Abstract
The development of a flexible and high-performance humidity sensor is essential to expand its new applications, such as personal health monitoring and early diagnosis. In this work, SnO2/rGO nanocomposites were prepared by one-step hydrothermal method. The effect of rGO-doping on humidity sensing performance was investigated. Scanning electron microscopy, transmission electron microscopy, X-ray diffraction and Raman spectroscopy were used to characterize the nanostructure, morphology and chemical composition of SnO2/rGO nanocomposites. The SnO2/rGO humidity sensitive film was prepared by electrospinning on a polyimide film modified with gold electrodes. The humidity test results show that different doping ratios of rGO have different effects on humidity sensing properties. Among them, the sensor with 2 wt% rGO-doping has a high sensitivity (37,491.2%) within the humidity range as well as the fast response time (80 s) and recover time (4 s). Furthermore, the sensor with 2 wt% rGO-doping remains good flexibility and stability in the case of bending (1000 times). The sensitivity of the 2 wt% rGO-doping sensor at the bending radius (8 mm and 4 mm) is 48,219% and 91,898%, respectively. More importantly, the sensor could reflect different breathing states clearly and track breathing intervals as short as 3 s. The SnO2/rGO flexible humidity sensor with accuracy, flexibility and instantaneity as well as the facile fabrication strategy is conceivable to be applied in the potential application for human health real-time monitoring.
Highlights
The SnO2 /rGO flexible humidity sensor with accuracy, flexibility and instantaneity as well as the facile fabrication strategy is conceivable to be applied in the potential application for human health real-time monitoring
The synthesis of sensitive materials is still the key to increase the performance of humidity sensors
Compared to pristine GO, the Theofflexible humidity sensor is required conformal feature,area, which can could effecsurface nanocomposites possessesgood a larger specific surface which tively prevent the cracking of humidity sensitive materials from the substrate and provide more available active sites for water molecules and accelerate the processesthe of damage to the structure
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Compared with pure SnO2 , the SnO2 @G-GO was demonstrated better humidity characteristics with high sensitivity, fast response and good stability [22]. In order to maximize the good performance of sensitive materials, the process of preparing humidity-sensitive film usually requires complicated operation and high costs. Adopting a facile and low-cost method to transfer sensitive materials to a flexible substrate while improving good sensing performance is one of the urgent issues to be addressed. SnO2 /rGO nanocomposites with different doping ratios of rGO were synthesized by a one-step hydrothermal method as sensing materials. The prepared sensor shows good performance including high sensitivity, good flexibility and repeatability. The prepared humidity sensor has great potential in medical care, wearable devices and other intelligent fields
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