigate their low-temperature charge transport and thermoelectric properties. Microstructural characterization of nanoparticles demonstrates that Te ions are successfully incorporated into Bi nanoparticles rather than remaining on the nanoparticle surfaces. Low-temperature Hall measurement results of the hot-pressed Te-doped Bi-nanostructured materials, with grain sizes ranging from 30 to 60 nm, show that the charge transport properties are governed by the doping content and the related impurity and nanoscale grain boundary scatterings. Furthermore, the low-temperature thermoelectric properties reveal that the electrical conductivity and Seebeck coefficient expectedly ...Continue Reading

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Citations

Dec 29, 2018·Advanced Materials·Seungki JoJae Sung Son
Jun 12, 2021·Nature Communications·Seungjun ChooJae Sung Son
Mar 8, 2019·ACS Applied Materials & Interfaces·Seongheon BaekJae Sung Son
Jul 28, 2020·ACS Applied Materials & Interfaces·Tara ChandYung-Kang Kuo

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