A self-powered instantaneous wireless sensing platform based on integrated triboelectric nanogenerator and negative resistance LC resonator

Triboelectric nanogenerators (TENG) based self-powered instantaneous wireless sensing systems have attracted much attention for applications. However, such sensing systems typically use passive inductor capacitor (LC) resonators with low-quality factor, Q, as the transmitter, and have very low sensing precision and accuracy due to the tremendously short sensing signals duration of 10-50 mu s and very short sensing distance. Here, we proposed a TENG-based self-powered wireless sensing system with extremely high precision and signal stability by using a negative resistance LC resonator. The introduction of negative resistance greatly increased the system's Q-factor from 102 to 2.6 x 105, and significantly extended the signal duration of up to 1 ms. These allowed the sensor system to achieve a frequency precision and accuracy down to 50 Hz with a fluctuation of less than 0.05 % for a sensing distance of 50 cm, both of them are 40 times better than those of conventional ones (2 kHz, 2 %). A selfpowered wireless gas pressure sensing system was developed, showing a high theoretical sensing precision of 2.4 Pa, demonstrated its great application prospects.