In-situ growth of carbon nanotubes on ZnO to enhance thermoelectric and mechanical properties
作者机构：State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsCollege of Materials Science and EngineeringDonghua UniversityShanghai 201620China Engineering Research Center of Advanced Glasses Manufacturing TechnologyMinistry of EducationDonghua UniversityShanghai 201620China Institute of Functional MaterialsDonghua UniversityShanghai 201620China School of Engineering and Materials ScienceQueen Mary University of LondonLondon E14NSUK
出 版 物：《Journal of Advanced Ceramics》 (先进陶瓷（英文）)
年 卷 期：2022年第11卷第12期
页 面：1932-1943页
核心收录：
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 by the National Natural Science Foundation of China(51871053,91963204,and 52174343) Fundamental Research Funds for the Central Universities(2232020A-02) Science and Technology Commission of Shanghai Municipality(Shanghai Administration of Foreign Experts Affairs)(20JC1415200)
主 题：ZnO carbon nanotubes(CNTs) in-situ grown thermoelectric(TE) mechanical properties
摘 要：As a high-temperature thermoelectric(TE)material,ZnO offers advantages of non-toxicity,chemical stability,and oxidation resistance,and shows considerable promise as a true ready-to-use module under air ***,poor electrical conductivity and high thermal conductivity severely hinder its *** nanotubes(CNTs)are often used as a reinforcing phase in composites,but it is difficult to achieve uniform dispersion of CNTs due to van der Waals ***,we developed an effective in-situ growth strategy of homogeneous CNTs on ZnO nanoparticles by exploiting the chemical vapor deposition(CVD)technology,in order to improve their electrical conductivity and mechanical properties,as well as reducing the thermal ***,magnetic nickel(Ni)nanoparticles are introduced as catalysts for promoting the formation of CNTs,which can also enhance the electrical and thermal transportation of ZnO ***,the electrical conductivity of ZnO is significantly boosted from 26 to 79 S·cm^(−1) due to the formation of dense and uniform conductive CNT *** lattice thermal conductivity(κ_(L))is obviously declined by the intensification of phonon scattering,resulting from the abundant grain boundaries and interfaces in ZnO-CNT ***,the maximum dimensionless figure of merit(zT)of 0.04 at 800 K is obtained in 2.0%Ni-CNTs/ZnO,which is three times larger than that of CNTs/ZnO prepared by traditional ultrasonic *** addition,the mechanical properties of composites including Vickers hardness(HV)and fracture toughness(K_(IC))are also *** work provides a valuable reference for dispersing nano-phases in TE materials to enhance both TE and mechanical properties.
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