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Abstract
Here in this research, room temperature ethanol and humidity sensors were prepared based on two dimensional (2D) hybrid nanostructures of tungsten di-sulfide (WS2) nanosheets and graphene oxide nanoribbons (GONRs) as GOWS. The characterization results based on scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (ESD), Raman spectroscopy and X-ray diffraction (XRD) analysis confirmed the hybrid formations. Ethanol sensing of drop-casted GOWS films on SiO2 substrate indicated increasing in gas response up to 5 and 55 times higher compared to pristine GONRs and WS2 films respectively. The sensing performance of GOWS hybrid nanostructures was investigated in different concentrations of WS2, and the highest response was about 126.5 at 1 ppm of ethanol in 40% relative humidity (R.H.) for WS2/GONRs molar ratio of 10. Flexibility of GOWS was studied on Kapton substrate with bending radius of 1 cm, and the gas response decreased less than 10% after 30th bending cycles. The high response and flexibility of the sensors inspired that GOWS are promising materials for fabrication of wearable gas sensing devices.
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Details
1 Sharif University of Technology, Institute for Nanoscience and Nanotechnology, Tehran, Iran (GRID:grid.412553.4) (ISNI:0000 0001 0740 9747)
2 Sharif University of Technology, Institute for Nanoscience and Nanotechnology, Tehran, Iran (GRID:grid.412553.4) (ISNI:0000 0001 0740 9747); Sharif University of Technology, Department of Physics, Tehran, Iran (GRID:grid.412553.4) (ISNI:0000 0001 0740 9747)
3 University of Tehran, School of Metallurgy and Materials Engineering, College of Engineering, Tehran, Iran (GRID:grid.46072.37) (ISNI:0000 0004 0612 7950)
4 Shahid Beheshti University of Medical Sciences, Department of Medical Physics and Biomedical Engineering, School of Medicine, Tehran, Iran (GRID:grid.411600.2)