TY - JOUR
T1 - Towards an efficient p-n heterojunction in ternary composite material based polypyrrole, metal oxide and surface functionalized graphene for thermoelectric properties enhancement
AU - Nedjar, Linda
AU - Mekki, Ahmed
AU - Bekkar Djelloul Sayah, Zakaria
AU - Cherfa, Mohamed-Cherif
AU - Lounes, Riane-Arezki
AU - Manseri, Amar
AU - Durastanti, Jean-Felix
AU - Mekhalif, Zineb
N1 - Publisher Copyright:
© 2023 Elsevier B.V.
PY - 2023/9/1
Y1 - 2023/9/1
N2 - The thermoelectric properties of ternary p-n heterojunction composites based on [p-type polymer/surface treated graphene/metal oxide in ceramic form] were investigated in this study. In the presence of ceramic tungsten oxide (WO
3) particles and diazonium salt surface treated graphene, a simple in-situ pyrrole polymerization method was carried out. FTIR, Raman scattering, X-ray diffraction analysis (XRD), diffuse reflectance UV-Vis spectroscopy, I-V characteristics, and scanning electron microscopy - energy dispersive spectrometer (SEM-EDS) have all been used to characterize composites. Based on the comparison of observed thermoelectric parameters, the ternary composite created by PPy-FrGO (DS-SO
3H)-WO
3 based on functionalized graphene with diazonium salt (DS-SO
3H) was chosen as having superior thermoelectric capabilities than the other samples. This advancement was made possible by combining two strategies: graphene functionalization with a conjugated diazonium salt and thermochemical treatment of tungsten oxide with the sol-gel method and sintering procedure. Functionalization reduced thermal conductivity (= 0.127 W.m
−1. K
−1) while adding ceramic tungsten oxide boosted electrical conductivity ( = 1087 S/m), resulting in a merit coefficient (ZT) of 1.63 × 10
−4.
AB - The thermoelectric properties of ternary p-n heterojunction composites based on [p-type polymer/surface treated graphene/metal oxide in ceramic form] were investigated in this study. In the presence of ceramic tungsten oxide (WO
3) particles and diazonium salt surface treated graphene, a simple in-situ pyrrole polymerization method was carried out. FTIR, Raman scattering, X-ray diffraction analysis (XRD), diffuse reflectance UV-Vis spectroscopy, I-V characteristics, and scanning electron microscopy - energy dispersive spectrometer (SEM-EDS) have all been used to characterize composites. Based on the comparison of observed thermoelectric parameters, the ternary composite created by PPy-FrGO (DS-SO
3H)-WO
3 based on functionalized graphene with diazonium salt (DS-SO
3H) was chosen as having superior thermoelectric capabilities than the other samples. This advancement was made possible by combining two strategies: graphene functionalization with a conjugated diazonium salt and thermochemical treatment of tungsten oxide with the sol-gel method and sintering procedure. Functionalization reduced thermal conductivity (= 0.127 W.m
−1. K
−1) while adding ceramic tungsten oxide boosted electrical conductivity ( = 1087 S/m), resulting in a merit coefficient (ZT) of 1.63 × 10
−4.
KW - Diazonium salt
KW - Functionalized graphene
KW - P-n heterojunction
KW - Polypyrrole
KW - Ternary composite
KW - Tungsten oxide
UR - http://www.scopus.com/inward/record.url?scp=85166985250&partnerID=8YFLogxK
U2 - 10.1016/j.synthmet.2023.117427
DO - 10.1016/j.synthmet.2023.117427
M3 - Article
SN - 0379-6779
VL - 298
JO - Synthetic Metals
JF - Synthetic Metals
IS - 117427
M1 - 117427
ER -