Highly Sensitive Acetone Gas Sensor Based on g-C3N4 Decorated MgFe2O4 Porous Microspheres Composites

Abstract

The g-C3N4 decorated magnesium ferrite (MgFe2O4) porous microspheres composites were successfully obtained via a one-step solvothermal method. The structure and morphology of the as-prepared MgFe2O4/g-C3N4 composites were characterized by the techniques of X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), thermal gravity and differential scanning calorimeter (TG–DSC) and N2-sorption. The gas sensing properties of the samples were measured and compared with a pure MgFe2O4-based sensor. The maximum response of the sensor based on MgFe2O4/g-C3N4 composites with 10 wt % g-C3N4 content to acetone is improved by about 145 times, while the optimum temperature was lowered by 60 °C. Moreover, the sensing mechanism and the reason for improving gas sensing performance were also discussed.

Recent advances in methodologies and applications of cataluminescence sensing

“…Generally speaking, CTL-based sensors since their inception have been established mainly for specific gas detection. CTL sensors based on the sensing elements of nanomaterials have broad application for monitoring various VOCs [50] including alcohols [29,[51][52][53][54] , aldehydes [55,56] , ketones [28,[57][58][59][60][61][62] , esters [63] , ethers [64][65][66] , acids [67] , hydrocarbon [47,68,69] , halohydrocarbon [70] , and inorganic small molecule gases [71] , including H 2 S [72][73][74][75][76][77] and CO [21,48,78] , all of which have contributed significantly to environmental monitoring. In addition, the selective detection of some analytes has also functioned to promote medical research and clinical diagnosis.…”

Special Issue “Advanced Nanomaterials Based Gas Sensors”

“…Finally, there is a set of three contributions in which different nanostructured metal oxides were doped following different approaches to enhance sensor performance. In the first case [17], the metal oxide is a magnesium ferrite (MgFe 2 O 4 ) in the form of porous microspheres, modified by g-C 3 N 4 to form a nanocomposite using a solvothermal methodology. The addition of 10% in weight of g-C 3 N 4 led to an increased sensor response for acetone (145 times higher), working at a temperature 60 • C lower, compared with a sensor based on pure MgFe 2 O 4 .…”

Host–Guest Recognition on 2D Graphitic Carbon Nitride for Nanosensing

“…Generally, metal oxide/g-C 3 N 4 composites such as α-Fe 2 O 3 /g-C 3 N 4 , [211] SnO 2 , [212][213][214] ZnO, [215][216][217] WO 3 [218] and MgFe 2 O 4 [219,220] can be synthesized via hydrothermal or solid-state methods. [218] α-Fe 2 O 3 /g-C 3 N 4 nanocomposites were synthesized by Zhang et al via hydrothermal and pyrolysis methods (Figure 16i).…”