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Organic Nanostructures on Inorganic Ones: An Efficient Electrochromic Display by Design

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journal contribution
posted on 19.06.2018, 22:04 by Suryakant Mishra, Simran Lambora, Priyanka Yogi, Pankaj R. Sagdeo, Rajesh Kumar
Improved electrochromism has been reported from a hybrid nanoheterostructure-based array designed using transition-metal oxides and conducting polymers. An improvement in color contrast, coloration efficiency, and operating voltage makes these hybrid core–shell-type nanostructures (NSs) suitable for power efficient and reversible electrochromic applications showing switching between transparent and opaque states rather than resulting in colored/bleached switching. Nanopetals (NPs) of nickel oxide have been used as the backbone to grow nanohemispheres (NHs) of polyaniline onto a fluorine-doped tin oxide electrode using a two-step synthesis methodology consisting of a hydrothermal method, followed by an electrodeposition method. The coaxial NPs/NHs core–shell arrays exhibit a better electrochromic performance compared to their individual constituents. Devices fabricated using these hybrid NSs show power efficient optical switching between transparent and opaque with fast response and a good cycle life of approximately 1500. The coloration efficiency of the fabricated device has been calculated to be more than 145 cm2/C and an optical modulation of more than 45%.