【摘 要】
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The printed electronics technology can be used to efficiently construct smart devices and is dependent on functional inks containing well-dispersed active materials.Two-dimensional (2D) materials are promising functional ink candidates due to their superi
【机 构】
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Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan 43
论文部分内容阅读
The printed electronics technology can be used to efficiently construct smart devices and is dependent on functional inks containing well-dispersed active materials.Two-dimensional (2D) materials are promising functional ink candidates due to their superior properties.However,the majority 2D materials can disperse well only in organic solvents or in surfactant-assisted water solutions,which limits their applications.Herein,we report a lithium (Li)-ion exchange method to improve the dispersity of the Na2W4O13 nanosheets in pure water.The Li-ion-exchanged Na2W4O13 (LixNa2-xW4O13) nanosheets show highly stable dispersity in water with a zeta potential of-55 mV.Moreover,this aqueous ink can be sprayed on various substrates to obtain a uniform LixNa2-xW4O13 nanosheet film,exhibiting an excellent electrochromic performance.A complementary electrochromic device containing a LixNa2-xW4O13 nanosheet film as an electrochromic layer and Prussian white (PW) as an ion storage layer exhibits a large optical modulation of 75％ at 700 nm,a fast switching response of less than 2 s,and outstanding cyclic stability.This Na2W4O13-based aqu-eous ink exhibits considerable potential for fabricating large-scale and flexible electrochromic devices,which would meet the practical application requirements.
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