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An Alternating-Current Voltage Modulated Thermal Probe Technique for Local seebeck coefficient Characterization

Chinese Physics Letters 2014年第12期31卷 92-94页

作者：徐琨淇曾华荣于会珠赵坤宇李国荣宋君强史迅陈立东 Key Laboratory of Inorganic Functional Materials and Devices Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai 200050 University of Chinese-Academy ofSciences Beijing 100039 State Key Laboratory of High Performance Ceramics and Superfine Microstructures Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai 200050

Nanostructured and nanocomposite thermoelec- tric materials have recently attracted a great deal of attention due to the optimization of thermal and electrical transports for high thermoelectric performance The initial ideas for the applica- tions of nano-structures in thermoelectric materials are that the lattice thermal conductivity can be de- pressed by the scattering of nano-particles or nano- boundaries as well as the enhanced electron density of states at the Fermi level. The latter is expected to enhance seebeck coefficients due to the fact that the low energy carriers can be filtered by nano-sized grain boundaries. Lowered thermal conductivity and enhanced thermoelectric figure of merit have been ob- served in lots of bulk materials with nanostructures or nano-impurities. However, the thermal and electrical transports in these nano-materials are usually mea- sured by normal commercial systems, in which only the statistical values of the transports are obtained. The characterization of local thermoelectric parame- ters still remains a challenging task at the submicro, even nanometer level as a powerful tool for Scanning probe microscopy nanostructure imaging and local properties characterization, has become a promis- ing technique for measuring local thermal and electri- cal properties, like scanning tunneling microscopy, scanning thermal microscopy, and scanning Joule expansion microscopy. Recent work has demon- strated simultaneously determined the thermal con- ductivity and Seebeek coefficient of Bi2Se3 thin film by a microprobe technique.

关键词： ALTERNATING currents ELECTRIC potential THERMAL analysis seebeck coefficient ATOMIC force microscopes THERMOELECTRIC effects

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Large seebeck coefficient resulting from chiral interactions in triangular triple quantum dots

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Chinese Physics B 2022年第9期31卷 460-467页

作者： Yi-Ming Liu Jian-Hua Wei Department of Physics Renmin University of ChinaBeijing 100872China

We theoretically study thermoelectric transport properties through a triangular triple-quantum-dot(TTQD)structure in the linear response regime using the hierarchical equations of motion *** is demonstrated that large seebeck coefficient can be obtained when properly matching the interdot tunneling strength and magnetic flux at the electron-hole symmetry point,as a result of spin chiral interactions in the TTQD *** present a systematic investigation of the thermopower(the seebeck coefficient)dependence on the tunneling strength,magnetic flux,and on-site *** seebeck coefficient shows a clear breakdown of electron-hole symmetry in the vicinity of the Kondo regime,accompanied by the deviation from the semiclassical Mott relation in the Kondo and mixed-valence regimes,which result from the many-body effects of the Kondo correlated induced resonance together with spin chiral interactions.

关键词： quantum dots seebeck coefficient thermoelectric transport

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Synthesis,Electrical Conductivity and seebeck coefficient of La_(0.9)A_(0.1)FeO_3(A=Mg,Ca,Sr,Ba)

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Journal of Materials Science & Technology 2010年第12期26卷 1103-1106页

作者： Na Yin Hongchao Wang Chunlei Wang School of Physics State Key Laboratory of Crystal Materials Shandong University Jinan 250100 China

Lanthanum ferrites ceramics La0.9A0.1FeO3 （A=Mg, Ca, Sr, Ba） have been prepared by solid state reaction. X-ray power diffraction analysis reveals that all samples are of pure perovskite structure with orthorhombic phase. Electrical conductivity and seebeck coefficient have been measured in vacuum within the temperature range between room temperature and 800℃. The electrical conductivity shows semiconducting behavior. Temperature dependence of electrical conductivity indicates that adiabatic small-polaron hopping mechanism is dominant for their electric transportations. seebeck coefficients are positive for samples, suggesting ptype conduction in the whole temperature range. The highest seebeck coefficient is found to be 654 μV/K for La0.9A0.1FeO3. Except La0.9A0.1FeO3, the electrical conductivity of La0.9A0.1FeO3 increases with increasing atomic number of the A-site element, while seebeck coefficient decreases.

关键词： La0.9A0.1FeO3 ceramics Electrical conductivity seebeck coefficient

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Two-dimensional SnP_(2)Se_(6) with gate-tunable seebeck coefficient for telecommunication band photothermoelectric detection

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InfoMat 2024年第10期6卷 19-30页

作者： Bing-Xuan Zhu Cheng-Yi Zhu Jing-Kai Qin Wen He Lin-Qing Yue Pei-Yu Huang Dong Li Ruo-Yao Sun Sheng Ye Yu Du Jie-He Sui Ming-Yu Li Jun Mao Liang Zhen Cheng-Yan Xu School of Integrated Circuits Harbin Institute of Technology(Shenzhen)Shenzhenthe People's Republic of China Sauvage Laboratory for Smart Materials School of Materials Science and EngineeringHarbin Institute of Technology(Shenzhen)Shenzhenthe People's Republic of China MOE Key Laboratory of Micro-Systems and Micro-Structures Manufacturing Harbin Institute of TechnologyHarbinthe People's Republic of China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbinthe People's Republic of China

Photothermoelectric (PTE) detectors combine photothermal and thermoelectricconversion, surmounting material band gap restrictions and limitations related tomatching light wavelengths, have been widely used in telecommunication banddetection. Two-dimensional (2D) materials with gate-tunable seebeck coefficientcan induce the generation of photothermal currents under illumination by theasymmetric seebeck coefficient, making them promising candidate for PTE detectorsin the telecommunication band. In this work, we report that a newly exploredvan der Waals (vdW) layered material, SnP_(2)Se_(6), possessing excellent field regulationcapabilities and behaviors as an ideal candidate for PTE detector *** the assistance of temperature-dependent Raman characterization, thesuspended atomic thin SnP_(2)Se_(6) nanosheets reveal thickness-dependent thermalconductivity of 1.4–5.7 W m^(-1) K^(-1) at room temperature. The 2D SnP_(2)Se_(6) demonstrateshigh seebeck coefficient (S) and power factor (PF), which are estimated tobe -506 μV K^(-1) and 207 μWm^(-1) K^(-2), respectively. By effectively modulating theSnP_(2)Se_(6) localized carrier concentration, which in turn leads to inhomogeneousseebeck coefficients, the designed dual-gate PTE detector with 2D SnP_(2)Se_(6) channeldemonstrates wide spectral photoresponse in telecommunication bands, yieldinghigh responsivity (R = 1.2 mA W^(-1)) and detectivity (D^(*) = 6× 10^(9) Jones)under 1550 nm light illumination. Our findings provide a new material platformand device configuration for the telecommunication band detection.

关键词： photodetection photothermoelectric effect seebeck coefficient telecommunication bands two-dimensional semiconductor

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A Potential Approach to Enhance the seebeck coefficient of UHMWPE by Using the Graphene Oxide

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Non-Metallic Material Science 2020年第2期2卷 21-27页

作者： Aqsa Irfan Malik Naqash Mehmood Malik Sajjad Mehmood Arif Aziz Mansoor Ahmad Baluch Muhammad Rizwan Tariq Yasin Department of Basic Science University of Engineering and TechnologyTaxila47050Pakistan Department of Physics Air University444000IslamabadPakistan Harbin Engineering University HarbinHeilingjiang150001China Department of Chemistry Pakistan Institute of Engineering and Applied Sciences45650IslamabadPakistan

Thermoelectric materials have been a competent source for the production of energy in the present *** most important and potential parameter required for the material to have better thermoelectric characteristics is the seebeck *** this work,ultra high molecular weight polyethylene(UHMWPE)and graphene oxide(GO)nanocomposites were prepared by mechanical mixing by containing 10000ppm,50000ppm,70000ppm,100000ppm,150000ppm,and 200000ppm loadings of graphene *** to the intrinsic insulating nature of UHMWPE,the value of seebeck for pristine UHMWPE and its nanocomposites with 10000ppm&50000ppm of GO concentration was too low to be ***,the seebeck coefficient for composites with 70000ppm,100000ppm,150000ppm,and 200000ppm loadings of GO was found to be 180,206,230,and 235μV/K,*** higher values of seebeck coefficients were attributed to the superior thermal insulating nature of UHMWPE and the conductive network induced by the GO within the UHMWPE insulating ***,the values of the figure of merit and power factor were negligibly small due to the lower concentration of charge carriers in UHMWPE/GO nanocomposites but still reported,results are extremely hopeful for considering the composite as the potential candidate for thermoelectric applications.

关键词： UHMWPE Graphene oxide Electrical conductivity Thermal conductivity seebeck coefficient Figure of merit

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Optical and electrical properties of InGaZnON thin films

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Chinese Physics B 2020年第1期29卷 475-481页

作者： Jian Ke Yao Fan Ye Ping Fan Shenzhen Key Laboratory of Advanced Thin Films and Applications College of Physics and EnergyShenzhen UniversityShenzhen 518060China

The substrate temperature(Ts)and N2 partial pressure(PN2)dependent optical and electrical properties of sputtered InGaZnON thin films are *** the increased Ts and PN2,the thin film becomes more crystallized and *** Hall mobility,free carrier concentration(Ne),and electrical conductivity increase with the lowered interfacial potential barrier during crystal *** photoluminescence(PL)intensity decreases with the increased *** band gap(Eg)narrows and the linear refractive index(n1)increases with the increasing concentration of N in the thin *** Stokes shift between the PL peak and absorption edge decreases with *** n1,dispersion energy,average oscillator wavelength,and oscillator length strength all increase with *** single oscillator energy decreases with *** nonlinear refractive index and third order optical susceptibility increase with *** seebeck coefficient,electron effective mass,mean free path,scattering time,and plasma energy are all Ne dependent.

关键词： InGaZnON thin films linear and nonlinear optical properties seebeck coefficient electron effective mass

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Influence of modulation period for β-Cu2+xSe/SiC nano-multilayer films on their thermoelectric properties

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Progress in Natural Science:Materials International 2022年第5期32卷 586-593页

作者： Guihong Song Yu Chen Hao Du Xiaoyuan Wei Guipeng Li Yusheng Wu Junhua You Fang Hu School of Materials Science and Technology Shenyang University of Technology Guangzhou Maritime University Institute of Corrosion Science and Technology

In this study, β-Cu2+xSe/SiC nano-multilayer films with different modulation period were successfully deposited on SiO2/Si substrates by sputtering alternately using Cu–Se and SiC targets. The deposited films were observed on both surface and cross-section, and the thermoelectric properties were studied. The results show that both carrier concentration and mobility at room temperature decreased with the reducing modulation period for the nanomultilayer films. The conductivity slightly decreased and seebeck coefficient greatly increased with the reducing modulation period. As a result of competition, the power factor of the nano multilayer films increased with the reducing modulation period because the positive effect of the seebeck coefficient exceeded the negative effect of the conductivity. In the case of β-Cu2+xxSe/SiC nano multilayer film with the smallest modulation periods(210 nm), the power factor reached 0.39 mWm-1K-2and 0.59 mWm-1K-2at room temperature and 325°C,respectively. The enhanced power factor for nano multilayer films is attributed to the scattering process at theβ-Cu2+xSe/SiC layer interface, which reduces the carrier concentration and the mobility. It is concluded that the thermoelectric properties of β-Cu2+xSe films can be effectively improved by designing nano multilayer structure.

关键词： Thermoelectric materials β-Cu2-xSe/SiC multilayer Films seebeck coefficient Layer interface scattering Modulation period

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

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Chinese Journal of Polymer Science 2024年第11期42卷 1802-1810,I0013页

作者： A.J.Paleo V.M.Serrato J.M.Mánuel O.Toledano E.Muñoz M.Melle-Franco B.Krause P.Põtschke K.Lozano 2C2T-Centre for Textile Science and Technology University of MinhoCampus de Azurém4800-058GuimarãesPortugal Florida Institute of Technology MelbourneFL32901USA The Aerospace Corporation El SegundoCA90245USA Department of Condensed Matter Physics and Institute of Research on Electron Microscopy and Materials(IMEYMAT) Faculty of SciencesUniversity of CádizPuerto Real11510CádizSpain CICECO-Aveiro Institute of Materials Department of ChemistryUniversity of Aveiro3810-193AveiroPortugal UNED-Universidad Nacional de Educación a Distancia Av.de Espartas/nLas Rozas28232MadridSpain Facultad de Física Pontificia Universidad Católica de ChileSantiago7820436Chile Leibniz-Institut für Polymerforschung Dresden e.V.(IPF) Hohe Str.601069DresdenGermany Department of Mechanical Engineering University of Texas Rio Grande ValleyEdinburgTX78539USA

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 *** 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 ***,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 *** 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 *** 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

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Effect of Polyaniline/manganese Dioxide Composite on the Thermoelectric Effect of Cement-based Materials

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Journal of Wuhan University of Technology(Materials Science) 2023年第1期38卷 109-116页

作者：季涛 LIAO Xiao HE Yan 张士萍 ZHANG Xiaoying ZHANG Xiong LI Weihua School of Architecture and Civil Engineering Nanjing Institute of TechnologyNanjing 211167China College of Civil Engineering Qingdao University of TechnologyQingdao 266033China School of Civil Engineering Suzhou University of Science and TechnologySuzhou 215011China School of Materials Science and Engineering Tongji UniversityShanghai 201804China School of Chemical Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China

To enhance the thermoelectric effect of cement-based materials,conductive polyaniline(PANI)modified MnO_(2)powder was synthesized and used as a thermoelectric component in the cement *** nanostructured PANI was deposited on the surface of the nanorod-shapedα-MnO_(2)particle and the weight ratio of PANI to MnO_(2)was 22.3:77.7 in the *** synthesized PANI/MnO_(2)composite was nanostructured according to the SEM *** test results of the thermoelectric properties proved that the PANI/MnO_(2)composite was effective as the seebeck coefficient and electrical conductivity values of the cement composites with PANI/MnO_(2)inside were 3-4 orders of magnitude higher than those of pure cement paste and the thermal conductivity values of these cement samples were *** obtained maximum figure of merit(ZT)value(2.75×10^(-3))was much larger than that of conductive materials reinforced cement-based *** thermoelectric effect of cement composites is mainly enhanced by the increased seebeck coefficient and electrical conductivity in this work.

关键词： PANI/MnO_(2)composite cement composites thermoelectric effect seebeck coefficient electrical conductivity

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Enhanced thermoelectric performance of spark plasma sintered p-type Ca_(3-x)Y_(x)Co_(4)O_(9+δ)systems

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Journal of Materials Science & Technology 2020年第20期52卷 212-222页

作者： J.S.Cha D.H.Kim H.Y.Hong K.Park Faculty of Nanotechnology and Advanced Materials Engineering Sejong UniversitySeoul05006Republic of Korea

Highly textured dense Ca3-xYxCo4 O9+δ(0≤x≤0.3)samples were fabricated by combining sol-gel process with spark plasma sintering(SPS).Y^3+substitution for Ca^2+simultaneously increased the seebeck coefficient and reduced the thermal *** latter was attributed to the increase in lattice anharmonicity,structural distortion,and grain boundary area,which enhanced the phonon ***2.7Y0.3Co4 O9+δshowed the largest dimensionless figure-of-merit(ZT=0.194)at 1073 K because it had the largest seebeck coefficient and the lowest thermal *** ZT value was 55%larger than that of undoped Ca3 Co4 O9(0.125 at 1073 K).Therefore,Y^3+substitution,sol-gel powder synthesis,and SPS are highly effective for enhancing the thermoelectric prope rties of Ca_(3)Co_(4)O_(9).

关键词： Electrical conductivity Ca_(3)Co_(4)O_(9) Thermoelectric properties seebeck coefficient Thermal conductivity Spark plasma sintering

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