Electrochromic properties of tetrabutylammonium perchlorate-doped polypyrrole/ nanocellulose composite films
Küçük Resim Yok
Tarih
2025
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier Science Sa
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
This study investigates electrochromic properties of tetrabutylammonium perchlorate (TBAP)-doped polypyrrole (PPy) and PPy/Nanocellulose (NC) composite films, where TBAP-doped PPy/NC composites were synthesized with various NC content ranging from 0 % to 100 % by volume in 0.1 M pyrrole solution and deposited on fluorine-doped tin oxide (FTO) glass using potentiostatic polymerization. The optimum polymerization time for depositing a uniform, adhesive and stable films on FTO with higher optical contrast between bleached and colored states are found to be 10 s at a constant voltage of 1.2 V. To compare the electrochromic properties of NC-free and NC-containing TBAP-doped PPy films, cyclic voltammetry (CV), chronoamperometry (CA), and optical transmittance spectroscopy were carried out in 0.1 M TBAP electrolyte. A reversible color change from yellow at - 0.6 V (bleached state) to blue gray at + 0.6 V (colored state) is observed for %40 NC-containing TBAP-doped PPy composite film. CV measurements at the potential between - 0.8 V and + 0.8 V show an increase at the oxidation and reduction peak currents up to 60 % NC in TBAP-doped PPy, but the highest optical contrast and uniformity is observed for 40 % NC-containing composite film. And scanning electron microscopy images reveal that surface morphology changes and cluster/agglomerations on the surface of the films are formed when the %NC value exceeds 60 %. Of the NC-containing composite films, the 40 % NC-containing TBAPdoped PPy composite film exhibits the best adhesion to FTO substrate. Furthermore, the highest optical contrast (25.9 % at 700 nm) is observed for %40 NC-containing TBAP-doped PPy when compared to NC-free TBAP-doped PPy film (18.7 % at 700 nm). Therefore, PPy/NC composite with 40 % volume ratio of NC in PPy was selected for further CV and CA experiments. Compared to NC-free films, 40 % NC-containing TBAP-doped PPy exhibits faster switching time (1.16 s), higher optical contrast (25.9 % at 700 nm), higher coloration efficiency (65.6 cm2/C), and better uniformity on FTO. Our results may lead to the design of a high-performance electrochromic devices using NC-Conductive Polymers, with electrochromic and mechanical properties that can be adjusted through NC composition, especially to create flexible composites with enhanced mechanical strength.
Açıklama
Anahtar Kelimeler
Polypyrrole, PPy, Cellulose, Nanocellulose, Electropolymerization, Conductive polymers, Electrochromic, Electrochromism
Kaynak
Thin Solid Films
WoS Q Değeri
Q3
Scopus Q Değeri
Q2
Cilt
811
