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Nano energy v.31, 2017년, pp.144 - 151   SCIE
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Free-standing SWNTs/VO2/Mica hierarchical films for high-performance thermochromic devices

Chen, Yuliang (Corresponding authors. ); Fan, Lele (Corresponding authors. ); Fang, Qi ( ); Xu, Weiyu ( ); Chen, Shi ( ); Zan, Guibin ( ); Ren, Hui ( ); Song, Li ( ); Zou, Chongwen ( );
  • 초록  

    Abstract Vanadium dioxide (VO 2 ) with reversible metal-insulator transition (MIT) is a promising energy-saving material for next-generation smart windows and infrared devices. However, the specific applications are largely limited by the relatively high critical temperature as well as the non-transferable grown-substrate. Herein, we report such limitations can be overcome by directly growing VO 2 on layered mica sheets and integrating with high transparent single-walled carbon nanotube (SWNT) films. The SWNTs/VO 2 /mica hierarchical films can be peeled-off to form a free-standing ultra-thin optical window and can further be transferred to other substrates with high flexibility and transparency. By heating the SWNTs/VO 2 layer with a bias current, the MIT process of VO 2 film can be facilely modulated, achieving the reversible and dynamical regulation of the infrared transmission. Furthermore, by adjusting the bias current, it is possible to change the starting local temperature and shift the initial situation close to the “phase transition boundary”, resulting in the decreased energy barrier to trigger the MIT behavior. This fascinating strategy overcomes the high critical temperature limit of VO 2 and avoids the bottle-neck problem in practical applications of VO 2 material, which demonstrates wide applications of this kind of device in the future. Highlights The wafer-size free-standing SWNTs/VO 2 /Mica hierarchical film were prepared. The infraredtransmission of the film was facilely modulated by external voltage. The energy barrier to trigger MITwas decreasedfor practical applications. Graphical abstract [DISPLAY OMISSION]


  • 주제어

    Vanadium dioxide .   Phase transition .   Optical switching .   Energy-saving material.  

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