Synthesis, Fabrication, and Characterization of Multidimensional Nanoparticle Based Thermoelectric Materials Composed of
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Synthesis, Fabrication, and Characterization of Multidimensional Nanoparticle Based Thermoelectric Materials Composed of Bismuth, Antimony, and Tellurium. Derrick Mott, Nguyen T. Mai, Nguyen T. B. Thuy, Teruyoshi Sakata, Mikio Koyano, and Shinya Maenosono School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan ABSTRACT With the event of nanotechnology, the field of thermoelectric (TE) materials has been reinvigorated with many recent advances towards materials with high thermoelectric efficiency (dimensionless figure of merit, ZT). The realization of such materials opens up new avenues to the creation of devices that can be used in freon-less refrigeration, micro-electronic cooling, or for harnessing lost heat energy from sources such as car engines. In our own research work, we have successfully devised a synthetic technique towards nanoparticles composed of bismuth, antimony, and tellurium that has proven highly versatile in tuning both the composition and shape/structure of the resulting nanoparticles. The ability to control the nanoparticle composition and shape/structure are highly important as these are critical parameters that dictate the resulting devices TE activity. In a modified polyol synthetic technique, it was found that many complex composition, shape, and structure combinations could be obtained for the nanoparticles including Bi-Sb nanodiscs with controllable size, a heterostructure composed of Sb2Te3 nanodiscs deposited on Te nanowires, or small particles deposited on a (Bi0.5Sb0.5)2Te3 wire, just to name a few. By simply changing the capping ligands used in the synthesis, the nanoparticles resulting composition, morphology and structure could be changed, leading to a straightforward route towards TE nanoparticles with interesting properties. This presentation focuses on our recent study of the synthesis of bismuth, antimony, and tellurium composite nanoparticles with applications in thermoelectric materials in terms of understanding the underlying mechanisms of the synthetic technique, and characterization of the resulting nanomaterial properties. INTRODUCTION In the field of thermoelectric (TE) materials, the use of nanotechnology has been recognized as an effective avenue to increase the efficiency (ZT value) of the existing bulk materials [1]. The creation of TE materials with a nanoscale structure increases the phonon scattering along grain boundaries, ultimately suppressing the thermal conductivity, which increases the overall thermoelectric efficiency of the device [2]. As a result there has been renewed interest in this field with many researchers focusing on imparting nanoscale dimensions to the most promising bulk thermoelectric materials such as Bi2Te3 or (BixSby)Te100-x-y [1,3]. While simple nanostructuring has been demonstrated to be effective in increasing the TE efficiency, the use of true nanoparticles with controllable size, shape, structure and composition have the potential to be the most effective in this fiel
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