High-Performance Magnetic Sensor Based on Microstructured PDMS

• Main Authors: Yu-Ren Su, 蘇昱仁
• Other Authors: Yang-Fang Chen
• Format: Others
• Language: en_US
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/58839484594955681576

碩士 === 國立臺灣大學 === 物理學研究所 === 105 === Resistive magnetic sensors measure different resistance values at different magnetic fields, in which the magnitude of the magnetic field can be monitored. However, the magnetic field will decline quickly when the distance increases, so that the sensitivity of the sensor for the measurement of the change of magnetic field is greatly desirable. In this thesis, we propose a new approach by the integration of microstructured PDMS embedded with FeNi50 particles and to form a highly sensitive magnetic sensor. Several key factors combined together makes the performance possible. First, FeNi50 nanoparticles possess a very high magnetic susceptibility. Second, the microstructured PDMS has unique features of low viscoelasticity and low elastic resistance. Third, AgNWs have the characteristics of excellent conductivity, enabling to be very sensitive with the change of magnetic field. Fourth, this newly designed device can be operated under a very low operational voltage. Therefore, the magnetic sensor can be integrated with solar cells, and it even can work under room light illumination, which is very useful for the development of wearable devices. In addition, we have demonstrated that our magnetic sensor can be integrated with light emitting diodes and can be used to create touchless panel.