Microstructure and thermoelectric properties of nanoparticled copper selenide alloys synthesized using a microwave-assisted hydrothermal method
作者机构：School of PhysicsState Key Laboratory of Crystal MaterialsShandong UniversityJinan 250100China
出 版 物：《ChemPhysMater》 (化学物理材料（英文）)
年 卷 期：2023年第2卷第3期
页 面：207-216页
学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）]
基 金：supported financially by the National Key R&D Pro-gram of China(2017YFE0195200) the Natural Science Fund of China(under grant nos.51871134,52171216,and 52111530034) the Science Fund of Shandong Province(under grant no.ZR2019MEM007) the Qilu Young Scholar Program of Shandong University
主 题：Cu_(2)Se alloys Microwave hydrothermal synthesis Nanoparticles Multiscale microstructure Thermoelectric performance
摘 要：With the fabrication of high-performance thermoelectric(TE)materials,developments are being made in enhanc-ing the figure of merit,zT,of TE ***-like binary copper selenide(Cu_(2) Se)chalcogenides recently gained significant recognition because of their anomalous but fascinating electrical and thermal transport *** this study,a facile synthesis technique was adopted in fabricating Cu_(2) Se nanoparticles using a rapid microwave-assisted hydrothermal route at different reaction *** results were compared with those of the Cu_(2) Se solid-state(SS)sample synthesized using the traditional melting and annealing technique.X-ray diffrac-tion patterns revealed successful synthesis of nanoparticles and a phase transition from orthorhombic𝛼-phase and cubic𝛽-phase to a single orthorhombic structure after *** electron microscopic images revealed that although the grain sizes of the nanoparticle(NP)bulk samples increased with the reaction time of the microwave hydrothermal process,the grain sizes were significantly smaller than that of the SS ***,NP bulk samples exhibited plenty of nano-grains and pores that are absent in the SS *** size and distribution of the grains and pores were measured to study their effects on the transport of carriers and *** NP30 sample exhibited the highest power factor of 983.3μW K−2 m at 673 K among the NP samples,exhibiting intermediate values of resistivity and Seebeck coefficient that are close to those of the SS ***,the NP samples exhibited appreciably lower thermal conductivity than the SS sample that is attributed to strengthened phonon *** minimum thermal conductivity of the NP05 sample,0.78 WK−1 m−1 at 348 K,is 1.7 times lower than that of the SS ***,a maximum zT of 0.56 at 673 K,being approximately 1.3 times higher than that of the SS sample owing to the optimized thermal conductivity,was achieved for the NP30 *** value
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