Enhancement of the Humidity Sensing Performance in Mg-Doped Hexagonal ZnO Microspheres at Room Temperature
School of Physical Science and Technology, Xinjiang University, Urumqi 830046, China
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Authors to whom correspondence should be addressed.
Sensors 2019, 19(3), 519; https://doi.org/10.3390/s19030519
Received: 28 December 2018
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Revised: 16 January 2019
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Accepted: 22 January 2019
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Published: 26 January 2019
(This article belongs to the Section Chemical Sensors)
In this paper, Mg-doped black ZnO microspheres with the characteristics of large surface area and surface oxygen vacancies were synthesized using the sol-gel method. The humidity sensing behavior of the Mg-doped ZnO for relative humidity (RH) from 11% to 95% was measured at room temperature. The superior humidity sensing performance recorded for Mg-doped ZnO microspheres (1.5 mol%) exhibits a dramatic change of impedance of about four orders of magnitude, excellent sensing linearity, small hysteresis (4.1%), a fast sensing response time of as low as 24 s, and a recovery time of 12 s. Our studies demonstrate that Mg dopant can significantly enhance the humidity sensing performance of black ZnO. This benefits from the Mg-doped ZnO (1.5 mol%) microspheres having a high level of surface adsorption and the abundant oxygen vacancies on the surface. Such a new material could be very useful to develop simple and high-performance humidity sensors for future applications in varying commercial fields and industries.
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Keywords:
sol-gel; black ZnO; Mg-doped ZnO; relative humidity sensors
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MDPI and ACS Style
Lin, C.; Zhang, H.; Zhang, J.; Chen, C. Enhancement of the Humidity Sensing Performance in Mg-Doped Hexagonal ZnO Microspheres at Room Temperature. Sensors 2019, 19, 519. https://doi.org/10.3390/s19030519
AMA Style
Lin C, Zhang H, Zhang J, Chen C. Enhancement of the Humidity Sensing Performance in Mg-Doped Hexagonal ZnO Microspheres at Room Temperature. Sensors. 2019; 19(3):519. https://doi.org/10.3390/s19030519
Chicago/Turabian StyleLin, Cunchong, Hongyan Zhang, Jun Zhang, and Chu Chen. 2019. "Enhancement of the Humidity Sensing Performance in Mg-Doped Hexagonal ZnO Microspheres at Room Temperature" Sensors 19, no. 3: 519. https://doi.org/10.3390/s19030519
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