Abstract
Mn doped SnO2 nanobelts (Mn:SnO2 NBs) and pure SnO2 nanobelts (SnO2 NBs) were synthesized by thermal evaporation technique at 1355°C with Ar carrier gas (25 sccm, 150 Torr). The SEM, EDS, XRD, TEM, HRTEM, SAED, XPS, UV-Vis techniques were used to characterize the attained samples. The band gap of Mn doped SnO2 NBs by UV-Vis was measured to be 3.43 eV at room temperature, lower than that of the pure counterpart with ~3.66 eV. Mn:SnO2 NB and pure SnO2 NB sensors were developed. It is found that Mn:SnO2 NB device exhibits a higher sensitivity with 62.12% to 100 ppm of ethanol at 210°C, which is the highest sensitivity among the three tested VOC gases (ethanol, ethanediol, and acetone). The theoretical detection limit for ethanol of the sensor is 1.1 ppm. The higher response is related to the selective catalysis of the doped Mn ions.
Highlights
Metal-oxide semiconductor gas sensors have been used to detect gases for their efficiency and spread applicability [1] [2]
It is found that Mn:SnO2 NB device exhibits a higher sensitivity with 62.12% to 100 ppm of ethanol at 210 ̊C, which is the highest sensitivity among the three tested volatile organic (VOC) gases
We systemically investigated the sensing and optical properties of a single Mn:SnO2 NB sensor to volatile organic (VOC) liquids and reported interesting results
Summary
Metal-oxide semiconductor gas sensors have been used to detect gases for their efficiency and spread applicability [1] [2]. Li et al have reported that the sensitivity of Er-doped SnO2 nanobelt device is 9 to the formaldehyde gas [17]. Doping enhances the properties of semiconductors by providing a powerful strategy to control their optical, electronic, transport, and spintronic properties [19]. The optoelectronic properties such as photoluminescence and optical band gap of SnO2 can be improved by metals doping. We systemically investigated the sensing and optical properties of a single Mn:SnO2 NB sensor to volatile organic (VOC) liquids and reported interesting results
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