Lan Haihui, Wang Luyang, Li Yilin, Deng Shugang, Yue Yanan, Zhang Tianzhu, Zhang Shunping, Zeng Mengqi, Fu Lei
College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China.
School of Power and Mechanical Engineering, Wuhan University, Wuhan, 430072, China.
Small. 2022 Oct;18(41):e2204595. doi: 10.1002/smll.202204595. Epub 2022 Sep 11.
Ultralow thermal conductivity materials have triggered much interest due to diverse applications in thermal insulation, thermal barrier coating, and especially thermoelectrics. Two dimensional (2D) indium tellurides with ultralow thermal conductivity provide a versatile platform for tailoring the heat transfer, exploring new candidates for thermoelectrics, and achieving miniature, lightweight, and highly integrated devices. Unfortunately, their nanostructure and structure-related heat transfer properties at a 2D scale are much less studied due to difficulties in material fabrication. The ionic character between interlayers and strong covalent bonds in 3D directions impede the anisotropic growth of indium telluride flakes; meanwhile, the low environmental stability and chemical reactivity of tellurium also limit the fabrication of high-quality tellurides, thus hindering the exploration of thermal transport properties. Here, a self-modulation-guided growth strategy to synthesize high-quality 2D In Te single crystals with ultralow thermal conductivity (0.47 W m K ) is developed. This strategy can also be extended to synthesize a series of highly crystallized metal tellurides, providing excellent candidates for further application in thermoelectrics.
超低热导率材料因其在隔热、热障涂层，尤其是热电领域的多样应用而引发了广泛关注。具有超低热导率的二维（2D）铟碲化物为调控热传递、探索新型热电材料以及实现微型、轻质和高度集成的器件提供了一个通用平台。不幸的是，由于材料制备困难，它们在二维尺度上的纳米结构和与结构相关的热传递特性的研究要少得多。层间的离子特性和三维方向上的强共价键阻碍了铟碲化物薄片的各向异性生长；同时，碲的低环境稳定性和化学反应性也限制了高质量碲化物的制备，从而阻碍了对热输运性质的探索。在此，开发了一种自调制引导生长策略，以合成具有超低热导率（0.47 W m⁻¹ K⁻¹）的高质量二维In₂Te₃单晶。该策略还可扩展用于合成一系列高度结晶的金属碲化物，为热电领域的进一步应用提供了优异的候选材料。
