Thermoelectric properties of p-type SrTiO3/graphene layers nanohybrids

We studied the thermoelectric properties of SrTiO3 and graphene layer(s) (GL) nanohybrids between 10 and 300 K as a function of GL loading. Thermopower measurements indicate that the nanohybrids are p-type materials with low S values of about 11–21 μV/K at room temperature. The p-type behavior of th...

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Bibliographic Details
Published in:Journal of applied physics 2019-05, Vol.125 (18)
Main Authors: Nath, Chandrani, Chueh, C.-Y., Kuo, Y.-K., Singh, J. P.
Format: Article
Language:English
Subjects:
Applied physics
Electrical resistivity
Graphene
Strontium titanates
Temperature
Temperature dependence
Thermal conductivity
Thermoelectricity
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Summary:We studied the thermoelectric properties of SrTiO3 and graphene layer(s) (GL) nanohybrids between 10 and 300 K as a function of GL loading. Thermopower measurements indicate that the nanohybrids are p-type materials with low S values of about 11–21 μV/K at room temperature. The p-type behavior of the hybrids has been ascribed to the electron accepting nature of GL that leads to the SrTiO3/GL system hole conducting. The temperature dependence of electrical resistivity shows a degenerate semiconducting behavior as indicated by its weak and negative temperature coefficient of resistivity. The room-temperature resistivity decreases by about three orders of magnitude with GL loading ranging from about 102 to 10−1 Ω cm. These nanohybrids exhibit an amorphous behavior of thermal conductivity with a low temperature plateau and a quasilinear increase at high temperatures. The thermoelectric performance ZT is estimated to be of the order of 10−5 at room temperature for 10% GL loaded SrTiO3.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.5090819