Thermoelectric properties of p-type SrTiO3/graphene layers nanohybrids

Abstract

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.

Thermoelectric, Magnetic, and Mechanical Characteristics of Antiferromagnetic Manganese Telluride Reinforced with Graphene Nanoplates

“…[15][16][17][18] As such, in the field of energy conversion, graphene products have been used in developing new thermoelectric (TE) compounds. [5,[19][20][21][22][23] However, it may be unrealistic to expect to simultaneously achieve all the improving features by incorporating graphene compounds into TE materials. The TE material is often evaluated by the dimensionless figure of merit factor (zT ), where zT ¼ S 2 σ κ T, S is the Seebeck coefficient, σ is the electrical conductivity, κ is the thermal conductivity, and T is the absolute temperature.…”