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(a) Photochemical behaviors that occurred when the as-fabricated sensor was post irradiated with UV light in water; (b) the resistance variation of the sensor from Film-1.0 in air with the UV irradiation; (c) responses of the sensor after irradiated different times to 200 ppm ethanol gas; (d) the ratios between the sensitivities of sensor after and before different UV-irradiation times.
