Chitosan/citric acid modified laser induced graphene self-powered sensor: Achieving non-contact humidity monitoring using ionic gradients

IF 4.9 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Sensors and Actuators A-physical Pub Date : 2025-10-03 DOI:10.1016/j.sna.2025.117126

Weijie Liu , Aoxun Liang , Meihong Yao , Dengying Zhang , Bao Song , Haoqing Li , Xueye Chen , Fuqiang Sun , Da Li , Xuzhe Han , Changtong Yao

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引用次数: 0

Abstract

In recent years, non-contact wearable humidity sensors have become increasingly important in the monitoring of human respiratory health. However, there are challenges in manufacturing high-performance, convenient, and energy-saving sensors at a low cost. This paper proposes a wearable self-powered humidity sensor based on a chitosan/citric acid-laser-induced graphene (CS/CA-LIG) composite film and simulating a primary battery through a sandwich structure. The upper film absorbs water molecules in the air, and protons in the film diffuse downward driven by the humidity difference. In addition, the mechanism of how zinc/copper electrodes increase the current output performance relying on the redox potential difference is explored, so as to convert the chemical/electrochemical potential generated by humidity gradients and chemical energy into electrical energy, and thus generate electricity through humidity. The proposed self-powered humidity sensor exhibits high sensitivity and response speed when sensing different air humidities. Meanwhile, the proposed CS/CA-LIG sensor has a wide humidity sensing response in the range of 11 %–98 % RH, with a sensitivity of S = 2.01 mV/RH%. We attach the sensor to a mask in a non-contact form to monitor the breathing situation, and also attach it to some parts of the body to monitor the breathing state. By monitoring the amplitude and frequency of its electrical signals, some health conditions of the human body can be sensed. Therefore, this study provides valuable references for non-contact self-powered sensors and is of great significance in the fields of energy issues and medical health sensors.

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壳聚糖/柠檬酸修饰激光诱导石墨烯自供电传感器：利用离子梯度实现非接触湿度监测

近年来，非接触式可穿戴湿度传感器在人体呼吸系统健康监测中发挥着越来越重要的作用。然而，如何以低成本制造高性能、方便、节能的传感器仍存在挑战。本文提出了一种基于壳聚糖/柠檬酸激光诱导石墨烯（CS/CA-LIG）复合薄膜的可穿戴自供电湿度传感器，并通过三明治结构模拟一次电池。上层薄膜吸收空气中的水分子，薄膜中的质子在湿度差的驱动下向下扩散。此外，还探讨了锌/铜电极如何依靠氧化还原电位差提高电流输出性能，从而将湿度梯度和化学能产生的化学/电化学势转化为电能，从而通过湿度发电的机理。所设计的自供电湿度传感器在感知不同空气湿度时具有较高的灵敏度和响应速度。同时，CS/CA-LIG传感器在11 % ~ 98 % RH范围内具有较宽的湿度传感响应，灵敏度S = 2.01 mV/RH%。我们将传感器以非接触式的形式附着在口罩上，以监测呼吸情况，并将其附着在身体的某些部位，以监测呼吸状态。通过监测其电信号的振幅和频率，可以感知人体的一些健康状况。因此，本研究为非接触式自供电传感器提供了有价值的参考，在能源问题和医疗健康传感器领域具有重要意义。

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来源期刊

Sensors and Actuators A-physical 工程技术-工程：电子与电气

CiteScore

8.10

自引率

6.50%

发文量

630

审稿时长

49 days

期刊介绍： Sensors and Actuators A: Physical brings together multidisciplinary interests in one journal entirely devoted to disseminating information on all aspects of research and development of solid-state devices for transducing physical signals. Sensors and Actuators A: Physical regularly publishes original papers, letters to the Editors and from time to time invited review articles within the following device areas: • Fundamentals and Physics, such as: classification of effects, physical effects, measurement theory, modelling of sensors, measurement standards, measurement errors, units and constants, time and frequency measurement. Modeling papers should bring new modeling techniques to the field and be supported by experimental results. • Materials and their Processing, such as: piezoelectric materials, polymers, metal oxides, III-V and II-VI semiconductors, thick and thin films, optical glass fibres, amorphous, polycrystalline and monocrystalline silicon. • Optoelectronic sensors, such as: photovoltaic diodes, photoconductors, photodiodes, phototransistors, positron-sensitive photodetectors, optoisolators, photodiode arrays, charge-coupled devices, light-emitting diodes, injection lasers and liquid-crystal displays. • Mechanical sensors, such as: metallic, thin-film and semiconductor strain gauges, diffused silicon pressure sensors, silicon accelerometers, solid-state displacement transducers, piezo junction devices, piezoelectric field-effect transducers (PiFETs), tunnel-diode strain sensors, surface acoustic wave devices, silicon micromechanical switches, solid-state flow meters and electronic flow controllers. Etc...