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7 results on '"Zheng, Kangyi"'

6. Premelted-Substrate-Promoted Selective Etching Strategy Realizing CVD Growth of High-Quality Graphene on Dielectric Substrates

Author

Yang, Yuyao, Yuan, Hao, Liu, Mengxiong, Cheng, Shuting, Li, Wenjuan, Liang, Fushun, Zheng, Kangyi, Liu, Longfei, Yang, Fan, Liu, Ruojuan, Su, Qingxu, Qi, Yue, and Liu, Zhongfan

Abstract

Direct chemical vapor deposition growth of high-quality graphene on dielectric substrates is a great challenge. Graphene growth on dielectrics always suffers from the issues of a high nucleation density and poor quality. Herein, a premelted-substrate-promoted selective etching (PSE) strategy was proposed. The premelted substrate can promote charge transfer from the substrate to the nuclei near graphene domains, thus facilitating the reaction between the CO2etchant and the nuclei. Consequently, the PSE strategy can realize selective etching of nuclei formed near graphene domains to evolve high-quality graphene with a uniform domain size of ∼1 μm and an ID/IGratio of ∼0.13 on glass fiber, achieving the largest domain size and the lowest defect density in graphene grown on a noncatalytic substrate without metal assistance. The largely improved quality of graphene significantly increases the electrical conductivity by 3 times and improves the working life by 7 times when applied as an electric heater compared with that fabricated without the PSE strategy.

Published
2025
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7. Carbon Nanotubes/Graphene‐Skinned Glass Fiber Fabric with 3D Hierarchical Electrically and Thermally Conductive Network.

Author

Liu, Mengxiong, Yang, Yuyao, Liu, Ruojuan, Wang, Kun, Cheng, Shuting, Yuan, Hao, Huang, Kewen, Liang, Fushun, Yang, Fan, Zheng, Kangyi, Liu, Longfei, Tu, Ce, Wang, Jingnan, Gai, Xuzhao, Qiao, Wang, Wang, Xiaobai, Qi, Yue, and Liu, Zhongfan

Subjects
*GLASS fibers, *THERMAL resistance, *THERMAL conductivity, *CHEMICAL vapor deposition, *ELECTRIC conductivity, *ELECTRON transport
Abstract

Graphene‐skinned fiber fabric is prepared by chemical vapor deposition (CVD) of continuous graphene on fabric, which enables conformal graphene coverage on fibers and inherits high electrical and thermal conductivity of graphene. However, in the fabric‐shaped configuration, high electrical and thermal contact resistances between fibers, and the lack of conductive and thermal pathways along radial direction of fibers limit the improvement of electrical and thermal conductivity. Herein, carbon nanotubes (CNTs), due to the 1D structure with excellent electrical and thermal conductivity, are introduced to build rich “bridges” to connect the isolated fibers to build new electron and phonon transport channels. Thus, the conceptual design of CNT/graphene‐skinned glass fiber fabric (CNT/GGFF) is creatively proposed and realized by a carefully designed CVD. Constructing the 3D electrically and thermally conductive network in CNT/GGFF leads to >90% decrease of sheet resistance, 4.5 times increase of tensile strength, and >70% decrease of thermal resistance compared with GGFF, making it promising for applications in composite materials, heat dissipation, and de‐icing. Moreover, the thermal resistance of CNT/GGFF exhibits temperature‐independent, extending applications to aviation and space because changes in thermal conductivity of traditional materials with environmental temperatures can adversely affect the thermal stability, reliability, and lifetime of aircrafts. [ABSTRACT FROM AUTHOR]

Published
2024
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