title: Magnetocaloric effects in a freestanding and flexible graphene-based superlattice synthesized with a spatially confined reaction.
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.
authors.affiliation: Hefei National Laboratory for Physical Sciences at the Microscale, and Collaborative Innovation Center of Chemistry for Energy Materials, University of Science & Technology of China, Hefei, Anhui 230026, China.
authors.forename: Haiou
authors.initials: H
authors.lastname: Zhu
authors.affiliation: Hefei National Laboratory for Physical Sciences at the Microscale, and Collaborative Innovation Center of Chemistry for Energy Materials, University of Science & Technology of China, Hefei, Anhui 230026, China.
authors.forename: Chong
authors.initials: C
authors.lastname: Xiao
authors.affiliation: National Synchrotron Radiation Laboratory, University of Science & Technology of China, Hefei, Anhui 230029, China.
authors.forename: Hao
authors.initials: H
authors.lastname: Cheng
authors.affiliation: Institute of Physics and IMN MacroNano® (ZIK), Ilmenau University of Technology, 98693 Ilmenau, Germany.
authors.forename: Fabian
authors.initials: F
authors.lastname: Grote
authors.affiliation: Hefei National Laboratory for Physical Sciences at the Microscale, and Collaborative Innovation Center of Chemistry for Energy Materials, University of Science & Technology of China, Hefei, Anhui 230026, China.
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Zhang
authors.affiliation: National Synchrotron Radiation Laboratory, University of Science & Technology of China, Hefei, Anhui 230029, China.
authors.forename: Tao
authors.initials: T
authors.lastname: Yao
authors.affiliation: Hefei National Laboratory for Physical Sciences at the Microscale, and Collaborative Innovation Center of Chemistry for Energy Materials, University of Science & Technology of China, Hefei, Anhui 230026, China.
authors.forename: Zhou
authors.initials: Z
authors.lastname: Li
authors.affiliation: Hefei National Laboratory for Physical Sciences at the Microscale, and Collaborative Innovation Center of Chemistry for Energy Materials, University of Science & Technology of China, Hefei, Anhui 230026, China.
authors.forename: Chengming
authors.initials: C
authors.lastname: Wang
authors.affiliation: National Synchrotron Radiation Laboratory, University of Science & Technology of China, Hefei, Anhui 230029, China.
authors.forename: Shiqiang
authors.initials: S
authors.lastname: Wei
authors.affiliation: Institute of Physics and IMN MacroNano® (ZIK), Ilmenau University of Technology, 98693 Ilmenau, Germany.
authors.forename: Yong
authors.initials: Y
authors.lastname: Lei
authors.affiliation: Hefei National Laboratory for Physical Sciences at the Microscale, and Collaborative Innovation Center of Chemistry for Energy Materials, University of Science & Technology of China, Hefei, Anhui 230026, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Xie