Abstract
Pure zinc hydroxystannate (ZnSn(OH)6) and LiCl-doped ZnSn(OH)6 have been synthesized through a facile wet chemical method. The LiCl-doped samples keep their original spherical morphology as pure ZnSn(OH)6, with some LiCl particles stuck to its surface, providing more active sites for the adsorption and desorption of water molecules. The influence of LiCl doping on the humidity-sensing properties was explored by varying the dopant concentration. The 16 wt% LiCl/ZnSn(OH)6 showed a better humidity-sensing performance than that of the pure ZnSn(OH)6 and other doped samples, including a high resistive sensitivity, a relatively small hysteresis, and a fast response speed. Through the FTIR analysis, the number of hydroxyl groups on the surface structure after aging has been found to decline markedly. These hydroxyl groups provide a platform for the adsorption of water molecules on the surface and promote the dissociation of water molecules. The detriment of aging to sensor performance should not be underrated. The complex impedance spectrum explains the mechanism of the sensor. These results demonstrate that ZnSn(OH)6 has potential application in fabricating humidity sensors, and the sensing performance of the sensor is enhanced by the dopant LiCl.
Highlights
Giuseppe CappellettiIn recent years, sensors have played an essential role in technological development of human society as the devices to record, transmit, process, and store information [1].As one of the crucial branches of sensors, humidity sensors have been rapidly developed and are generally used in many application fields, including industrial process control, environment monitoring, corrosion estimation in industry, moisture monitoring in semiconductors, manufacturing and quality preservation of food [2,3], etc
The ZHS precursor was synthesized by a wet chemical method
The structure of ZHS is cubic perovskite phase, which could be well confirmed by the diffraction patterns, consisting of the PDF card of ZHS
Summary
As one of the crucial branches of sensors, humidity sensors have been rapidly developed and are generally used in many application fields, including industrial process control, environment monitoring, corrosion estimation in industry, moisture monitoring in semiconductors, manufacturing and quality preservation of food [2,3], etc. The development of humidity sensors with shorter response and recovery time, higher sensitivity, wider humidity detection range, repeatability, long-term stability, and better linear response is the frontier field of sensor research. The perovskite structure has two differently sized cations, which makes it amenable to a variety of dopant additions. This doping flexibility allows for control of the transport and catalytic properties to optimize sensor performance for particular applications [13,14,15,16]
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