2011, “ Synthesis and Evaluation of Lead Telluride/Bismuth ..
Bismuth telluride nanoparticles (NPs) have been synthesized using a low-temperature wet-chemical approach from bismuth(III) oleate and tri--octylphosphine telluride. The size and shape of the NPs can be controlled by adjusting the temperature, reaction time, and nature of the surfactants and solvents. Aromatic hydrocarbons (toluene, xylenes) and ethers (phenyl- and benzyl-ether) favor the formation of stoichiometric Bi2Te3 NPs of platelike morphology, whereas the presence of oleylamine and 1-dodecanethiol yields Bi-rich Bi2Te3 spherical NPs. XRD, IR, SEM, TEM, and SAED techniques have been used to characterize the obtained products. We show that the surfactants can be efficiently removed from the surface of the NPs using a two-step process employing nitrosonium tetrafluoroborate and hydrazine hydrate. The surfactant-free NPs were further consolidated into high density pellets using cold-pressing and field-assisted sintering techniques. The sintered surfactant-free Bi2Te3 showed electrical and thermal properties comparable to Bi2Te3 materials processed through conventional solid state techniques, and greatly improved over other nanostructured Bi2Te3 materials synthesized by wet-chemical approaches.
Synthesis and Thermoelectric Characterization of …
Chemical synthesis of bismuth telluride Bi2Te3 andother chalcogenide thermoelectric materials is possible by manydifferent routes.
Stavila, V.; Robinson, D. B.; Hekmaty, M. A.; Nishimoto, R.; Medlin, D. L.; Zhu, S.; Tritt, T. M.; Sharma, P. A. Wet-Chemical Synthesis and Consolidation of Stoichiometric Bismuth Telluride Nanoparticles for Improving the Thermoelectric Figure-of-Merit. ACS Appl. Mater. Interfaces. 2013, 5 (14), 6678-6686.
A new reduction route to bismuth nanoparticles is ..
An investigation into the thermoelectricproperties of the nanostructures shows promising electricalconductivity, thermopower, and thermal conductivity for undoped bismuthtelluride.
Sudarsan Tamang, Synthesis of Semiconductor ..
Fang, H.; Feng, T.; Yang, H.; Ruan, X.; Wu, Y. Synthesis and Thermoelectric Properties of Compositional-Modulated Lead Telluride-Bismuth Telluride Nanowire Heterostructures. 2013, 13 (5), 2058-2063.