An easy to use and easy to fabricate sun exposure sensor was prepared via the inkjet printing of titanium dioxide (TiO 2 ), polyvinylpyrrolidone (PVP), and food dye on paper. The sun exposure sensor works by employing titanium dioxide (TiO 2 ) as a photocatalyst to degrade the food dyes resulting in gradual discoloration of this film. The PVP serves as a binder to allow film formation. The discoloration can be observed by the naked eye or quantitatively monitored using UV−vis reflectance spectra. Finally, discoloration of the films was calibrated to match UV exposure time of different skin types, by using different UV neutral density filters with the ability to transmit between 1.5% and 70% of the irradiant UV light from the sources to the photoactive film.

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In this research, hydrothermal-calcination route was applied to synthesize In 2 O 3 nanoparticles for gas sensor application. Hydrothermal synthesis with duration of 5 h at 180°C resulted in In(OH) 3 nanorods. Then, in the calcination step, considering controlled rate of heating and temperature, In 2 O 3 nanoparticles with rough surfaces were obtained. In the next step, these nanoparticles were deposited by low frequency AC electrophoretic deposition between the interdigitated electrodes to fabricate gas sensor. Deposition in the frequency of 10 kHz resulted in the chained nanoparticles in the interelectrode space. At the end, gas sensitivity measurements were conducted at 150°C-300°C and revealed that fabricated sensor had fast response and recovery times to NO 2 gas.S. Bhandarkar-contributing editor Manuscript No. 31711.

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