121st General Meeting of the KCS

Type Poster Presentation
Area Material Chemistry
Room No. Event Hall
Time 4월 20일 (금요일) 11:00~12:30
Code MAT.P-435
Subject Thermoelectric properties of shape-controlled Cu2-xSe nanocrystals and Na-doped Cu2-xSe nanoplate
Authors YINGSHI JIN, Sung-Jin Kim1,*, Mi-Kyung Han2, juhee an, Sujin Kim3
Department of Chemistry and Nano Science, Ewha Womans University, Korea
1Department of Chemistry, Ewha Womans University, Korea
2Division of Chemistry and Nano Science, Ewha Womans University, Korea
3Nano chemistry, Ewha Womans University, Korea
Abstract In this study, a β-phase Cu2-xSe nanowire and nanoplate were successfully synthesized via an aqueous approach. The morphologies of the Cu2-xSe nanowire and nanoplate could be easily tunable from plate to wire by changing synthetic conditions. Then a sodium doped Cu2-xSe nanoplate was prepared by a simple treatment of the Cu2-xSe nanoplate with a sodium hydroxide - ethylene glycol solution. The products as-obtained were characterized by X-ray diffraction (XRD), high-resolution transmission electron microscope (HR-TEM), scanning electron microscopy (SEM), and inductively coupled plasma - optical emission spectrometry (ICP-OES) to check the microstructure and compositions. The nanopowders were then consolidated to bulk materials using spark plasma sintering (SPS) to evaluate their thermoelectric properties. The results show that Na played two important roles: One is reducing the carrier concentration, thereby improving the Seebeck coefficient; the other is reducing the thermal conductivity. Overall, a maximum ZT value of 0.24 was obtained at 673 K in the Na-doped Cu2-xSe nanoplates.
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