One-step inkjet printing of tungsten oxide-poly(3,4-ethylenedioxythiophene):polystyrene sulphonate hybrid film and its applications in electrochromic devices

• Published in: Thin solid films Vol. 603; pp. 276 - 282
• Main Authors: Nguyen, Thi-Thuy-Nga, Chan, Chih-Yu, He, Ju-Liang
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 31.03.2016
• Subjects: Electrochromic devices; Inkjet printing; Poly(3,4-ethylenedioxythiophene):polystyrene sulphonate; Tungsten oxide; Wet ball-milling; Tungsten oxide; Electrochromic devices; Inkjet printing; Poly(3,4-ethylenedioxythiophene):polystyrene sulphonate; Wet ball-milling
• ISSN: 0040-6090; 1879-2731
• DOI: 10.1016/j.tsf.2016.02.031

Hybrid film comprised tungsten oxide and poly (3,4-ethylenedioxythiophene):polystyrene sulphonate (WO3–PEDOT:PSS) was developed by applying one-step inkjet printing from an office inkjet printer. The WO3 nanoparticles were synthesized from commercial crystalline WO3 powder through a wet ball-milling process, which is a simple, environmentally friendly, and cost-effective method of using water as a green solvent and low-energy milling. The WO3–PEDOT:PSS inkjet ink was prepared by dispersing the as-milled WO3 and PEDOT:PSS in n-propanol and deionized water. The inkjet-printed WO3–PEDOT:PSS thin films show marked improvements of cathodic electrochromism over WO3 films: the transmittance change of 20% at 550nm (visible region) and 35% at 900nm (infrared region) along with the response time of 5.67/0.30s in their colored/bleached state, and the electrochromic coloration efficiency of 27.86cm2/C at 550nm and 69.64cm2/C at 900nm. •WO3 nanoparticles were synthesized by milling commercial crystalline WO3.•Wet ball-milling was carried out by using water as a green solvent and low energy.•WO3–PEDOT:PSS hybrid ink was simply prepared by adding n-propanol and DI water.•WO3–PEDOT:PSS hybrid films were inkjet-printed via an office inkjet printer.•WO3–PEDOT:PSS films show better electrochromic performances than WO3 films.