Dou Yuhao, Tang Chengli, Lu Yebo
Faculty of Mechanical Engineering, Zhejiang Sci-Tech University, Hangzhou 310000, China.
College of Information Science and Engineering, Jiaxing University, Jiaxing 314000, China.
Langmuir. 2023 Dec 5;39(48):17436-17445. doi: 10.1021/acs.langmuir.3c02641. Epub 2023 Nov 17.
Self-powered humidity sensors based on friction electric and piezoelectric principles have been proposed in recent years. However, the complicated structure and preparation processes usually involved in these power generation humidity sensors limit their wider application. Herein, we developed a self-powered flexible humidity sensor with a simple structure and facile preparation process based on the primary battery principle. The self-powered humidity sensor consists of copper conductive tape as the positive electrode, nickel conductive tape as the negative electrode, and a carboxymethyl cellulose film dissolved with lithium chloride and sodium chloride as the sensing layer. The sensor exhibits good sensing linearity ( = 0.99791) in a wide relative humidity range (11-95%) with a satisfying response voltage of 41 mV (RH 95%) and excellent flexibility. Furthermore, the conduction mechanism of the sensing film was investigated by the complex impedance and phase angle-frequency spectral measurement and analysis. Multifunctional applications of human respiration monitoring to determine the respiratory rate and type, noncontact sensing, diaper and soil moisture detection, and power generation were demonstrated. The low-cost and facile preparation method in this work could provide a useful strategy for developing a self-powered, flexible, and multifunctional humidity sensor.
近年来，基于摩擦电和压电原理的自供电湿度传感器已被提出。然而，这些发电湿度传感器通常涉及的复杂结构和制备工艺限制了它们的更广泛应用。在此，我们基于原电池原理开发了一种结构简单、制备工艺简便的自供电柔性湿度传感器。该自供电湿度传感器由作为正极的铜导电带、作为负极的镍导电带以及溶解有氯化锂和氯化钠的羧甲基纤维素膜作为传感层组成。该传感器在较宽的相对湿度范围（11 - 95%）内表现出良好的传感线性（ = 0.99791），具有令人满意的41 mV响应电压（RH 95%）和优异的柔韧性。此外，通过复阻抗和相角 - 频率谱测量与分析研究了传感膜的传导机制。展示了该传感器在人体呼吸监测以确定呼吸频率和类型、非接触传感、尿布和土壤湿度检测以及发电等方面的多功能应用。这项工作中低成本且简便的制备方法可为开发自供电、柔性且多功能的湿度传感器提供有用的策略。
