Journal
CERAMICS INTERNATIONAL
Volume 46, Issue 11, Pages 17992-18001Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2020.04.114
Keywords
Dielectric; Breakdown; Nanocomposite; Quantum; Coulomb
Categories
Funding
- National Natural Science Foundation of China [51502309]
- Science and Technology Research Program of Chongqing Municipal Education Commission [KJQN201901417]
- Chongqing Basic Research and Frontier Exploration Project [cstc2019jcyj-msxmX0518]
- Support Programme for Growth of Young Scientific Research Talents of Yangtze Normal University [0107/010721064]
- Talent Introduction Scientific Research Initiation Projects of Yangtze Normal University [2017KYQD33]
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Graphene nanosheets are widely employed for fabricating high-dielectric-constant polymer nanocomposites for energy storage. However, severely reduced electric breakdown strengths of composites with increasing graphene content limit their high-field applications. To improve breakdown strengths of polyvinylidene fluoride/graphene composites without sacrificing dielectric constants, in this work, we proposed a rational strategy of constructing MXene quantum dot inter-layers for preparing ternary composites with desirable electric properties, owing to inter-layer induced quantum confinement and Coulomb blockade effects. Graphene oxide@nitrogen-doped Ti3C2 MXene quantum-dot hybrid nanoparticles were synthesized via hydrogen-bond induced self-assembly route. Binary polymer/graphene and ternary polymer/hybrid-particle nanocomposite films were fabricated by solution cast process. Compared with binary composites, ternary counterparts have synergistically improved dielectric constants and breakdown strengths. Repeated disorder-bounce of electrons and strong coupling between electrons and holes, inside each quantum dot, might be responsible for superior electric performances of ternary composites. High dielectric constant (similar to 53@1 kHz) and breakdown strength (similar to 205 MV m(-1)) were realized in ternary composite with 0.12 wt % of nanoparticles. This work might pave a road for large-scale fabrication of high-performance nanocomposite dielectrics for energy storage.
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