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In this contribution,polystyrene opal templates with a large area of more than 10 cm2 were prepared by a doctor-blading technique.Based on this method,high quality inverse opal SnO2 films were then prepared by using a new liquid-phase deposition(LPD)system composed of Sn2F aqueous solution and CaO2.Therein,CaO2 acts as an oxidant and an F-scavenger simultaneously,which makes the LPD method more controllable and eco-friendly.