Mechanically exfoliated MoS_(2) nanoflakes for optimizing the thermoelectric performance of SrTiO_(3)-based ceramic composites
作者机构：State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsInstitute of Functional MaterialsCollege of Materials Science and EngineeringDonghua UniversityShanghai201620China
出 版 物：《Journal of Materiomics》 (无机材料学学报（英文）)
年 卷 期：2022年第8卷第4期
页 面：790-798页
核心收录：
学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学]
基 金：This work was funded by Natural Science Foundation of Shanghai(No.21 ZR 1400300) Natural Science Foundation of China(No.52174343 and 52122203)
主 题：Thermoelectric MoS_(2) SrTiO_(3) Energy scattering Interfacial thermal resistance
摘 要：As a semiconducting material with relatively low thermal conductivity,MoS_(2) nanoflake has the potential to serve as a modulator for optimizing the performance of thermoelectric(TE)***,the low yield of MoS_(2) nanoflakes prepared by conventional methods has constrained the development of MoS_(2) optimized TE *** propose a mechanical exfoliation method for mass production of MoS_(2) nanoflakes using attrition *** mixed with La and Nb co-doped SrTiO_(3)(SLNT)powder,the MoS_(2)/SLNT composites are fabricated by spark plasma *** is found that the heterojunctions formed at MoS_(2)/SLNT interfaces with proper band offset can effectively scatter the low-energy electrons,resulting in enhanced Seebeck coefficient without significantly undermining the electrical *** power factor of composites is improved when the MoS_(2) content is lower than 1.5 vol%.Meanwhile,the thermal conductivity of composites is significantly decreased due to the phonon scattering induced large thermal resistance at MoS_(2)/SLNT interfaces,which is much higher than that in graphene embedded SrTiO_(3) ***,a maximum ZT-0.24 is obtained at 800 K in 1.5 vol%MoS_(2)/SLNT composite,which is~26%higher compared with pristine *** work paves the way for application of TE materials modulated by transition metal dichalcogenides.
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