Modified WO₃ nanosheets by N-GO nanocomposites to form NO₂ sensor

Abstract

In this work, WO 3 nanosheets were synthesised and decorated with different percentages of N-GO nanocomposites to study gas sensing assets. The X-ray diffraction (XRD) and Raman spectra showed fine crystal quality. Scanning electron microscope (SEM) and transmission electron microscopy (TEM) illustrated nanosheets morphology for WO3 and confirmed its decoration. The variation of the sensor electrical resistance was studied at various gas concentrations in the range of temperature intervals. The optimal operational temperature was 200 C. The optimum response signal and recovery time for WO 3 -N-GO 6% at 200 ppm concentration were 90 s and 205 s, respectively. The selectivity of the WO 3 -N-GO samples was 53%, 46% and 60% for WO 3 -N-GO 3%, WO 3 -N-GO 6% and WO 3 -N-GO 9%, respectively at 200 C. The highest response was found for WO 3 -N-GO 9% to NO 2 (58%) and WO 3 -N-GO 6% to CO (28%) at 200 C. Therefore, by selecting the optimum percentage of N-GO nanocomposites, the sensors can be fabricated with the highest response to NO 2 or CO.

Facile preparation of electrodes based on WO3 nanostructures modified with C and S used as anode materials for Li‐ion batteries

“…The reason of this diminution is the presence of a carbon layer on the electrode surface and its amorphous structure. Moreover, it can also be stated that the carbon coating procedure did not damage the composition of WO 3 as all the peaks observed in the WO 3 sample are also seen in the WO 3 /C 43,44 …”

“…Moreover, it can also be stated that the carbon coating procedure did not damage the composition of WO 3 as all the peaks observed in the WO 3 sample are also seen in the WO 3 /C. 43,44 Finally, after thiourea annealing treatment under argon atmosphere, the XRD pattern displays peaks of both WS 2 and WO 3 . The characteristic peak associated with WS 2 is that which appears at 14.2 • and corresponds to the (0 0 2) h k l plane.…”

The Modification of WO3 for Lithium Batteries with Nickel-Rich Ternary Cathode Materials

“…After 300 cycles, the discharge specific capacity of NCM622-W4.0 was equivalent to that of the original sample after 200 cycles. This indicates that the addition of W effectively suppresses structural cracking or collapse during the cycling, resulting in excellent CP [34]. Figure 7 shows the full XPS spectrum, showing the valence states of each element.…”

The Influence of 2-Methoxyethanol as Capping Agent on WO3-Based Carbon Monoxide Gas Sensor Characteristics

“…Along with Stannic oxide, Tungsten oxide is already used for commercial gas sensor devices [9,10]. WO3 has been used as material for the gas sensor to detect various gases such as H2S [11][12][13], NH3 [14], alcohol [15], acetone [16][17][18], NO2 [19][20][21][22][23][24], SO2 [25,26], H2 [27], and Carbon Monoxide [22,[28][29][30]. Tungsten oxide has excellent physical and chemical characteristics, including a high oxygen vacancy level and a large effective surface area [13].…”