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Measuring the thermal conductivity and interfacial thermal resistance of suspended MoS2 using electron beam self-heating technique

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Science Bulletin 2018年第7期63卷 452-458页

作者： Adili Aiyiti xue Bai Jing Wu xiangfan xu Baowen Li Center for Phononics and Thermal Energy Science School of Physics Science and Engineering Tongji University Shanghai 200092 China China-EU Joint Centerfor Nanophononics School of Physics Science and Engineering Tong ji University Shanghai 200092 China Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology School of Physics Science and Engineering Tongji University Shanghai 200092 China NUS Graduate School for Integrative Sciences and Engineering National University of Singapore Kent Ridge 119620 Singapore Institute of Materials Research and Engineering (IMRE) 2 Fusionopolis Way Innovis #08-03 138634 Singapore Department of Mechanical Engineering University of Colorado Boulder CO 80309-0427 USA

Establishment of a new technique or extension of an existing technique for thermal and thermoelectric measurements to a more challenging system is an important task to explore the thermal and thermoelectric properties of various materials and systems. The bottleneck lies in the challenges in measuring the thermal contact resistance. In this work, we applied electron beam self-heating technique to derive the intrinsic thermal conductivity of suspended Molybdenum Disulfide （MoS2） ribbons and the thermal contact resistance, with which the interracial thermal resistance between few-layer MoS2 and Pt electrodes was calculated. The measured room temperature thermal conductivity of MoS2 is around -30 W/（m K）, while the estimated interracial thermal resistance is around -2 × 10 -6 m-2 K/W. Our experiments extend a useful branch in application of this technique for studying thermal properties of suspended layered ribbons and have potential application in investigating the interracial thermal resistance of different twodimensional （2D） heterojunctions.

关键词： MoS2 Thermal conductivity Thermal resistance E-Beam self-heating technique

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Tunable Thermal Conductivity of Ferroelectric P(VDF-TrFE)Nanofibers via Molecular Bond Modulation

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Chinese Physics Letters 2022年第12期39卷 50-56页

作者： Lan Dong Bohai Liu Yuanyuan Wang xiangfan xu School of Energy and Materials Shanghai Polytechnic UniversityShanghai 201209China Shanghai Engineering Research Center of Advanced Thermal Functional Materials Shanghai Polytechnic UniversityShanghai 201209China Center for Phononics and Thermal Energy Science China-EU Joint Center for NanophononicsSchool of Physics Science and EngineeringTongji UniversityShanghai 200092China

Dipoles in ferroelectric copolymer P(VDF-Tr FE)can be driven by electric field,introducing phonon transport modulations via polarizing molecular *** thermal conductivity in single 75/25 P(VDF-Tr FE)nanofibers is found to increase with electric field related phonon renormalization,resulted from change in vibrational assignment excited by polarization *** is evidenced by a direct change of bond energy and bond length in 75/25P(VDF-Tr FE)nanofibers from Raman characterization under polarization electric *** experimental results provide further intuitive evidences that the size of ferroelectric polymers could directly affect the ferroelectricity from the size-dependent thermal transport measurement.

关键词： fibers ferroelectric polarization

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Thermal transport in organic/inorganic composites

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Frontiers in Energy 2018年第1期12卷 72-86页

作者： Bin LIU Lan DONG Qing Xi xiangfan xu Jun ZHOU Baowen LI Center for Phononics and Thermal Energy Science China-EU JointCenter for Nanophononics Shanghai Key Laboratory of SpecialArtificial Microstructure Materials and Technology School of PhysicsScience and Engineering Tongji University Shanghai 200092 China Department of Mechanical Engineering University of ColoradoBoulder CO 80309 USA

Composite materials, which consist of organic and inorganic components, are widely used in various fields because of their excellent mechanical properties, resistance to corrosion, low-cost fabrication, etc. Thermal properties of organic/inorganic composites play a crucial role in some applications such as thermal interface materials for micro-electronic packaging, nano-porous materials for sensor development, thermal insulators for aerospace, and high-performance thermoelectric materials for power generation and refrigeration. In the past few years, many studies have been conducted to reveal the physical mechanism of thermal transport in organic/ inorganic composite materials in order to stimulate their practical applications. In this paper, the theoretical and experimental progresses in this field are reviewed. Besides, main factors affecting the thermal conductivity of organic/ inorganic compositcs are discussed, including the intrinsic properties of organic matrix and inorganic fillers, topolo- gical structure of composites, loading volume fraction, and the interfacial thermal resistance between fillers and organic matrix.

关键词： thermal conductivity organic/inorganic com-posites effective medium theory thermal percolationtheory interfacial thermal resistance

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Suppressed Thermal Conductivity in Polycrystalline Gold Nanofilm:The Effect of Grain Boundary and Substrate

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Chinese Physics Letters 2021年第2期38卷 78-83页

作者： Lan Dong Xiangshui Wu Yue Hu xiangfan xu Hua Bao University of Michigan-Shanghai Jiao Tong University Joint Institute Shanghai Jiao Tong UniversityShanghai 200240China Center for Phononics and Thermal Energy Science China-EU Joint Center for NanophononicsSchool of Physics Science and EngineeringTongji University200092 Shanghai 200092China

We investigate the electrical conductivity and thermal conductivity of polycrystalline gold nanofilms,with thicknesses ranging from 40.5nm to 115.8 nm,and identify a thickness-dependent electrical conductivity,which can be explained via the Mayadas and Shatzkes(MS)*** the same time,a suppressed thermal conductivity is observed,as compared to that found in the bulk material,together with a weak thickness *** compare the thermal conductivity of suspended and supported gold films,finding that the supporting substrate can effectively suppress the in-plane thermal conductivity of the polycrystalline gold *** results indicate that grain boundary scattering and substrate scattering can affect electron and phonon transport in polycrystalline metallic systems.

关键词： conductivity polycrystalline scattering

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Unprecedently low thermal conductivity of unique tellurium nanoribbons

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Nano Research 2021年第12期14卷 4725-4731页

作者： Xiangshui Wu Qiqi Tao Da Li Qilang Wang Xiaoyan Zhang Huile Jin Jun Li Shun Wang xiangfan xu Center for Phononics and Thermal Energy Science China-EU Joint Center for NanophononicsSchool of Physics Science and EngineeringTongji UniversityShanghai200092China College of Chemistry and Materials Engineering Institute of New Materials and Industrial TechnologiesWenzhou UniversityWenzhou325035China

Tellurene,probably one of the most promising two-dimensional(2D)system in the thermoelectric materials,displays ultra-low thermal ***,a linear thickness-dependent thermal conductivity of unique tellurium nanoribbons in this study reveals that unprecedently low thermal conductivity can be achieved via well-defined nanostructures of low-dimensional tellurium instead of pursuing dimension-reduced 2D *** thinnest tellurium nanoribbon with thickness of 144 nm,the thermal conductivity is only∼1.88±0.22 W·m^(−1)·K^(−1) at room ***’s a dramatic decrease(45%),compared with the well-annealed high-purity bulk *** be more specific,an expected thermal conductivity of tellurium nanoribbons is even lower than that of 2D tellurene,as a result of strong phonon-surface *** have faith in low-dimensional tellurium in which the thermoelectric performance could realize further breakthrough.

关键词： tellurium nanoribbons thickness-dependent thermal conductivity linear relationship phonon-surface scattering

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Scaling behavior of thermal conductivity in single-crystallineα-Fe2O3 nanowires

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Chinese Physics B 2020年第8期29卷 96-101页

作者： Qilang Wang Yunyu Chen Adili Aiyiti Minrui Zheng Nianbei Li xiangfan xu Center for Phononics and Thermal Energy Science China-EU Joint Center for NanophononicsSchool of Physics Science and EngineeringTongji UniversityShanghai 200092China The First Affiliated Hospital of Wenzhou Medical University Wenzhou 325000China Department of Electrical and Computer Engineering Faculty of EngineeringNational University of Singapore4 Engineering Drive 3Singapore 117583 Institute of Systems Science and Department of Physics College of Information Science and EngineeringHuaqiao UniversityXiamen 361021China

Unveiling the thermal transport properties of various one-dimensional(1D)or quasi-1D materials like nanowires,nanotubes,and nanorods is of great importance both theoretically and *** dimension or size dependence of thermal conductivity is crucial in understanding the phonon-phonon interaction in the low-dimensional *** this paper,we experimentally investigate the size-dependent thermal conductivity of individual single crystallineα-Fe2O3 nanowires collaborating the suspended thermal bridge method and the focused electron-beam self-heating technique,with the sample diameter(d)ranging from 180 nm to 661 nm and length(L)changing from 4.84μm to 20.73μ*** empirical relationship for diameter-/length-dependent thermal conductivity is obtained,which shows an approximately linear dependence on the aspect ratio(L/(1+Cd))at T=300 K,where C is a fitting *** is related to the boundary scattering and diameter effect ofα-Fe2O3 nanowires although rigorous calculations are needed to confirm the result.

关键词： thermal conductivity size-dependent boundary scattering nanowire

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Dimensional crossover of heat conduction in amorphous polyimide nanofibers

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National Science Review 2018年第4期5卷 500-506页

作者： Lan Dong Qing Xi Dongsheng Chen Jie Guo Tsuneyoshi Nakayama Yunyun Li Ziqi Liang Jun Zhou xiangfan xu Baowen Li Center for Phononics and Thermal Energy Science School of Physics Science and Engineering Tongji University China-EU Joint Center for Nanophononics School of Physics Science and Engineering Tongji University Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology School of Physics Science and Engineering Tongji University Department of Materials Science Fudan University College of Mathematics and Physics Shanghai University of Electric Power Hokkaido University Department of Mechanical Engineering University of Colorado

The mechanism of thermal conductivity in amorphous polymers, especially polymer fibers, is unclear in comparison with that in inorganic materials. Here, we report the observation of a crossover of heat conduction behavior from three dimensions to quasi-one dimension in polyimide nanofibers at a given temperature. A theoretical model based on the random walk theory has been proposed to quantitatively describe the interplay between the inter-chain hopping and the intra-chain hopping in nanofibers. This model explains well the diameter dependence of thermal conductivity and also speculates on the upper limit of thermal conductivity of amorphous polymers in the quasi-1D limit.

关键词： dimensional crossover thermal conductivity nanofiber

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A Ubiquitous Thermal Conductivity Formula for Liquids, Polymer Glass, and Amorphous Solids

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Chinese Physics Letters 2020年第10期37卷 33-38页

作者： Qing Xi Jinxin Zhong Jixiong He xiangfan xu Tsuneyoshi Nakayama Yuanyuan Wang Jun Liu Jun Zhou Baowen Li Center for Phononics and Thermal Energy Science China-EU Joint Lab for NanophononicsSchool of Physics Science and EngineeringTongji UniversityShanghai 200092China Department of Mechanical and Aerospace Engineering North Carolina State UniversityRaleighNC 27695USA Hokkaido University SapporoHokkaido 060-0826Japan School of Environmental and Materials Engineering Shanghai Polytechnic UniversityShanghai 201209China Paul M Rady Department of Mechanical Engineering Department of PhysicsUniversity of ColoradoBoulderCO 80305-0427USA School of Physics and Technology Nanjing Normal UniversityNanjing 210046China

The microscopic mechanism of thermal transport in liquids and amorphous solids has been an outstanding problem for a long *** have been several approaches to explain the thermal conductivities in these systems,for example,Bridgman's formula for simple liquids,the concept of the minimum thermal conductivity for amorphous solids,and the thermal resistance network model for amorphous ***,we present a ubiquitous formula to calculate the thermal conductivities of liquids and amorphous solids in a unified way,and compare it with previous *** calculated thermal conductivities using this formula without fitting parameters are in excellent agreement with the experimental *** formula not only provides a detailed microscopic mechanism of heat transfer in these systems,but also resolves the discrepancies between existing formulae and experimental data.

关键词： resistance amorphous solids

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An innovative way of etching MoS2： Characterization and mechanistic investigation

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Nano Research 2013年第3期6卷 200-207页

作者： Yuan Huang Jing Wu xiangfan xu Yuda Ho Guangxin Ni Qiang Zou Gavin Kok Wai Koon Weijie Zhao A. H. Castro Neto Goki Eda Chengmin Shen Barbaros Ozyilmaz Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China Department of Physics 2 Science Drive 3 National University of Singapore 117542 Singapore Graphene Research Centre 6 Science Drive 2 National University ofSingapore 117542 Singapore Department of Chemistry National University of Singapore 6 Science Drive 2 117546 Singapore Nanocore 4 Engineering Drive 3 National University of Singapore 117576 Singapore NUS GraduateSchoolforlntegrativeSciences andEngineefing (NGS) Centre forLifeSciences (CeLS) 28MedicalDrive 117456 Singapore

We report a systematic study of the etching of MoSs crystals by using XeF2 as a gaseous reactant. By controlling the etching process, monolayer MoS2 with uniform morphology can be obtained. The Raman and photoluminescence spectra of the resulting material were similar to those of exfoliated MoS2. Utilizing this strategy, different patterns such as a Hall bar structure and a hexagonal array can be realized. Furthermore, the etching mechanism was studied by introducing graphene as an etching mask. We believe our technique opens an easy and controllable way of etching MoS2, which can be used to fabricate complex nanostructures, such as nanoribbons, quantum dots, and transistor structures. This etching process using XeF2 can also be extended to other interesting two-dimensional crystals.

关键词： MoS2 etching XeF2 graphene photoluminescence hexagonal

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变换热学与热能调控

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光电工程 2017年第1期44卷 64-68页

作者：徐象繁李保文同济大学物理科学与工程学院声子学与热能科学中心上海200092 同济大学物理科学与工程学院中欧纳米声子学联合实验室上海200092

如果热流大小和热流流向能像固体中的电流一样被调控,则将使热能调控拥有更广阔的应用前景。宏观热能调控最重要的手段是构建热功能材料,通过对宏观热扩散方程的空间变换,实现空间热导系统的非均匀分布,从而有效调控热流流向。这类基于... 详细信息

如果热流大小和热流流向能像固体中的电流一样被调控,则将使热能调控拥有更广阔的应用前景。宏观热能调控最重要的手段是构建热功能材料,通过对宏观热扩散方程的空间变换,实现空间热导系统的非均匀分布,从而有效调控热流流向。这类基于变换热学的新型热功能材料可以实现热隐身与热伪装。

关键词：热能调控变换热学热隐身热伪装

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