Magnetocaloric effects in a freestanding and flexible graphene-based superlattice synthesized with a spatially confined reaction

Haiou Zhu, Chong Xiao, Hao Cheng, Fabian Grote, Xiaodong Zhang, Tao Yao, Zhou Li, Chengming Wang, Shiqiang Wei (), Yong Lei and Yi Xie ()
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Haiou Zhu: Hefei National Laboratory for Physical Sciences at the Microscale, and Collaborative Innovation Center of Chemistry for Energy Materials, University of Science & Technology of China
Chong Xiao: Hefei National Laboratory for Physical Sciences at the Microscale, and Collaborative Innovation Center of Chemistry for Energy Materials, University of Science & Technology of China
Hao Cheng: National Synchrotron Radiation Laboratory, University of Science & Technology of China
Fabian Grote: Institute of Physics and IMN MacroNano® (ZIK), Ilmenau University of Technology
Xiaodong Zhang: Hefei National Laboratory for Physical Sciences at the Microscale, and Collaborative Innovation Center of Chemistry for Energy Materials, University of Science & Technology of China
Tao Yao: National Synchrotron Radiation Laboratory, University of Science & Technology of China
Zhou Li: Hefei National Laboratory for Physical Sciences at the Microscale, and Collaborative Innovation Center of Chemistry for Energy Materials, University of Science & Technology of China
Chengming Wang: Hefei National Laboratory for Physical Sciences at the Microscale, and Collaborative Innovation Center of Chemistry for Energy Materials, University of Science & Technology of China
Shiqiang Wei: National Synchrotron Radiation Laboratory, University of Science & Technology of China
Yong Lei: Institute of Physics and IMN MacroNano® (ZIK), Ilmenau University of Technology
Yi Xie: Hefei National Laboratory for Physical Sciences at the Microscale, and Collaborative Innovation Center of Chemistry for Energy Materials, University of Science & Technology of China

Nature Communications, 2014, vol. 5, issue 1, 1-8

Abstract: Abstract Superlattices have attracted great interest because of their tailorable electronic properties at the interface. However, the lack of an efficient and low-cost synthetic method represents a huge challenge to implement superlattices into practical applications. Herein, we report a space-confined nanoreactor strategy to synthesize flexible freestanding graphene-based superlattice nanosheets, which consist of alternately intercalated monolayered metal-oxide frameworks and graphene. Taking vanadium oxide as an example, clear-cut evidences in extended X-ray absorption fine structure, high-resolution transmission electron microscopy and infrared spectra have confirmed that the vanadium oxide frameworks in the superlattice nanosheets show high symmetry derived from the space-confinement and electron-donor effect of graphene layers, which enable the superlattice nanosheets to show emerging magnetocaloric effect. Undoubtedly, this freestanding and flexible superlattice synthesized from a low-cost and scalable method avoids complex transferring processes from growth substrates for final applications and thus should be beneficial to a wide variety of functionalized devices.

Date: 2014
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DOI: 10.1038/ncomms4960

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