Sensors & Transducers Journal
(ISSN 1726- 5479)
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205.767 |
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(ISSN 1726- 5479) |
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Vol. 137, Issue 2, February 2012, pp. 155-164
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Nanocrystalline Tin Oxide to be Applied in a Gas Sensor
1 Mario F. BIANCHETTI, 2 Ines BRACKO, 2 Sreco Davor SKAPIN, 1 Noemí E. WALSÖE de RECA 1 CINSO (Centro de Investigaciones en Sólidos) CONICET-CITEDEF, Juan B. de La Salle 4397, Villa Martelli (B1603ALO) Buenos Aires, Argentina 2 Advanced Materials Department, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
Received: 24 November 2011 /Accepted: 14 February 2012 /Published: 28 February 2012 |
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Abstract: The aim of this paper was to describe the methods of nanocrystalline SnO2 preparation and to show the improvement of the behaviour of a hydrogen sensor built with the grown SnO2 nanoparticles since particular properties of the nanomaterial are related to the sensor response. Nanocrystalline SnO2 was synthesized by gel-combustion and by reactive oxidation methods. Characterization was performed by X-Ray Diffraction (XRD), Brunauer-Emmer-Teller isotherms (BET) absorption and by High Resolution Transmission Electron Microscopy (HRTEM). A careful characterization enabled to control the crystallites size and properties to improve the behaviour of a hydrogen sensor. It was proved that if nanocrystalline SnO2 was used to build the resistive sensor, replacing the conventional microcrystalline SnO2, the sensor sensitivity increased between 30 and 35 % (according to the grown crystallites size of nanocrystalline SnO2) and the working temperature (Tw) decreased from 350-450 ºC to 180-220 ºC. The Tw decrease obliged to improve the heating and measuring system of sensor which is also described.
Keywords: Nanocrystalline tin oxide, Synthesis and characterization of tin oxide, Gel-combustion, Reactive oxidation method, Hydrogen sensor
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