Ultrafast Growth of h-MoO3 Microrods and Its Acetone Sensing Performance

Abstract

Hexagonal molybdenum trioxide (h-MoO3) was synthesized by microwave-assisted hydrothermal method, allowing an ultrafast growth of unidimensional microrods with well-faceted morphology. The crystalline structure of this metastable phase was confirmed by X-ray diffraction (XRD) and Raman spectroscopy. Scanning electron microscopy (SEM) showed that hexagonal microrods can be obtained in one minute with well-defined exposed facets and the fine control of morphology. Sensing tests of the acetone biomarker revealed that the h-MoO3 microrods exhibit, at low ppm level, good sensor signal, fast response/recovery times, selectivity to different interferent gases, and a lower detection limit of 400 ppb.

Advanced Materials and Nanotechnology for Sustainable Energy and Environmental Applications

“…The yield profiles of FU, 5-HMF and levulinic acid are reported in Figure 4. Under neutral conditions, FU and 5-HMF yields gradually increase, reaching the highest value at 180 • C. The observed decrease in the production of furans at higher reaction temperatures is in line with other reports [46] and can be related to the formation of humin type by-products. Indeed, dark-brown insoluble products were formed in experiments carried out at 240 • C and 300 • C. As expected, under the reaction conditions adopted very low concentrations of levulinic acid (LA) were registered in all investigated reaction temperatures.…”

“…By fitting the sensor response with a logarithmic function Y = 1.28 + 0.13logX (R 2 = 0.99) it is evident how the slope of the curve is greater than the response of diacetyl in water solution. From the fit it is possible to extract the lower detection limit (LDL), the minimum concentration of gas detectable by gas sensor [45,46].…”

Deep eutectic solvent mediated synthesis and fabrication of a WO3–MgO nanocomposite as an electrode material for energy storage applications

“…The redox peaks in the CVs indicate the stored charges, which could be associated with faradaic redox reactions 50 and also showing a better interconnected network with good porosity, thereby leading to better mobilization of ions. 51 The CV of WO 3 at a scan rate of 200 mV s −1 (Fig. S1, ESI†) shows an oxidation peak at 0.44 V (0.019 mA g −1 ) and a reduction peak at 0.21 V (−0.015 mA g −1 ), while the CV of WO 3 –MgO (Fig.…”

Advances in the designs and mechanisms of MoO3 nanostructures for gas sensors: a holistic review

“…Moreover, the gas sensors made of these 1-D nanostructures offer ultra-sensitivity, fast response, higher stability, low-temperature operations, and less power consumptions 101,102 . Till date, variety of 1-D nanostructures including nanobelts 60,72,73,96,99,[101][102][103][104][105] , nanoribbons 56,59,100,106,107 , nanorods 74,75,97,[108][109][110][111][112][113] , nanofibers 76,114 , nanowires 82 and microrods 98,115,116 of MoO3 have been utilized in gas sensors and the following section summarize about these nanostructures with their gas sensing performance and mechanism. An overview of gas sensors based on 1-D MoO3 nanostructures is listed in Table 1.…”