Towards new thermoelectrics : tin selenide/modified graphene oxide nanocomposites
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New nanocomposites have been prepared by combining tin selenide (SnSe) with graphene oxide (GO) in a simple aqueous solution process followed by ice templating (freeze casting). The resulting integration of SnSe within the GO matrix leads to modifications of electrical transport properties and the possibility of influencing the power factor (S2σ). Moreover, these transport properties can then be further improved (S, σ increased) by funtionalisation of the GO surface to form modified nanocomposites (SnSe/GOmod) with enhanced power factors in comparison to unmodified nanocomposites (SnSe/GO) and “bare” SnSe itself. Functionalising the GO by reaction with octadecyltrimethoxysilane (ODTS; C21H46O3Si) and triethylamine (TEA;(CH3CH2)3N) switches SnSe from p-type to n-type conductivity with an appreciable Seebeck coefficient and high electrical conductivity (1257 S·m-1 at 539 K); yielding a 20-fold increase in the power factor compared to SnSe itself, prepared by the same route. These findings present new possibilities to design inexpensive and porous nanocomposites based on metal chalcogenides and functionalized carbon-derived matrices.
Protsak , I , Champet , S , Chiang , C-Y , Zhou , W , Popuri , S , Bos , J-W , Misra , D , Morozov , Y & Gregory , D 2019 , ' Towards new thermoelectrics : tin selenide/modified graphene oxide nanocomposites ' , ACS Omega , vol. 4 , no. 3 , pp. 6010-6019 . https://doi.org/10.1021/acsomega.8b03146
Copyright © 2019 American Chemical Society. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1021/acsomega.8b03146
DescriptionThis work was financially supported by the EPSRC (EP/P510968/1).
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