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Title: Effects of additions of carbon nanotubes on the thermoelectric properties of Ni{sub 0.05}Mo{sub 3}Sb{sub 5.4}Te{sub 1.6}

To prepare Ni{sub 0.05}Mo{sub 3}Sb{sub 5.4}Te{sub 1.6}, the starting materials were loaded in the stoichiometric ratio into silica tubes and then heated at 1000 K. The reaction products were mixed and divided into four equal parts. The first sample was used as a reference sample called bulk. For the remaining samples, 1%, 2% and 3% by mass of MWCNT (multi-wall carbon nanotubes) were added by ball-milling. These materials were then subjected to consolidation by hot-pressing at 850 K and 56 MPa. Their transport properties were determined and compared to study the influence of MWCNT on the transport properties of Ni{sub 0.05}Mo{sub 3}Sb{sub 5.4}Te{sub 1.6}. Scanning and transmission electron microscopy were used to study the microstructural and nanostructural features of the samples, and Raman characterization was performed to look for changes induced by ball-milling and hot-pressing of the nanotubes. Mainly due to a largely reduced thermal conductivity by 40% and a slightly reduced power factor, the figure-of-merit was improved by 25% after addition of 3 mass% of MWCNT. - Graphical abstract: Figure-of-merit of various Ni{sub 0.05}Mo{sub 3}Sb{sub 5.4}Te{sub 1.6}/CNT composites. - Highlights: • Various composites of Ni{sub 0.05}Mo{sub 3}Sb{sub 5.4}Te{sub 1.6} with carbon nanotubes were synthesized and characterized. • In eachmore » case, the thermoelectric figure-of-merit increases rapidly with increasing temperature. • With increasing amount of carbon nanotubes, the thermal conductivity decreases more than the electrical conductivity. • The composite with 3% carbon nanotubes performs better than the bulk material by 25%.« less
Authors:
 [1] ;  [2] ;  [1]
  1. Department of Chemistry and Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, ON, Canada N2L 3G1 (Canada)
  2. Bordeaux INP, ICMCB, UPR 9048, 33600 Pessac (France)
Publication Date:
OSTI Identifier:
22475650
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 226; Other Information: Copyright (c) 2015 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:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 77 NANOSCIENCE AND NANOTECHNOLOGY; ANTIMONIDES; CARBON NANOTUBES; ELECTRIC CONDUCTIVITY; HOT PRESSING; MICROSTRUCTURE; MILLING; MOLYBDENUM TELLURIDES; NANOCOMPOSITES; NICKEL COMPOUNDS; POWER FACTOR; SCANNING ELECTRON MICROSCOPY; SILICA; TEMPERATURE DEPENDENCE; THERMAL CONDUCTIVITY; THERMOELECTRIC PROPERTIES; TRANSMISSION ELECTRON MICROSCOPY