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Interface-engineered SrTiO3/graphene oxide nanocomposites for enhanced thermoelectric performance.

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Title: Interface-engineered SrTiO3/graphene oxide nanocomposites for enhanced thermoelectric performance.
Authors: Yalini Devi, N.1,2 (AUTHOR) ydyalini@gmail.com, Sivakumar, M.1 (AUTHOR), Alagar Nedunchezhian, A.S.3 (AUTHOR), Jayavel, R.4 (AUTHOR), Arivanandhan, M.1 (AUTHOR) arivucz@gmail.com
Source: Ceramics International. Jun2026:Part C, Vol. 52 Issue 14, p26310-26318. 9p.
Subjects: Nanocomposite materials, Thermoelectric effects, Hydrothermal synthesis, Strontium titanate, Seebeck coefficient, Thermoelectric power, Graphene oxide
Abstract: SrTiO 3 /GO nanocomposites were prepared by increasing the hydrothermal growth period to 12, 24 and 48 h. For comparative studies, SrTiO 3 /GO nanocomposite was prepared by co-precipitation (CP) method. The X-Ray Diffraction (XRD) pattern confirms the cubic crystal structure of the synthesized samples. The grain growth from spherical to cubic and size with respect to the growth period was confirmed by High Resolution Scanning Electron Microscopy (HR - SEM) and Transmission Electron Microscopy (TEM). The functional groups in GO and SrTiO 3 /GO were studied by Fourier Transform Infra-Red spectroscopy (FTIR). The formation of SrTiO 3 /GO composites was once again confirmed by the Raman Spectroscopy. The ρ of 48 h samples were relatively higher than that of all other samples. The 48h growth sample shows high Seebeck coefficient of −334 μV/K at 550 K compared to pristine STGOCP sample (-127 μV/K at 550 K). The power factor was calculated using ρ and S for all the samples. The 48-h sample shows comparatively highpower factor of 214 μWm−1K−2 at 550 K compared to the all-other samples. In addition, the composite prepared at 48 h exhibited relatively higher figure of merit (zT) of 0.13 at 550 K compared to other samples due to its low thermal conductivity. Thus, GO plays a significant role in improving the power factor and zT of SrTiO 3 /GO nanocomposites. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:SrTiO 3 /GO nanocomposites were prepared by increasing the hydrothermal growth period to 12, 24 and 48 h. For comparative studies, SrTiO 3 /GO nanocomposite was prepared by co-precipitation (CP) method. The X-Ray Diffraction (XRD) pattern confirms the cubic crystal structure of the synthesized samples. The grain growth from spherical to cubic and size with respect to the growth period was confirmed by High Resolution Scanning Electron Microscopy (HR - SEM) and Transmission Electron Microscopy (TEM). The functional groups in GO and SrTiO 3 /GO were studied by Fourier Transform Infra-Red spectroscopy (FTIR). The formation of SrTiO 3 /GO composites was once again confirmed by the Raman Spectroscopy. The ρ of 48 h samples were relatively higher than that of all other samples. The 48h growth sample shows high Seebeck coefficient of −334 μV/K at 550 K compared to pristine STGOCP sample (-127 μV/K at 550 K). The power factor was calculated using ρ and S for all the samples. The 48-h sample shows comparatively highpower factor of 214 μWm−1K−2 at 550 K compared to the all-other samples. In addition, the composite prepared at 48 h exhibited relatively higher figure of merit (zT) of 0.13 at 550 K compared to other samples due to its low thermal conductivity. Thus, GO plays a significant role in improving the power factor and zT of SrTiO 3 /GO nanocomposites. [ABSTRACT FROM AUTHOR]
ISSN:02728842
DOI:10.1016/j.ceramint.2026.04.181