title: An electrochromic composite film of Preyssler-type phosphotungstate decorated by AuNPs.
abstract: A multilayer composite film containing Preyssler-type phosphotungstate K12.5Nal.5[NaP5W30O110]·l5H2O (P5W30) and Au particles (AuNPs) was fabricated by layer-by-layer assembly technology (LBL). The {[PEI/PSS-AuNPs/PEI/P5W30]n} composite film was characterized by scanning electronic microscopic (SEM), UV-vis spectroscopy, X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and cyclic voltammetry (CV) measurements. The electrochemical behavior of the films with and without AuNPs was investigated by cyclic voltammetry and electrochemical impedance spectra, and the composite film showed an enhanced electron transfer rate. The 6 bilayer AuNPs-free film performed color switching from transparent to blue, optical contrast of 10.4%, and an coloration efficiency of 6.99 cm(2) C(-1) at 600 nm. The 6 bilayer composite film displayed enhanced electrochromic performance with the color switching from claret-red to deeper purple, optical contrast of 27.3% and coloration efficiency of 18.52 cm(2) C(-1) at 550 nm due to the presence of AuNPs. The contribution of AuNPs gives valuable information for exploring new electrochromic materials.
authors.affiliation: Key Laboratory of Green Chemical Engineering and Technology of College of Heilongjiang Province, College of Chemical and Environmental Engineering, Harbin University of Science and Technology, Harbin 150040, China. ningli.candy@163.com
authors.forename: Li
authors.initials: L
authors.lastname: Ning
authors.forename: Wenjie
authors.initials: W
authors.lastname: Zhang
authors.forename: Hong
authors.initials: H
authors.lastname: Yan
authors.forename: Haijun
authors.initials: H
authors.lastname: Pang
authors.forename: Huiyuan
authors.initials: H
authors.lastname: Ma
authors.forename: Yan
authors.initials: Y
authors.lastname: Yu