Controllable synthesis and enhanced gas sensing properties of a single-crystalline WO₃–rGO porous nanocomposite

Abstract

A single-crystalline WO3–rGO composite has been successfully prepared and applied into gas detection. Impressively, this permit-3D porous nanostructures display enhanced NO2 sensing properties.

ppb level detection of NO2 using a WO3 thin film-based sensor: material optimization, device fabrication and packaging

“…The comparison of present study along with responses observed by other researchers using different nanostructures of WO 3 is shown in Table 1. [42][43][44][45][46][47][48][49][50][51] The present study on the WO 3 thin lm-based NO 2 sensor concludes that sub-ppb level NO 2 detection with high sensitivity and selectivity can be obtained by simple reactive-ion sputtered technique, a scalable process. The WO 3 lm selectivity towards NO 2 was tested in the presence of CO, CO 2 , SO 2 , and NH 3 gases at 150 C. The study clearly indicates the high selectivity of the lm towards NO 2 among other gas species, as represented in Fig.…”

Coal Fly Ash Decorated with Graphene Oxide–Tungsten Oxide Nanocomposite for Rapid Removal of Pb2+ Ions and Reuse of Spent Adsorbent for Photocatalytic Degradation of Acetaminophen

“…A small sharp intensity peak was observed at 881 cm –1 because of the stretching vibration of the W–O–W bond of WO 3 NRs on the CFA/GO/WO 3 NRs nanocomposite. 32 The band at 559 cm –1 was assigned to the stretching vibration of Si–O–Si. In summary, these various functional groups on the CFA/GO/WO 3 nanocomposite surface facilitated the adsorption of Pb 2+ ions by providing more adsorption sites.…”

Applications of Ceramic/Graphene Composites and Hybrids

“…This fiber-type composite sensor showed better sensing characteristics than WO 3 for the detection of acetone [ 162 ]. Good sensing characteristics for NO 2 detection were demonstrated by single-crystalline WO 3 /rGO porous nanocomposites (4.1–9.7 wt.% of rGO) prepared by the hydrothermal method [ 163 ] Figure 10 a. The gas sensor was fabricated by coating a ceramic tube with the composite and corresponding wiring.…”

“… Example of microstructures of sensors prepared by hydrothermal synthesis: ( a ) transmission electron microscopy (TEM) image of WO 3 /rGO sensor reprinted from reference [ 163 ] published by the Royal Society of Chemistry; ( b.1 ) FESEM and ( b.2 ) TEM views of Fe 2 O 3 -1.0 wt.% rGO composites reprinted from reference [ 180 ], Copyright (2017), with permission from Elsevier. …”