Abstract
Porous Cu-doped SnO2 thin films were synthesized by the sol-gel dip-coating method for enhancing methanol sensing performance. The effect of Cu doping concentration on the SnO2 sensibility was investigated. XRD data confirm that the fabricated SnO2 films are polycrystalline with tetragonal rutile crystal structure. AFM and SEM micrographs confirmed the roughness and the porosity of SnO2 surface, respectively. UV-Vis spectrum shows that SnO2 thin films exhibit high transmittance in the visible region ~95%. The band gap (3.80 - 3.92 eV) and the optical thickness (893 - 131 nm) of prepared films were calculated from transmittance data. The sensing results demonstrate that SnO2 films have a high sensitivity and a fast response to methanol. In particular, 3% Cu-SnO2 films have a higher sensitivity (98%), faster response (10-2 s) and shorter recovery time (18 s) than other films.
Highlights
In recent years, the detection methods of toxic chemical species and measurement of their concentration in-How to cite this paper: Benzitouni, S., Zaabat, M., Khial, A., Rechem, D., Benaboud, A., Bouras, D., Mahdjoub, A., Toubane, M. and Coste, R. (2016) High Sensitivity of Porous Cu-Doped SnO2 Thin Films to Methanol
The Sn-O bonds were necessary for the formation of SnO2 films, which are obtained by the hydrolysis reaction between the Tin and the solvent
To investigate the effect of copper doping concentration on the physical and sensing properties of SnO2, tin oxide thin films were fabricated at several concentrations of Cu: (0% Cu, 3% Cu, and 6% Cu)
Summary
The detection methods of toxic chemical species and measurement of their concentration in-How to cite this paper: Benzitouni, S., Zaabat, M., Khial, A., Rechem, D., Benaboud, A., Bouras, D., Mahdjoub, A., Toubane, M. and Coste, R. (2016) High Sensitivity of Porous Cu-Doped SnO2 Thin Films to Methanol. This interest is mainly due to environmental considerations [1]-[5]. In the field of detection of chemical species, we must distinguish chemical sensors and in particular micro-sensors and microdevices that play a critical role in environmental monitoring and environmental control (air, water), facilitating a better quality of life. Shipping devices ever smaller micro-level have capabilities to control the nanomaterials such as: biological, chemical and pathological samples [6] [7]. In this context, the study focuses on the detection of methanol, which has strong toxicity, and can cause death because of its depressant properties on the central nervous system and blood system
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