Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 234, Issue -, Pages 145-154Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2016.04.070
Keywords
Graphene oxide (GO); Poly(ethyleneimine) (PEI); Quartz crystal microbalance (QCM); Humidity sensor
Funding
- National Science Funds for Creative Research Groups of China [61421002]
- National Natural Science Foundation of China [61101031, 61176006]
- Program for New Century Excellent Talents in University [NCET-13-0096]
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In this work, a novel graphene oxide (GO)/Poly(ethyleneimine) (PEI) layered film was designed and prepared on quartz crystal microbalance (QCM) for humidity detection through a feasible spray process at room temperature. The morphological and chemical properties of GO/PEI layered film were examined by means of field emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS), Fourier Transform infrared spectroscopy (FTIR), and Raman spectroscopy. The effect of GO solution concentration on humidity-sensing characteristics was investigated and an optimized QCM humidity sensor was obtained. An intriguing phenomenon was observed that a three-dimension structure of GO sheets was formed due to the redissolution effect at the interface between PEI and GO layers. Results showed that a layered film QCM sensor exhibited superior humidity sensing properties than a pure GO film or a PEI one including high response, short response/recovery time, small humidity hysteresis (less than 1%RH), excellent repeatability, selectivity and long-term stability. Moreover, the humidity features of sensors were also researched via the method of impedance analysis. Lastly, a convincing sensing mechanism model was established to interpret the enhanced humidity-sensing performance of layered film sensors. The results demonstrated the potential application of GO/PEI layered films to humidity sensors. (C) 2016 Elsevier B.V. All rights reserved.
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