الفهرس 
CH1 : THEORETICAL CONCEPTSOnly 14 pages are availabe for public view
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Abstract
Hydrated nickel oxide films have been electrochel:nically (cathodically) deposited using urea and nickel sulphate solutions. Tin-doped indium oxide (ITO) coated glass was used as a cathode while the anode was a sheet of platinum. The films were subjected to electrochemical ion insertion/extraction using potassium hydroxide.
In order to optimise the preparation conditions, a series of hydrated nickel oxide films have been electTochemically deposited using electrolytes with different amounts of urea concentrations. The transmittance and
spectrophotometer. The film thickness of the prepared samples was measured using multiple beam Fizeau fringes at reflection
The results showed that:
- Urea concentration is an effective parameter in preparing nickel oxide films, samples prepared at lower urea concentTation (0.25 gm) exhibit a very good electrochromic behaviour.
- Films of large thicknesses (deposition times > 50 min) posses very low durability during the colouring / bleaching cycling.
- It was observed that samples of ] OOnm film thickness showed considerable solar and visible optical modulations (~Ts=0.43, ~Tv=0.56). Therefore,
hydrated nickel oxide sample of 100mn thickness has been subjected to subsequent investigations.