TITLE:
Influence of Mn Doping on the Sensing Properties of SnO2 Nanobelt to Ethanol
AUTHORS:
Jieqing Huang, Yingkai Liu, Yuemei Wu, Xinmin Li
KEYWORDS:
SnO2 Nanobelts, Mn3+ Doping, Gas Sensor, Single Nanobelt Device
JOURNAL NAME:
American Journal of Analytical Chemistry,
Vol.8 No.1,
January
12,
2017
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.