Room temperature and high response ethanol sensor based on two dimensional hybrid nanostructures of WS2/GONRs

Hassan Ahmadvand; Azam Iraji Zad; Raheleh Mohammadpour; Seyed Hossein Hosseini-Shokouh; Elham Asadian

doi:10.1038/s41598-020-71695-3

Room temperature and high response ethanol sensor based on two dimensional hybrid nanostructures of WS₂/GONRs

Sci Rep. 2020 Sep 9;10(1):14799. doi: 10.1038/s41598-020-71695-3.

Authors

Hassan Ahmadvand¹, Azam Iraji Zad^{2

3}, Raheleh Mohammadpour⁴, Seyed Hossein Hosseini-Shokouh⁵, Elham Asadian⁶

Affiliations

¹ Institute for Nanoscience and Nanotechnology, Sharif University of Technology, 14588, Tehran, Iran.
² Institute for Nanoscience and Nanotechnology, Sharif University of Technology, 14588, Tehran, Iran. iraji@sharif.edu.
³ Department of Physics, Sharif University of Technology, 14588, Tehran, Iran. iraji@sharif.edu.
⁴ Institute for Nanoscience and Nanotechnology, Sharif University of Technology, 14588, Tehran, Iran. mohammadpour@sharif.edu.
⁵ School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran.
⁶ Department of Medical Physics and Biomedical Engineering, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran.

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.