Bhattacharjee, Saheli and Paul, Sumana and Thapa, Ranjit and Kundu, Susmita (2026) Orientation-Selective and Vacancy-Engineered PANI-V2O5 Nanocomposites for Ultrafast High Contrast Quadri Colored Electrochromism. Materials Today Nano, 35 (100865). ISSN 2588-8420

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Abstract

PANI-V2O5 nanocomposite is a promising electrochemical platform due to rich multi-redox activity of both the constituents. However, prior studies have largely focused on PANI-mediated pillaring of the V2O5 (001) plane, leaving the electrochromic potential of non-basal planes unexplored. This study reports strategic synthesis of 5-20 wt% PANI loaded V2O5, that induces pronounced preferential growth along the V2O5 (110) plane, and oxygen vacancy engineering leading to markedly enhanced electrochromic performance. An optimized 10 wt% PANI composition delivered ultrafast switching (tb = 0.03 ± 0.005 s; tc = 0.04 ± 0.005 s), while 15 wt% PANI enabled four highly reversible color states (yellow → green → brown → orange) with an exceptional optical modulation of 83.9% at ∼ 400 nm. Density Functional Theory (DFT) revealed that PANI-induced oxygen vacancies restructured the electronic and ionic landscape by generating mid-gap states, increasing carrier density, and lowering Li+ diffusion barriers. Projected density of states, corroborated by Raman and FTIR analyses, confirmed strong hybridization between PANI π-orbitals and V dxy states, enabling efficient interfacial charge transfer. This synergistic coupling yields rapid, quadri-colored, high-contrast electrochromism, advancing towards next-generation tunable optoelectronic devices. Keywords: PANI loaded V2O5; Orientation selective; Oxygen vacancy engineering; Ultrafast color switching; High optical modulation; Quadri colored electrochromism

Item Type:	Article
Uncontrolled Keywords:	PANI loaded V2O5; Orientation selective; Oxygen vacancy engineering; Ultrafast color switching; High optical modulation; Quadri colored electrochromism
Subjects:	Microstructure and Characterization Crystal Chemistry, Thermodynamics, Phase Equilibria
Divisions:	Sensor and Actuator
Depositing User:	Ms Upasana Sahu
Date Deposited:	22 Sep 2026 06:57
Last Modified:	22 Sep 2026 06:57
URI:	https://cgcri.csircentral.net/id/eprint/5828

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