Electrochromic properties of sol-gel derived WO3 coatings

Technical Report · Sun Mar 01 04:00:00 EST 1992

OSTI ID:5003430

Judeinstein, P; Livage, J

Amorphous tungsten oxide layers are deposited via the sol-gel route. Aqueous solutions of tungstate salts (Na2WO4) or chloroalkoxides (WOC12(OPri)2) provide cheap and suitable precursors for the synthesis of W03, nH20 colloidal solutions. Layers of large area can be deposited by spray or dip-coating. They exhibit electrochromic properties and could be used for making display devices or smart windows. Their electrochromic properties depend on the structure of the oxide network and the amount of water of the W03, nH20 layers. Switching time and stability decrease when n increases due to faster ion diffusion. Optical absorption arising from electron delocalization varies with the crystalline structure of the oxide network. Both the structure and the hydration state of the layers depend on the experimental procedure. It is therefore possible to optimize the electrochromic properties of sol-gel derived layers.

• Research Organization: Paris-6 Univ. (France). Lab. de Chimie de la Matiere Condensee
• OSTI ID: 5003430
• Report Number(s): AD-P-006439/4/XAB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
ABSORPTION
AMORPHOUS STATE
CHALCOGENIDES
CHARGED PARTICLES
DEPOSITION
DIFFUSION
DIP COATING
ELECTRO-OPTICAL EFFECTS
ELECTROCHROMISM
HYDRATION
IONS
LAYERS
OPENINGS
OXIDES
OXYGEN COMPOUNDS
REFRACTORY METAL COMPOUNDS
SOL-GEL PROCESS
SOLVATION
SORPTION
SPRAYS
STABILITY
SURFACE COATING
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
TUNGSTATES
TUNGSTEN COMPOUNDS
TUNGSTEN OXIDES
USES
WINDOWS