Thermal conductivity measurement techniques for materials with nanoscale dimensions require fabrication of very complicated devices or their applicability is limited to a class of materials. Discovery of new methods with high thermal sensitivity are required for the widespread use of thermal conductivity measurements in characterizing materials properties. We propose and demonstrate a simple non-destructive method with superior thermal sensitivity to measure the in-plane thermal conductivity of nanosheets and nanowires using the bolometric effect. The method utilizes laser beam heating to create a temperature gradient, as small as a fraction of a Kelvin, over the suspended section of the nanomaterial with electrical contacts. Local temperature rise due to the laser irradiation alters the electrical resistance of the device, which can be measured precisely. This resistance change is then used to extract the temperature profile along the nanomaterial using thermal conductivity as a fitting parameter. We measured the thermal conductivity of V2O3 nanosheets to validate the applicability of the method and found an excellent agreement with the literature. Further, we measured the thermal conductivity of metallic 2H-TaS2 for the first time and performed ab initio calculations to support our measurements. Finally, we discussed the applicability of the method on semiconducting nanosheets and performed measurements on WS2 and MoS2 thin flakes.
VO2 nanosheets: controlling the THz properties through strain engineering
我们研究了应变工程二氧化钒纳米片通过外延生长在（100）R TiO 2衬底上的远红外性能。纳米片表现出大的单轴应变，导致沿金红石c轴的高度均匀和定向的裂纹。戏剧性的各向异性出现的金属-绝缘体转变温度，这是从沿cR轴的结构转变温度不同，和金属态电导率。详细的分析揭示了Mott-Hubbard沿金红石cR轴的行为。
High Performance n- and p-Type Field-Effect Transistors Based on Hybridly Surface-Passivated Colloidal PbS Nanosheets
胶体合成的纳米材料是未来电子器件的有希望的候选材料之一，因为它们的简单性和生产成本低廉。具体而言，胶体纳米片是非常感兴趣的，因为它们可以方便地通过胶体方法生产，同时具有二维的优点。为了采用这些材料，相应的晶体管行为应该是可调节的并且具有高性能。我们表明，胶体硫化铅纳米片的晶体管性能是可调的，通过改变表面钝化，接触金属，或通过将它们暴露在空气中。我们发现，添加卤素离子的合成导致改善的导电性，场效应迁移率，和这些晶体管的开/关比通过钝化它们的表面缺陷。获得了优异的n型特性，场效应迁移率为248 cm ^2 V ^-1 s ^-1，开/关比为4 × 10^6。通过改变接触金属和向工作环境中添加氧气，这些条带的导电性可以从n型变为p型。作为后摩尔时代的可能解决方案，实现胶体材料等新型高质量半导体至关重要。在这方面，我们的研究结果可以提供新的见解，有助于加速其优化潜在的应用。
Outstandingly high thermal conductivity, elastic modulus, carrier mobility and piezoelectricity in two-dimensional semiconducting CrC2N4: A first-principles study
Exceptional piezoelectricity, high thermal conductivity and stiffness and promising photocatalysis in two-dimensional MoSi2N4 family confirmed by first-principles
Molybdenum Disulfide Bilayers Hybridized with Reduced Graphene Oxide Nanosheets for Enhanced Hydrogen Evolution Reaction
Ilum School of Science, Brazilian Center for Research in Energy and Materials（伊卢理学院，巴西能源与材料研究中心）；Institute of Physics “Gleb Wataghin”, University of Campinas（坎皮纳斯大学格莱布·瓦塔金物理研究所）；Brazilian National Nanotechnology Laboratory, Brazilian Center for Research in Energy and Materials（巴西国家纳米技术实验室，巴西能源与材料研究中心）；Postgraduate Program in Nanosciences and Advanced Materials. Federal University of ABC（ABC联邦大学纳米科学与高级材料研究生项目）；Institute of Chemistry, University of Campinas（坎皮纳斯大学化学研究所）
Effect of graphene and carbon-nitride nanofillers on the thermal transport properties of polymer nanocomposites: A combined molecular dynamics and finite element study
Thermal conductivity measurements of PTFE and Al$_2$O$_3$ ceramic at sub-Kelvin temperatures
用于稀有事件搜索的低温测辐射热探测器的设计需要根据其热性能仔细选择和表征结构材料。测量了聚四氟乙烯（PTFE）和Al $_2$ O $_3$陶瓷（氧化铝）在0.17-0.43 K和0.1-1.3 K温度范围内的热导率。对于前者，我们在整个测量范围内观察到二次温度依赖性。对于后者，我们看到温度高于~0.3 K的立方依赖性，低于该温度的线性贡献。本文介绍了我们的测量技术，结果和理论讨论。关键词：导热系数，PTFE，Al $_2$ O $_3$陶瓷，测辐射热计
