Self-Powered Magnetic Sensor Based on a Triboelectric Nanogenerator

Magnetic sensors are usually based on the Hall effect or a magnetoresistive sensing mechanism. Here we demonstrate that a nanogenerator can serve as a sensor for detecting the variation of the time-dependent magnetic field. The output voltage of the sensor was found to exponentially increase with increasing magnetic field. The detection sensitivities for the change and the changing rate of magnetic field are about 0.0363 +/- 0.0004 In(mV)/G and 0.0497 +/- 0.0006 In(mV)/(G/s), respectively. The response time and reset time of the sensor are about 0.13 and 034 s, respectively. The fabricated sensor has a detection resolution of about 3 G and can work under low frequencies (<0.4 Hz).