Synthesis and thermoelectric properties of Bi₂O₂Se nanosheets

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• 作者：Kaiyou Zhang ; Chenguo Hu ; Xueliang Kang ; Shuxia Wang ; Yi Xi ; Hong Liu
• 关键词：A. Nanostructures ; A. Semiconductors ; B. Chemical synthesis ; C. X-ray diffraction ; D. Thermal conductivity
• 刊名：Materials Research Bulletin
• 出版年：2013
• 出版时间：October, 2013
• 年：2013
• 卷：48
• 期：10
• 页码：3968-3972
• 全文大小：1100 K

文摘

The pure tetragonal bismuth oxiselenide nanosheets are synthesized by the composite-molten-salt approach at 200 ¡ãC. Field emission scanning electron microscopy, X-ray diffraction, and energy dispersive X-ray spectroscopy are used to characterize the structure, morphology, and composition of the sample. The results show that the thickness of the nanosheets is about 120 nm. The sample for thermoelectric property measurements is prepared using cold pressing method. Thermoelectric properties, including electrical conductivity, Seebeck coefficient and thermal conductivity, are measured from room temperature to 470 K. The results show that the sample exhibits n-type semiconductor behavior with low thermal conductivity (¦Ê₃₀₀ = 0.346 Wm^?1 K^?1, and ¦Ê₄₇₀ = 0.458 Wm^?1 K^?1). Although the obtained figure of merit is small, it would be enhanced with increase in temperature.