Temperature-independent relative humidity sensing properties of polymer micro-bottle resonators coated with graphene oxide.

• Present a new polymer-based (Locatite3525) microbottle resonator fabricated by UV light irradiation and thermal reflow technology. • By optimizing the concentration of the dip impregnation GO solution, the microbottle resonator exhibited high RH sensitivity and figure of merit of 0.161 nm/%RH and 2.01/%RH. • After high-temperature annealing at 300 °C, temperature sensitivity of the microbottle resonator decreased by an order of magnitude, which significantly reduces the cross-sensitivity between humidity and temperature. A polymer-based micro-bottle resonator coated with graphene oxide (GO) film is presented to improve the relative humidity (RH) sensing performance. Polymeric material Loctite 3525 was coated onto a quartz fiber and cured by using UV light irradiation and thermal reflow technology. A layer of GO film was prepared on the micro-bottle resonator by the dip impregnation method, which realized a high Q-factor (>104) transmission of energy by appropriately designing a wave-guide resonator coupling. By optimizing the concentration of GO dip impregnation solution, high sensitivity and figure of merit (FoM) of 0.161 nm /%RH and 2.01/%RH were achieved in the RH range of 22–81%. In addition, after high-temperature annealing at 300 °C, the temperature sensitivity decreased by an order of magnitude from 0.793 nm /°C to 0.068 nm /°C, which significantly reduces the cross-sensitivity between humidity and temperature. The proposed resonator has the advantages of being compact in size, low in cost, high sensitivity, and low in temperature crosstalk. [ABSTRACT FROM AUTHOR]