Enhanced sensing of ethanol gas using fiber optics sensor by hydrothermally synthesized GO-WO_3 nanocomposites

摘要

We report the enhanced ethanol gas sensing nature of GO-WO_3 nanocomposites using optical fiber sensors at room temperature. The monoclinic-WO_3 nanoplates were synthesized by hydrothermal method and the nanocomposites with GO prepared by dispersion assisted sonication method. For the nanocomposites, the crystalline monoclinic WO_3 structure was verified along with characteristic peak (001) of GO using XRD analysis. The Raman spectra show the shift in the D and G peaks for the nanocomposites along with the presence of vibrational modes of m-WO_3 . The Id/Ig ratio for GO-WO_3 nanocomposite was found to increase to 1.56. The adornment of WO_3 nano plates over the 2-D GO sheets were confirmed by SEM, TEM and AFM studies. The gas sensing nature of the samples was analyzed by a clad modified optical fiber sensor. The gas sensing natures of the samples were highly improved due to the synergic effect of these nanocomposites. The GO-WO_3 nanocomposite (10 wt%) had shown an enhanced gas sensitivity of 5 Counts/100 ppm towards ethanol gas over the range of 0-1000 ppm, whereas all other samples demonstrate a decrease in sensitivity.