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Ünal, Derya
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article
Improving the zT value of thermoelectrics by nanostructuring
Abstract
<p>A systematic study on the microwave-assisted thermolysis of the single source precursor (Et<sub>2</sub>Sb)<sub>2</sub>Te (1) in different asymmetric 1-alkyl-3-methylimidazolium- and symmetric 1,3-dialkylimidazolium-based ionic liquids (ILs) reveals the distinctive role of both the anion and the cation in tuning the morphology and microstructure of the resulting Sb<sub>2</sub>Te<sub>3</sub> nanoparticles as evidenced by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), and X-ray photoelectron spectroscopy (XPS). A comparison of the electrical and thermal conductivities as well as the Seebeck coefficient of the Sb<sub>2</sub>Te<sub>3</sub> nanoparticles obtained from different ILs reveals the strong influence of the specific IL, from which C<sub>4</sub>mimI was identified as the best solvent, on the thermoelectric properties of as-prepared nanosized Sb<sub>2</sub>Te<sub>3</sub>. This work provides design guidelines for ILs, which allow the synthesis of nanostructured thermoelectrics with improved performances.</p>