Preparation and electrochromism of alkylammonium molybdate thin films

Abstract An alkylammonium molybdate composite is prepared from (NH 4 ) 6 Mo 7 O 24 · 4H 2 O and n -C 18 H 37 NH 2 and its thin film is fabricated through a spin-on coating technique. Thermogravimetric analysis and elemental analysis results indicate that the main product of the composite is (C 18 H 37 NH 3 ) 5 HMo 7 O 24 . The structure of the composite is laminated according to the X-ray diffraction pattern. The composite thin film exhibits reversible electrochromism. It is found that the composite thin film exhibits better electrochromic behavior in HCl aqueous solution than that in LiClO 4 /propylene carbonate solution.