自供能柔性氧化石墨烯湿度传感器的喷墨印刷制备及性能研究

doi:10.15541/jim20180164

摘要/Abstract

摘要：

呼吸频率及呼吸模式检测可用于医疗诊断以及人体健康评估。传统的医学检测器件体积大、能耗高、使用不便捷。针对高性能、低成本、便携式电子产品的迫切需求, 本工作利用氧化石墨烯材料自发极化后对湿度敏感的特性, 通过喷墨印刷方法制备了一种可以实现自供能的平面型湿度传感器。所制备的传感器对湿度响应呈现为线性关系, 并且具有优异的灵敏度、快速响应和恢复特性、多次循环稳定性和长期老化稳定性等特性。基于该传感器可以实现对于人体呼吸频率和呼吸模式等的检测。制备的湿度传感器具有制作简单、成本低、不易受人体行动及外界环境干扰等优点, 适用于实时监测呼吸频率和呼吸模式。

关键词: 湿度传感器, 氧化石墨烯, 自发极化, 呼吸检测, 喷墨印刷

Abstract:

Respiratory frequency and mode could be applied for medical diagnosis and health evaluation. Traditional medical diagnosing devices have bulky size and high cost, and are of inconvenience in use. To fulfill the urgent demand for high-performance, low-cost, and portable electronic devices, this study proposes to fabricate self-powered planar humidity sensors by inkjet-printing method by virtue of the characteristics that graphene oxide self-polarizes and is sensitive to humidity. This sensor linearly responds to the relative humidity, and both responds and recovers rapidly. In addition, this sensor possesses excellent sensitivity and stability after multiple cycling and long-term storage, and has realized monitoring of the respiratory frequency and mode. The humidity sensors in this work is ready to fabricate with low production cost, free from interference by body motion or exterior environment, and suitable for real-time monitoring respiratory frequency and mode.

Key words: humidity sensors, graphene oxide, self-polarization, respiration monitoring, inkjet-printing

中图分类号:

TQ174

王贵欣, 裴志彬, 叶长辉. 自供能柔性氧化石墨烯湿度传感器的喷墨印刷制备及性能研究[J]. 无机材料学报, 2019, 34(1): 114-120.

WANG Gui-Xin, PEI Zhi-Bin, YE Chang-Hui. Inkjet-printing and Performance Investigation of Self-powered Flexible Graphene Oxide Humidity Sensors[J]. Journal of Inorganic Materials, 2019, 34(1): 114-120.

图/表 7

图1 平面型GO湿度传感器制备流程图

Fig. 1 Flow-chart for the fabrication of planar GO humidity sensors

图2 GO湿度传感器响应原理示意图

Fig. 2 Schematic illustration of the working principle of GO humidity sensors

图3 GO湿度传感器形貌图

Fig. 3 Morphologies of GO humidity sensor Top view SEM image with inset showing an enlarged view of GO; (b) Side view SEM image; (c) Schematic illustration of the GO humidity sensor

图4 GO湿度传感器感应电压与电极间距的关系不同间距D电极的光学图片(a) 170 µm; (b) 330 µm; (c) 500 µm; (d) 1000 µm; (e) 不同间距样品感应电压随相对湿度变化曲线; (f)不同间距样品灵敏度

Fig. 4 Correlation between the induced voltage of GO humidity sensor and the electrode spacing Photographs of the electrodes with the spacing D (a) 170 µm, (b) 330 µm, (c) 500 µm, (d) 1000 µm. (e) Induced voltage vs relative humidity for sensors with varied electrode spacing. (f) Sensitivity of sensors with varied electrode spacing

图5 不同长度的GO湿度传感器的特性 (a)感应电压随相对湿度的变化曲线; (b)灵敏度随GO线条长度的变化曲线; (c)对相对湿度的响应曲线; (d)响应/恢复时间随GO线条长度的变化曲线

Fig. 5 Characteristics of humidity sensors with varied length (a) Induced voltage vs relative humidity; (b) Sensitivity vs length; (c) Response at different relative humidity; (d) Response time vs length

图6 GO湿度传感器检测人体呼吸频率图

Fig. 6 Respiratory frequency detected with GO humidity sensors

图7 GO湿度传感器循环稳定性和使用寿命

Fig. 7 Recycling and long-term stability of GO humidity sensors (a) Recycling stability; (b) Enlarged view of the curves between 3040 s and 3100 s in (a); Stability of the sensors before (c) and after (d) storage for three months in a cabinet

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