A Novel Bilayer MXene/GO Pressure Sensor Array for Multimode and High-Precision Frequency Regulation

With the rapid development of communication technology, the modulation of signal frequency has become urgent. In order to solve the issues of single mode and low precision, a novel $3\times 3$ bilayer MXene/GO pressure sensor array is designed and then integrated into the relaxation oscillator circuit for the first time. In this work, each sensing unit is fabricated by the cost-effective coating technique (MXene dispersion and GO aqueous solution mix at a volume ratio of 1:6). By recognizing the external pressure distribution (“Y,” “X,” “J,” “H,” and “O”), the sensor array exhibits different rates of resistance variation, thereby achieving multimode frequency regulation. At the same time, due to the extraordinary synergistic effect between MXene and graphene, the sensing units demonstrate ultrahigh sensitivity (14.21 ${\mathrm {kPa}}^{-{1}}\text {)}$ in the low-pressure range (0–1.64 kPa). In addition, characteristics, including short response time (5.9 ms), recovery time (7.6 ms), and low hysteresis (3.9%), ensure high-precision frequency regulation. This MXene/GO pressure sensor array can satisfy diverse modulation demands, showing a wide range of applicability in circuits with adjustable frequency.