Widely Adjustable and Quasi-Reversible Electrochromic Device Based on Core-Shell Au-Ag Plasmonic Nanoparticles

Plasmonic effects in Au-Ag nanostructures are utilized to realize novel electrochromic device. A quasi ordered Au-Ag core-shell nanoparticle array is realized by thermal evaporation of Au and electrochemical deposition of Ag into a SiO2 hole array assisted by anodic aluminium oxide membranes. The thickness of the Ag shell could be changed by alternating the electrochemical deposition time: as a result, the color of the device can be widely and quasi-reversibly tuned through this electrical control.