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Title: Synthesis and thermoelectric properties of Bi{sub 2}O{sub 2}Se nanosheets

Graphical abstract: Sheet-like Bi{sub 2}O{sub 2}Se is synthesized by composite-molten-salt (CMS) method. The film made from the as-synthesized Bi{sub 2}O{sub 2}Se nanosheets show very low thermal conductivity and high electrical conductivity. - Highlights: • Bi{sub 2}O{sub 2}Se nanosheets are synthesized by the composite-molten-salt approach. • Thermoelectric properties of a film consisting of Bi{sub 2}O{sub 2}Se are investigated. • The film shows very low thermal conductivity and high electrical conductivity. - Abstract: The pure tetragonal bismuth oxiselenide nanosheets are synthesized by the composite-molten-salt approach at 200 °C. 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 (κ{sub 300} = 0.346 Wm{sup −1} K{sup −1}, and κ{sub 470} = 0.458 Wm{sup −1} K{sup −1}). Although the obtained figure of merit is small, it would be enhanced with increase in temperature.
Authors:
 [1] ;  [1] ;  [2] ; ;  [1] ;  [2]
  1. Department of Applied Physics, Chongqing University, Chongqing 400044 (China)
  2. State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100 (China)
Publication Date:
OSTI Identifier:
22285126
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 48; Journal Issue: 10; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COLD PRESSING; MOLTEN SALTS; NANOSTRUCTURES; SCANNING ELECTRON MICROSCOPY; SEMICONDUCTOR MATERIALS; SYNTHESIS; TEMPERATURE RANGE 0273-0400 K; THERMOELECTRIC PROPERTIES; X-RAY DIFFRACTION