Printed Acoustic Sensor for Low Concentration Volatile Organic Compound Monitoring

Printed electronics employing flexible substrate offers prospective features for various applications such as, tactile sensing, energy harvesting, wearable and acoustic wave sensors. In this work, an FPW (flexural plate wave) sensor is printed on thin PZT-PDMS (lead zirconate titanate-poly dimethyl siloxane) composite film with silver ink. The prototype resonator has a resonant frequency of 22.65 MHz attenuation -1.552 dBm. Gravimetric mass sensitivity the was measured by applying PDMS layers in between input output interdigital transducers (IDTs). to be -7.8 cm 2 /g. highly responsive VOCs (volatile organic compounds) as sensing layer. Gas sensitivities acetic acid toluene concentrations were 0.66 160.63 kHz/ppm, respectively. limit detection 10.9 0.03 ppm, Further, shows good repeatability response time both VOCs. thermal stability high piezoelectric charge coefficient compared other polymer substrates are advantageous sensor. reported gas potential low concentration measurement