MXenes公司
声子
热导率
材料科学
凝聚态物理
热电材料
散射
声子散射
兴奋剂
化学物理
纳米技术
化学
复合材料
光电子学
物理
量子力学
作者
Prince Sharma,Prashant Singh,Ganesh Balasubramanian
出处
期刊:Carbon
[Elsevier]
日期:2024-04-01
卷期号:223: 119015-119015
标识
DOI:10.1016/j.carbon.2024.119015
摘要
Designing materials with low thermal conductivity is a crucial objective for applications in thermal insulation and thermoelectrics. Traditional methods such as doping, mechanical strain and introducing defects in perfect crystals have been widely explored to impede the flow of heat. This work introduces dimensional constriction and cationic disorder as novel avenues to manipulate lattice thermal conductivity (LTC). High entropy materials characterized by random distribution of multiple elements, creates a suitable environment for thermal insulation due to its configurational disorder and local lattice distortions. On the other hand, MXenes, derived from MAX-phase, have garnered considerable attention due to their unique structural attributes, leading to potential applications in catalysis and energy storage. Ti2AlC MAX-phase is examined to understand the impact of dimensional constriction on phonon transport of Ti2C with cationic disorder, i.e., (Ti0.25Nb0.25Cr0.25Ta0.25)2C. The exponential reduction in LTC of HE-MXene is attributed to disorder scattering that significantly limits phonon mean free path (MFP) and relaxation time. The spread of mode-resolved LTC with MFP highlights the influence of disorder on phonon scattering. This work provides a systematic approach to engineer LTC through dimensional constriction and cationic disorder, laying the foundation for tailored materials with desired thermal properties.
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