(Bi2Te3)1−x(PANI)x compositions- synthesis, structural, spectroscopic characterization with enhanced thermoelectric performance

热电效应 材料科学 塞贝克系数 热电材料 聚苯胺 差示扫描量热法 纳米复合材料 傅里叶变换红外光谱 扫描电子显微镜 极化子 结晶度 化学工程 聚合 分析化学(期刊) 纳米技术 聚合物 复合材料 热导率 化学 有机化学 电子 热力学 物理 工程类 量子力学
作者
M.S. Shalaby,Soraya Abdelhaleem,A. Sotelo
出处
期刊:Synthetic Metals [Elsevier BV]
卷期号:285: 117025-117025 被引量:10
标识
DOI:10.1016/j.synthmet.2022.117025
摘要

The coupling between semiconductor/ polymer compositions is one of the unique trials to attain outstanding nanocomposite thermoelectric materials. Herein, Bi 2 Te 3 /PANI composites prove their ability to achieve the physical properties of the thermoelectrics by the variation of stoichiometric concentrations. The in-situ polymerization method was utilized to obtain Bi 2 Te 3 /PANI compositions. The structural characteristics of the materials were investigated by X-ray diffraction (XRD). XRD, Scanning Electron Microscopy (SEM), and Transmission Electron Microscopy (TEM) confirm the homogeneous growth of PANI over the surface of Bi 2 Te 3 nanoparticles, affect on the order structure with low crystallinity during the polymerization. Fourier Transform Infrared Spectroscopy (FTIR) and Differential Scanning Calorimetry (DSC) analyses illustrate the π-π interactions of uniform PANI on Bi 2 Te 3 nanoparticles. The other strong interactions, including electrostatic and hydrogen bonding between Bi 2 Te 3 and PANI may construct a route to enhance the order of the structure of the chains and improve the thermoelectric performance. Distinctive revolutionize the electrical resistivity, Seebeck Coefficient, and the power factor with increased PANI concentrations, which improves thermoelectric performance. The spin concentration charge carriers were determined from Electron Spin Resonance (ESR) dependent on the PANI doping levels. The formation of polarons and bi-polarons were produced during the doping process represent the carriers in these systems. • Bi 2 Te 3 /PANI nano-compositions were successfully achieved via the in-situ polymerization technique. • Structural, topographic, thermal properties were tested for Bi 2 Te 3 /PANI compositions. • The enhancement of thermoelectric performance and the power factor for Bi 2 Te 3 /PANI composites increased with PANI concentration. • ESR identified the formation of polarons and bi-polarons. • Polarons and bi-polarons were produced during PANI increase which enhances charge carriers in Bi 2 Te 3 /PANI systems.
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