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}

Journal Article · Sun Mar 15 00:00:00 EDT 2015 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/J.JSSC.2015.02.016· OSTI ID:22475650

Nandihalli, Nagaraj ^[1]; Gorsse, Stéphane ^[2]; Kleinke, Holger ^[1]

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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)

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 each 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%.

• OSTI ID: 22475650
• Journal Information: Journal of Solid State Chemistry, Vol. 226; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

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