UNIDEF   23986
UNIDAD DE INVESTIGACION Y DESARROLLO ESTRATEGICO PARA LA DEFENSA
Unidad Ejecutora - UE
artículos
Título:
Nanocrystalline tin oxide to be applied in a gas sensor
Autor/es:
M.F. BIANCHETTI; I. BRACKO; SKAPIN, S.D.; N.E. WALSÖE DE RECA
Revista:
Sensors & Transducers
Editorial:
IFSA
Referencias:
Año: 2012 vol. 137 p. 155 - 164
ISSN:
1726-5479
Resumen:
The aim of this paper was to describe the methods of nanocrystalline SnO2 preparation and to show theimprovement of the behaviour of a hydrogen sensor built with the grown SnO2 nanoparticles sinceparticular properties of the nanomaterial are related to the sensor response. Nanocrystalline SnO2 wassynthesized by gel-combustion and by reactive oxidation methods. Characterization was performed byX-Ray Diffraction (XRD), Brunauer-Emmer-Teller isotherms (BET) absorption and by HighResolution Transmission Electron Microscopy (HRTEM). A careful characterization enabled tocontrol the crystallites size and properties to improve the behaviour of a hydrogen sensor. It wasproved that if nanocrystalline SnO2 was used to build the resistive sensor, replacing the conventionalmicrocrystalline SnO2, the sensor sensitivity increased between 30% and 35% (according to the growncrystallites size of nanocrystalline SnO2) and the working temperature (Tw) decreased from 350-450ºCto 180-220ºC. The Tw decrease obliged to improve the heating and measuring system of sensor whichis also described.