Doping Effect of Poly(vinylidene fluoride)on Carbon Nanofibers Deduced by Thermoelectric Analysis of Their Melt Mixed Films

扫码查看

原文链接

万方数据
维普

外文摘要：The effect of temperature on the electrical conductivity(a)and Seebeck coefficient(S)of n-type vapor grown carbon nanofibers(CNFs)and poly(vinylidene fluoride)(PVDF)melt-mixed with 15 wt％of those CNFs is analyzed.At 40 ℃,the CNFs show stable n-type character(S=-4.8μV·K-1)with an σof ca.165 S·m-1,while the PVDF/CNF composite film shows an σ of ca·9 S·m-1 and near-zero S(S=-0.5 μV·K-1).This experimental reduction in S is studied by the density functional tight binding(DFTB)method revealing a contact electron transfer from the CNFs to the PVDF in the interface.Moreover,in the temperature range from 40 ℃ to 100 ℃,the σ(T)of the CNFs and PVDF/CNF film,successfully described by the 3D variable range hopping(VRH)model,is explained as consequence of a thermally activated backscattering mechanism.On the contrary,the S(T)from 40 ℃ to 100 ℃ of the PVDF/CNF film,which satisfactorily matches the model proposed for some multi-walled carbon nanotube(MWCNT)doped mats;however,it does not follow the increase in S(T)found for CNFs.All these findings are presented with the aim of discerning the role of these n-type vapor grown carbon nanofibers on the σ and S of their melt-mixed polymer composites.

外文关键词：

Carbon nanofibersPoly(vinylidene fluoride)Seebeck coefficientP-type dopingDensity functional based tight bindingVariable range hopping

作者：

A.J.Paleo、V.M.Serrato、J.M.Mánuel、O.Toledano、E.Muñoz、M.Melle-Franco、B.Krause、P.Pötschke、K.Lozano

展开 >

作者单位：

2C2T-Centre for Textile Science and Technology,University of Minho,Campus de Azurém,4800-058 Guimarães,Portugal

Florida Institute of Technology,Melbourne,FL 32901,USA

The Aerospace Corporation,El Segundo,CA 90245,USA

Department of Condensed Matter Physics and Institute of Research on Electron Microscopy and Materials(IMEYMAT),Faculty of Sciences,University of Cádiz,Puerto Real,11510 Cádiz,Spain

CICECO-Aveiro Institute of Materials,Department of Chemistry,University of Aveiro,3810-193 Aveiro,Portugal

UNED-Universidad Nacional de Educación a Distancia,Av.de Esparta,s/n,28232,Las Rozas,Madrid,Spain

Facultad de Física,Pontificia Universidad Católica de Chile,Santiago,7820436,Chile

Leibniz-Institut für Polymerforschung Dresden e.V.(IPF),Hohe Str.6,01069 Dresden,Germany

Department of Mechanical Engineering,University of Texas Rio Grande Valley,Edinburg TX 78539,USA

展开 >

出版年：

2024

DOI：

10.1007/s10118-024-3200-y

高分子科学(英文版)

中国化学会　中国科学院化学研究所

高分子科学(英文版)

CSTPCD

影响因子：0.721

ISSN：0256-7679

年,卷(期)：2024.42(11)