Wireless Sensor Using High Q Resonator of Single Walled Carbon Nanotube for Liquids

Carbon nanotubes are an interesting material, in which the single walled carbon nanotube (SWCNT) can have a high microwave dielectric permittivity and a high conductivity as well. The resonators of the SWCNT were reported as gas sensors in the past. In this paper, we present a wireless sensing property of SWCNT resonators for liquids such as water and alcohols. In the experiments, it was noted that the central resonances frequencies of those excited modes in the resonator of the SWCNT were slightly moved when seeing the water and alcohol, respectively.