Inkjet-printing and Performance Investigation of Self-powered Flexible Graphene Oxide Humidity Sensors

doi:10.15541/jim20180164

Abstract

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

CLC Number:

TQ174

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.

Figures/Tables 7

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

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

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

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

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

Fig. 6 Respiratory frequency detected with GO humidity sensors

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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