Effect of hydrothermal growth period on structural, morphological and thermoelectric properties of SrTiO3 /GO nanocomposites

Abstract

Abstract SrTiO3 and SrTiO3/GO nanocomposites were synthesized by varying hydrothermal reaction period as 12, 24 and 48 h. XRD analysis confirms the crystal structure of prepared samples. Morphological changes from spherical to cubic with increased growth period was confirmed by SEM and TEM. The functional groups in GO and SrTiO3/GO were studied by FTIR. From Raman Spectrum, Id/Ig ratio was calculated which reveals the formation of GO. The electrical resistivity of 48 h samples were relatively lower than that of other samples. Seebeck Coefficient of 24 h and 48 h samples were higher than that of as prepared sample. From the obtained Seebeck coefficient and electrical resistivity, the power factor was calculated. The 48 h sample exhibited relatively high power factor of 0.70 × 10− 6 Wm− 1K− 2 at 450 K compared to other samples. Thus, GO plays an important role in enhancing the power factor of SrTiO3/GO nanocomposites.