Abstract
The SnO2/g-C3N4 composites were synthesized via a facile calcination method by using SnCl4·5H2O and urea as the precursor. The structure and morphology of the as-synthesized composites were characterized by the techniques of X-ray diffraction (XRD), the field-emission scanning electron microscopy and transmission electron microscopy (SEM and TEM), energy dispersive spectrometry (EDS), thermal gravity and differential thermal analysis (TG-DTA), and N2-sorption. The analysis results indicated that the as-synthesized samples possess the two dimensional structure. Additionally, the SnO2 nanoparticles were highly dispersed on the surface of the g-C3N4nanosheets. The gas-sensing performance of the as-synthesized composites for different gases was tested. Moreover, the composite with 7 wt % g-C3N4 content (SnO2/g-C3N4-7) SnO2/g-C3N4-7 exhibits an admirable gas-sensing property to ethanol, which possesses a higher response and better selectivity than that of the pure SnO2-based sensor. The high surface area of the SnO2/g-C3N4 composite and the good electronic characteristics of the two dimensional graphitic carbon nitride are in favor of the elevated gas-sensing property.
Highlights
In recent years, poisonous and harmful gases of industrial production have frequently leaked.organic poisonous gases, such as methylbenzene and formaldehyde, volatilize from furniture and newly-decorated houses
In the past several years, considerable attentions have been dedicated to metal-oxide semiconductor (MOS)
We report a facile calcination approach to synthesize different mass ratios of
Summary
Poisonous and harmful gases of industrial production have frequently leaked. SnO2 , a typical n-type metal-oxide semiconductor with a rutile crystalline structure, is widely used to detect different kinds of gases such as ethanol [14], formaldehyde [15], acetone [16], nitrogen dioxide [17], etc. These are all due to their remarkable characteristics such as Nanomaterials 2017, 7, 98; doi:10.3390/nano7050098 www.mdpi.com/journal/nanomaterials. A unilaminar sp2 -hybridized carbon atoms configuration, exhibits an excellent performance, including a large specific surface area, better electronic conductivity, and superior stability On account of these advantages, graphene and reduced graphene oxide are widely used as gas-sensing materials to detect different kinds of gases. The mechanism of the as-prepared sample gas-sensing to ethanol was discussed, in detail
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