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

作　　者：A.J.Paleo V.M.Serrato J.M.Mánuel O.Toledano E.Muñoz M.Melle-Franco B.Krause P.Põtschke K.Lozano 

机构地区：[1]2C2T-Centre for Textile Science and Technology,University of Minho,Campus de Azurém,4800-058,Guimarães,Portugal [2]Florida Institute of Technology,Melbourne,FL,32901,USA [3]The Aerospace Corporation,El Segundo,CA,90245,USA [4]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 [5]CICECO-Aveiro Institute of Materials,Department of Chemistry,University of Aveiro,3810-193,Aveiro,Portugal [6]UNED-Universidad Nacional de Educación a Distancia,Av.de Esparta,s/n,Las Rozas,28232,Madrid,Spain [7]Facultad de Física,Pontificia Universidad Católica de Chile,Santiago,7820436,Chile [8]Leibniz-Institut für Polymerforschung Dresden e.V.(IPF),Hohe Str.6,01069,Dresden,Germany [9]Department of Mechanical Engineering,University of Texas Rio Grande Valley,Edinburg,TX,78539,USA

出　　处：《Chinese Journal of Polymer Science》2024年第11期1802-1810,I0013,共10页高分子科学（英文版）

基　　金：financially supported by the European Regional Development Fund through the Operational Competitiveness Program and the National Foundation for Science and Technology of Portugal(FCT)(No.UID/CTM/00264/2020 of Centre for Textile Science and Technology(2C2T)on its components Base and programmatic);support from project GreenAuto-Green Innovation for the Automotive Industry-PPS 3-Technical Textiles for the vehicle(Refa C6448637037-00000013)financed by EU funds,through the Plano de Recuperacao e Resiliência(PRR),managed by IAPMEI,I.P.-Agência para a Competitividade e Inovacao;support within the scope of the project CICECO-Aveiro Institute of Materials,UIDB/50011/2020,UIDP/50011/2020&LA/P/0006/2020,financed by national funds through the FCT/MCTES(PIDDAC);support from the Spanish Ministry of Universities with European Union funds-Next Generation EU through a Margarita Salas fellowship;support received from National Science Foundation under PREM award DMR 2122178。

摘　　要：The effect of temperature on the electrical conductivity(σ)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°C,the CNFs show stable n-type character(S=-4.8μV·K^(-1))with anσof ca.165 S·m^(-1),while the PVDF/CNF composite film shows anσof ca.9 S·m^(-1)and near-zero S(S=-0.5μV·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°C to 100°C,theσ(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°C to 100°C 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 theσand S of their melt-mixed polymer composites.

关 键 词：Carbon nanofibers Poly(vinylidene fluoride) Seebeck coefficient P-type doping Density functional based tight binding Variable range hopping 

分 类 号：TQ342.742[化学工程—化纤工业] TB383.1[一般工业技术—材料科学与工程]