Formaldehyde Sensing Properties of SnO–Graphene Composites Prepared via Hydrothermal Method

Effects of Oxygen Ratio on the Properties of Tin Oxide Thin Films Doped with Bismuth

“…As shown in Figure , all samples with different oxygen ratios of 0–20% showed a broad halo peak centered at ≈30.3° 2θ, which was assigned to a SnO 2 phase . Figure also showed that the small sharp peaks of SnO (101) and SnO (112) at 28.6 and 51.3° 2θ, respectively, observed in the sample with an oxygen ratio of 0% weakened and disappeared with increasing oxygen ratio . This suggests that the main n‐type SnO 2 and minor p‐type SnO phases coexist in the sample with an oxygen ratio of 0% and the concentration of SnO phase decreases with increasing oxygen ratio, which causes the growth of the SnO 2 phase with increasing oxygen ratio.…”

Mesoporous Ultrathin SnO2 Nanosheets in Situ Modified by Graphene Oxide for Extraordinary Formaldehyde Detection at Low Temperatures

“…The comparison of the responses to HCHO gas among the mesoporous GO/SnO 2 NS-475 sensor and other reported SnO 2 -based MOS sensors (SnO 2 microspheres, SnO 2 microtubes, and 3D SnO 2 inverse opals), MOS composite sensors (In 2 O 3 /SnO 2 nanospheres, NiO/SnO 2 microspheres, TiO 2 @SnO 2 nanofibers, and octahedral-like Zn 2 SnO 4 /SnO 2 and ZnO/ZnSnO 3 ), MOS/graphene-based sensors (mesoporous SnO 2 /graphene, GO/SnO 2 nanofibers, SnO 2 /graphene, and SnO/graphene) and noble-metal-sensitized MOS sensors (PtO 2 /SnO 2 and Pd/SnO 2 ) is shown in Table and Figure ,,,,− In contrast to most of the MOS, MOS composites, and MOS/graphene-based materials, the GO/SnO 2 NS-475 gas sensor has a lower operation temperature and extremely high sensitivity. It is worth mentioning that the GO/SnO 2 NS-475-based sensor also has a fast response/recovery speed to HCHO gas at 60 °C (Figure b).…”

Quantitative prediction of ternary mixed gases based on an SnO2 sensor array and an SSA-BP neural network model

“…Hydrothermal methods are chemical reactions carried out under certain high temperature and pressure reaction conditions in a closed autoclave with an aqueous solution as the reaction solvent. 19 In the preparation of metal oxides as well as composites, hydrothermal synthesis results in substances with high purity, good dispersion, small particle size, down to the nanometer size, simple process and high yield compared to other synthesis methods. 20 Gas sensors have developed rapidly as an alternative to GC and MS to detect gases.…”