Na-Doped ZnO and RGO Composite-Based Flexible Acetone Gas Sensor Operated in Room Temperature

Lei Zhang,Qiulin Tan,Yang Yan Hao Guo,Guanyu Liu

doi:10.1109/access.2020.3023028

Lei Zhang, Qiulin Tan + Show 2 more

Open Access

https://doi.org/10.1109/access.2020.3023028

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Abstract

Real-time health monitoring is important in disease prediction, prevention, and early treatment. In this study, based on Na-doped ZnO/reduced graphene oxide (RGO) heterojunction, an ultrasensitive flexible room temperature gas sensor was developed for lung cancer surveillance diagnosis. The sensing material was synthesized using a simple solution route. X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), scanning electron microscopy (SEM), and Raman spectroscopy were carried out to investigate the structure and chemical properties. The fabricated material has a surface-to-volume ratio, which was important to the sensing property. The gas-sensing performance was measured from 5 ppm to 200 ppm at room temperature (25 °). The proposed sensor demonstrated fast response and recovery time, as well as great repeatability and long-term stability. Furthermore, it exhibited mechanical robustness, and can be bent to different angles with almost no resistance change. Moreover, performance investigation at low acetone concentrations (0.2 ppm to 1.0 ppm) revealed its capability of distinguishing acetone gas as low as 0.2 ppm, with good linearity under different acetone concentration. As such, the developed sensor could provide a promising basis for disease monitoring through detecting the concentration of acetone gas exhaled by human.

Highlights

As the concern for personal health and environment safety increases, development of intelligent sensors, which can detect specific gases in numerous fields such as industry, agriculture, medicine, and environmental monitoring, has advanced [1]–[6]
A survey X-ray photoelectron spectroscopy (XPS) spectrum is given in Fig. 3(g), in which, each peak is found to be consistent with the corresponding element
The presence of Na-O is attributed to Na3C6H5O7·2H2O and NaOH. When they dissolve in deionized water (DI) water, they ionize sufficient sodium ions, which are doped into the Zinc oxide (ZnO) lattice as n-type doping during zinc oxide crystal lattice formation [30]

Summary

Introduction

As the concern for personal health and environment safety increases, development of intelligent sensors, which can detect specific gases in numerous fields such as industry, agriculture, medicine, and environmental monitoring, has advanced [1]–[6]. INDEX TERMS Acetone, flexible sensor, health monitoring, Na-doped ZnO, reduced graphene oxide.

Results

Conclusion