Synthesis of WO3 Nanorods and Their Excellent Ethanol Gas-Sensing Performance

Abstract

WO 3 nanorods were synthesized via a simple hydrothermal approach. Their microstructure and morphology were analyzed with x-ray diffraction, scanning electron microscope and x-ray photoelectron spectroscopy. The effects of reaction temperature, reaction time, and citric acid concentration, on the gas-sensing performance of WO 3 nanorods were investigated. The optimized response value of WO 3 sensor to ethanol gas (100 ppm) was 26.48, with a response time of 1 s under a low operating temperature (160 °C). The recovery capability and stability of the gas sensor were tested and discussed. Additionally, the working principle of WO 3 sensor was proposed. In comparison to the sensors published by previous researchers, the WO 3 sensor has shown great potential.

Supplementary document for Photoluminescence-based sensing of ethanol gas with ultrafine WO3 nanorods - 5629400.pdf

“…Nanostructures of WO 3 possess much wider detection range than other sensors on the basis of different morphologies, such as nanoflowers [1], nanorods [2], nanotubes [3], nanofibers [4], microspheres [5], nanosheets [6], network nanostructures [7]. Compared with doped and surface modified WO 3 nanomaterials, Ag-WO 3 sensor [8], Ce-WO 3 sensor [9] and Au-WO 3 sensor [10], Au-SiO 2 -WO 3 [11], NiO-WO 3 [12], Ga 2 O 3 -WO 3 [13],…”

Constructing Z-Scheme WO3–CeO2 Heterojunctions for Selective Sensing of NO2 or Acetone Gas under UV Light Irradiation

“…Metal oxide semiconductors such as SnO 2 , ZnO, In 2 O 3 , TiO 2 , Co 3 O 4 , etc, − are widely used to fabricate gas sensors due to their high sensitivity, fast response/recovery, and low cost. , However, sensors based on various oxides also have the disadvantages of poor selectivity and high operating temperatures. At room temperature, the sensing performance of oxide sensors is not sufficient for actual demand. − …”

High performance and remarkable cyclic stability of a nanostructured RGO–CNT-WO3 supercapacitor electrode

“…mesoporous tungsten oxide, nanostructured tungsten trioxide, amorphous tungsten oxide and others have been studied. [8][9][10][11] Xu He et al developed and synthesized tungsten trioxide microspheres electrode materials with a specic capacitance of 488.78 F g À1 . 12 M. Ashraf et al presented an asymmetric supercapacitor (HRG/m-WO 3 ASC) made of monoclinic tungsten oxide (m-WO 3 ) nanoplates for the negative electrode and highly reduced graphene oxide (HRG) for the positive electrode and exhibited a specic capacitance of 389 F g À1 at a current density of 0.5 A g À1 .…”