Polystyrene (PS) opal and titania (TiO 2 ) inverse opal films were fabricated by the self-assembly colloidal crystal template technique. Based on Bragg’s law, these sensors were used to detect the different concentrations of ethanol solution. The results indicated that TiO 2 inverse opal films were advantageous over PS opal film for detecting the ethanol concentration. TiO 2 inverse opal films sintered at 600 °C retained the highest sensitivity for ethanol concentration identification, since the anatase phase was transformed into the rutile phase, which resulted in an enhancement of the refractive index, i.e. , an increase in the amount of the red shift.
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