A multimodal impedimetric sensor for humidity and mechanical pressure using a nanosized SnO.sub.2-Mn.sub.3O.sub.4 mixed oxide

The authors describe a sensor based on the deposition of the binary oxide SnO.sub.2-Mn.sub.3O.sub.4 between copper electrodes fixed on a glass substrate. The impedance of the sensor is shown to strongly depend on relative humidity (RH) and mechanical pressure. A silicone adhesive was added to the bi...

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Bibliographic Details
Published in:Mikrochimica acta (1966) 2018-01, Vol.185 (1)
Main Authors: Khan, Sher Bahadar, Karimov, Kh. S, Din, Alaud, Akhtar, Kalsoom
Format: Article
Language:English
Subjects:
Humidity
Sensors
Online Access:Get full text
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Summary:The authors describe a sensor based on the deposition of the binary oxide SnO.sub.2-Mn.sub.3O.sub.4 between copper electrodes fixed on a glass substrate. The impedance of the sensor is shown to strongly depend on relative humidity (RH) and mechanical pressure. A silicone adhesive was added to the binary oxide nanomaterials and investigated with respect to its effect on the sensing performance. The impedance of the material decreases by a factor of 54.7 with increasing RH in the range of 10-90% in pristine SnO.sub.2-Mn.sub.3O.sub.4 nanorods, but 29.6 times in SnO.sub.2-Mn.sub.3O.sub.4 nanocomposites. Capacitance increases 390 times in pristine SnO.sub.2-Mn.sub.3O.sub.4 and 26.6 times in SnO.sub.2-Mn.sub.3O.sub.4 silicone nanocomposite at 100 Hz on going from 10 to 90% RH. Similarly, the impedance of the sensor also depends on mechanical pressure. The impedance of the material decreases by 80% on applying a mechanical pressure of 11.0 kN·m.sup.-2, while capacitance increases by 70% at the same pressure.
ISSN:0026-3672
DOI:10.1007/s00604-017-2584-6