(K,Na)NbO3 Nanofiber-based Self-Powered Sensors for Accurate Detection of Dynamic Strain
(K,Na)NbO3 Nanofiber-based Self-Powered Sensors for Accurate Detection of Dynamic Strain
复制标题
用于精确检测动态应变的 (K,Na)NbO3 纳米纤维自供电传感器
DOI：
10.1021/am5090012
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发表时间：
2015
影响因子：
9.5
通讯作者：
Wang John
中科院分区：
文献类型：
--
作者：
Wang Zhao;Zhang Youdong;Yang Shulin;Hu Yongming;Wang Shengfu;Gu Haoshuang;Wang Yu;Chan H. L. W.;Wang John
采用静电纺丝和聚合物封装工艺成功制备了一种基于（K，Na）NbO 3压电纳米纤维的自供电主动应变传感器。该器件通过产生取决于动态应变的幅度和振动频率的脉冲电压信号，对动态应变表现出快速、主动的响应。当频率固定在1Hz时，电压的峰峰值从0.1mV增加到0.40mV，并且应变从1%变化到6%。在相同的应变幅值下，频率在0.2 ~ 5 Hz范围内变化，输出电压线性增加一个数量级。在较高的应变幅值下，频率对输出电压的影响进一步增强。这种现象是由于纳米纤维在较高的应变率下压电电荷的产生率增加。通过对电压峰值的脉冲间隔进行计数，在感测过程中同步测量振动频率。根据频率相关的感测行为，可以通过校准来提高感测结果的准确性。
A self-powered active strain sensor based on well-aligned (K,Na)NbO3piezoelectric nanofibers is successfully fabricated through the electrospinning and polymer packaging process. The device exhibits a fast, active response to dynamic strain by generating impulsive voltage signal that is dependent on the amplitude of the dynamic strains and the vibration frequency. When the frequency is fixed at 1 Hz, the peak to peak value of the voltage increases from ∼1 to ∼40 mV, and the strain changes from 1 to 6%. Furthermore, the output voltage is linearly increased by an order of magnitude with the frequency changing from 0.2 to 5 Hz under the same strain amplitude. The influence of frequency on the output voltage can be further enhanced at higher strain amplitude. This phenomenon is attributed to the increased generating rate of piezoelectric charges under higher strain rate of the nanofibers. By counting the pulse separation of the voltage peaks, the vibration frequency is synchronously measured during the sensing process. The accuracy of the sensing results can be improved by calibration according to the frequency-dependent sensing behavior.