Effect of vanadium pentoxide concentration in ZnO/V₂O₅ nanostructured composite thin films for toluene detection

Abstract

ZnO/V2O5 nanocomposite thin films were synthesised by the spray pyrolysis technique with optimised deposition parameters by varying the concentration of vanadium pentoxide.

Modified graphene quantum dots-zinc oxide nanocomposites for photocatalytic degradation of organic dyes and commercial herbicide

“…Besides, the diffraction patterns are not shifted indicating the nanocomposite formation. 24 The characteristic diffraction peak of GQDs (2θ ∼ 21°) is not detected in comparison to another report, 25 which may be due to the low GQD content. Note that the small diffraction peak of around 29.40° is observed.…”

“…For XRD analysis, lattice parameters including lattice constants “ a ” and “ c ”, and interlayer spacing ( d hkl ) were calculated as shown in Table 1, according to equations (1) to (3). 24,31,32 …”

“…The crystal size ( D ), dislocation density (ε), and texture coefficient ( T c ) were calculated using equations (4) to (6) as listed in Table 2 23,24,31,33,34 where k is a constant (0.89), β is the full-width at half-maximum intensity, I ( hkl ) is the intensity of preferred orientation plane from measurement, I 0( hkl ) is the standard intensity of preferred orientation plane from JCPDs, and N is the number of considered planes. The crystal size of GQDs–ZnO nanocomposites initially increases with the increase in the GQD concentration until it reaches the maximum value and slightly decreases afterward for all planes.…”

A Review of Nanostructured Resistive-Based Vanadium Oxide Gas Sensors

“…In another study, the effect of ZnO addition on the room temperature toluene sensing properties of ZnO/V 2 O 5 nanocomposite thin films was systematically studied. ZnO/V 2 O 5 nanocomposites were deposited using spray pyrolysis for the detection of toluene at 27 • C [103]. The response to toluene was improved by the addition of V 2 O 5 to the ZnO thin film and the sensor with a composition of 70 wt% ZnO showed a response of 2.3 to 400 ppm toluene which was the highest response among the gas sensors.…”

Fabrication of ultrasensitive hexagonal disc structured ZnO thin film sensor to trace nitric oxide

“…Thin films of ZnO are expected to exhibit a high degree of gas sensitivity, mainly because of their polycrystalline nature and large exposed surface area [22]. There are various methods to engineer the surface morphology of ZnO like choosing appropriate salts [23], directing agent, varying growth time, precursor ratio [24], annealing process [25,26], by nanocomposites [27], by doping [28], etc.…”