Yu Aifang, Song Ming, Zhang Yan, Kou Jinzong, Zhai Junyi, Lin Wang Zhong
1Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, People's Republic of China. 2School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, USA.
Nanotechnology. 2014 Nov 14;25(45):455503. doi: 10.1088/0957-4484/25/45/455503. Epub 2014 Oct 21.
An AC magnetic field, which is a carrier of information, is distributed everywhere and is continuous. How to use and detect this field has been an ongoing topic over the past few decades. Conventional magnetic sensors are usually based on the Hall Effect, the fluxgate, a superconductor quantum interface or magnetoelectric or magnetoresistive sensing. Here, a flexible, simple, low-cost and self-powered active piezoelectric nanogenerator (NG) is successfully demonstrated as an AC magnetic field sensor at room temperature. The amplitude and frequency of a magnetic field can both be accurately sensed by the NG. The output voltage of the NG has a good linearity with a measured magnetic field. The detected minute magnetic field is as low as 1.2 × 10(-7) tesla, which is 400 times greater than a commercial magnetic sensor that uses the Hall Effect. In comparison to the existing technologies, an NG is a room-temperature self-powered active sensor that is very simple and very cheap for practical applications.
交流磁场作为信息载体，无处不在且具有连续性。在过去几十年里，如何利用和检测该磁场一直是个热门话题。传统磁传感器通常基于霍尔效应、磁通门、超导量子界面或磁电或磁阻传感原理。在此，一种柔性、简单、低成本且自供电的有源压电纳米发电机（NG）在室温下成功被证明可作为交流磁场传感器。磁场的幅度和频率均可被该纳米发电机精确感知。纳米发电机的输出电压与被测磁场具有良好的线性关系。检测到的微小磁场低至1.2×10⁻⁷特斯拉，比使用霍尔效应的商用磁传感器高出400倍。与现有技术相比，纳米发电机是一种室温自供电的有源传感器，在实际应用中非常简单且成本低廉。
