Effect of titanium dioxide (TiO₂) nanoparticle coating on the detection performance of microfiber knot resonator sensors for relative humidity measurement

Faruki, Md Jahid, Ab Razak, Mohd Zulhakimi, Azzuhri, Saaisal R., Rahman, Muhummad Towfiqur, Khalifeh Soltanian, Mohammad Reza, Brambilla, Gilberto, Rahman, B.M. Azizur, Grattan, Kenneth T.V., De La Rue, Richard and Ahmad, Harith (2016) Effect of titanium dioxide (TiO₂) nanoparticle coating on the detection performance of microfiber knot resonator sensors for relative humidity measurement. Materials Express, 6 (6), 501-508. (doi:10.1166/mex.2016.1342).

Abstract

In this study, the sensitivity and the linearity of the un-coated and TiO₂-coated microfiber knot resonator (MKR) have been analyzed. The MKR is very sensitive to humidity changes since its refractive index is strongly humidity dependent. As a result, shifts occur in the resonance wavelength and there are also changes in output power. The un-coated MKR showed a sensitivity of 1.3 pm/%RH, in terms of the resonance wavelength, and a sensitivity of 0.0626 dB/%RH for the transmitted output power. The sensitivity increased greatly after the deposition of a porous TiO₂ nanoparticle coating on the MKR. The TiO₂-coated MKR showed an improved sensitivity of 2.5 pm/%RH, with respect to the resonance wavelength, and 0.0836 dB/%RH for the transmitted output power. This MKR sensor has the potential for use in a variety of humidity sensing applications.

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Contributors

Author: Gilberto Brambilla

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