Fig. 5: Sensing characteristics of the resonator vibrating in air and hexane.

a Frequency response in air measured from the in-phase component of the output voltage, and its variations versus excitation voltage. b Frequency response in air measured from the quadrature component of the output voltage, and its variations versus excitation voltage. c Quantified variations in resonant frequency and quality factor versus excitation voltage amplitude in air. d Frequency response of the resonator vibrating in hexane