Conductive Polymer (Graphene/PPy)-BiPO4 Composite Applications in Humidity Sensors.

Zhen Zhu,Murthy Chavali,Ming-Hong Chuang,Ren-Jang Wu,Wang-De Lin,Zhi-Yi Lin

doi:10.3390/polym13122013

Zhen Zhu, Murthy Chavali + Show 4 more

Open Access

https://doi.org/10.3390/polym13122013

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Journal: Polymers	Publication Date: Jun 20, 2021
Citations: 8	License type: CC BY 4.0

Affiliation: Providence University, Tianjin University of Technology

Abstract

In this particular experiment, a chain of conductive polymer graphene/polypyrrole (Gr/PPy) and BiPO4—or (Gr/PPy)–BiPO4—materials were prepared and used as moisture-sensitive materials. The structure and morphology of the conductive polymer (Gr/PPy)–BiPO4 materials were analyzed using an X-ray diffractometer, scanning electron microscopy, transmission electron microscopy, and energy-dispersive X-ray spectroscopy. Moreover, properties such as hysteresis loop, impedance, sensing response, and response and recovery time were calculated and evaluated using an inductance–capacitance–resistance analyzer. The data expressed that PPy/BiPO4, as prepared in this study, exhibited excellent sensing properties, with impedance changing by only a few orders of range. Furthermore, the response time and time of recovery were 340 s and 60 s, respectively, and negligible humidity hysteresis occurred at different relative humidities. Therefore, conductive PPy/BiPO4, as prepared in the present study, is an excellent candidate for application in humidity sensors.

Highlights

Ambient humidity must be controlled, regulated, and monitored in environments such as dry cabinets, warehouse storage, industrial production, and food processing facilities, as well as in agricultural planting operations, medical diagnostic centers—both facilities in which high-tech instruments are employed—and shelter environments designed for managing life [1,2]
These results indicated that PPy/BiPO4 and Gr/BiPO4 were successfully synthesized
The structure and morphology were by X-ray diffractometer (XRD), Transmission electron microscopy (TEM), FESEM, and

Summary

Introduction

Ambient humidity must be controlled, regulated, and monitored in environments such as dry cabinets, warehouse storage, industrial production, and food processing facilities, as well as in agricultural planting operations, medical diagnostic centers—both facilities in which high-tech instruments are employed—and shelter environments designed for managing life [1,2]. Tremendous scientific effort has been devoted to the detection of environmental humidity. Many types of humidity sensors have been explored due to their advantages, such as high sensitivity, rapid response and recovery, low hysteresis, and excellent reproducibility. Numerous types of humidity-sensing material have been used for humidity detection. Zhao et al prepared a SnO2 /MoS2 hybrid-sensing nanocomposite by synthesis through a two-step hydrothermal route; the sensor with a 5 μm gap had the largest sensitivity at low humidity [13]. Mallick et al enhanced the humidity-sensing properties of polyvinylidene fluoride titanium dioxide (PVDF-TiO2 )

Methods

Discussion

Conclusion