Abstract
RGO/SnO nanocomposites were prepared by a simple blending method and then airbrushed on interdigitated electrodes to obtain the corresponding gas sensors. The characterizations of SEM, TEM, Raman, XRD and FTIR were used to characterize the microstructures, morphologies and surface chemical compositions of the nanocomposites, indicating that the two materials coexist in the composite films and the concentration of surface defects is affected by the amount of SnO nanoparticles. It is also found that the room temperature sensing performance of RGO to NO can be improved by introducing appropriate amount of SnO nanoparticles. The enhanced NO sensing properties are attributed to the rough surface structure and increased surface area and surface defects of the nanocomposite films. Since further reduction of RGO, heat treating the sensing films resulted in a decrease in the response and recovery times of the sensors. Furthermore, the sensor annealed at 200 C exhibited a small baseline drift, wide detection range, good linearity, high stability and better selectivity.
Highlights
Nitrogen dioxide (NO2 ), a well-known toxic and harmful gas with a pungent odor, is a prominent air pollutant and one of the main causes of acid rain
The different amounts (0, 20, 40 and 80 mg) of SnO2 nanopowders were added into 10 mL diluted RGO dispersion (0.0215 wt%) and ultrasonicated for 20 min to obtain the composite solutions that the weight percentages of RGO were 100%, 9.7%, 5.1% and 2.6%. 0.5 mL of RGO, 9.7%RGO/SnO2, 5.1%RGO/SnO2 and 2.6%RGO/SnO2 aqueous dispersions were respectively airbrushed onto interdigital electrodes (IDEs), and dried in a vacuum oven at 70 ◦ C for an hour to fabricate NO2 sensors
A room temperature chemoresistive NO2 sensor based on an RGO/SnO2 nanocomposite film was fabricated via an air-brush spray deposition process
Summary
Nitrogen dioxide (NO2 ), a well-known toxic and harmful gas with a pungent odor, is a prominent air pollutant and one of the main causes of acid rain. It mainly comes from automobile exhaust and factory emissions, which is usually harmful to human beings, animals and plants. Different amount of SnO2 nanopowders were blended with diluted RGO aqueous dispersion (0.0215 wt%), and the pure RGO and RGO/SnO2 composites were deposited on interdigitated electrodes (IDEs) with airbrush technology Their microstructures, surface morphologies and surface chemical compositions, as well as NO2 sensing properties, were investigated
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