Paper Title
EXPERIMENTAL AND MODELING ANALYSIS OF P-TYPE BI0.4SB1.6TE3 AND GRAPHENE NANOCOMPOSITES

Abstract
Abstract - The state-of-the-art Bismuth-Telluride (Bi2Te3) based systems are promising thermoelectric materials for efficient thermoelectric applications. In this study, the effect of graphene nanosheets (GNS) integrity on thermoelectric properties of a p-type Bi0.4Sb1.6Te3 alloy has been studied using high-energy ball milling and SPS sintering techniques. The synthesized pristine Bi0.4Sb1.6Te3 and 0.05wt% GNS/Bi0.4Sb1.6Te3nanocomposites at different addition times of GNS have exhibited a single-phase and artifact-free bulk nanocrystalline Bi0.4Sb1.6Te3 with nanocrystals size of 17nm. The TEM analysis confirmed the mechanical exfoliation of graphene filler in 5mnanocomposite into a single-layered nanostructure with an interplanar spacing of 0.343 nm. The prominent Raman features of the monolayered graphene sheet have appeared in the synthesized 5m-GNS/Bi0.4Sb1.6Te3 nanocomposite. This highlighted the crucial rule of graphene addition time on its structure and morphology of the synthesized nanocomposites. The ZT profile of 5mnanocomposite reached 0.801 at 348K till 398K. This resulted in 65% of improvements to the pristine Bi0.4Sb1.6Te3 pellet at 323K. The obtained results were used to simulate a thermoelectric (TE) device module using ANSYS Workbench. The GNS nanocomposites have shown an ultrahigh output power of 95.57W compared to 89.96W for the pristine module at ΔT of 150ºC. The GNS addition has increased the output power of pristine Bi0.4Sb1.6Te3 by 7%, leading to comparable TE performance to other simulated Bi2Te3 systems. Keywords - Thermoelectric Conversion; Graphene; Bismuth Telluride Alloys; Mechanical Synthesis, Modeling.