Effect of pH adjustment in sol-gel synthesis route on grain size of tin dioxide intended for gas sensors application

M. Amjoud1*, B. Rhouta2, A. Alimoussa3, L. Hajji3, D. Mezzane3, H. Ahamdane4

1 laboratoire de chimie physique appliquée, FST Gueliz, Av Abdelkrim Khattabi, BP 549, Marrakech, Maroc

2 laboratoire de chimie des matériaux et environnement, FST Gueliz, Av Abdelkrim Khattabi, BP 549, Marrakech, Maroc

3 Laboratoire d’étude structurale, électrique et optique, FST Gueliz, Av Abdelkrim Khattabi, BP 549, Marrakech, Maroc

4 Laboratoire des matériaux FSS, PB 2390, Marrakech, Maroc

* Corresponding author. E-mail: m.amjoud@fstg-marrakech.ac.ma

Received : 31 May 2004; revised version accepted : 26 October 2004

Abstract

Tin dioxide was synthesized by sol-gel technique from tin tetrachloride precursor at a pH value of about 3. The physical properties were investigated by using thermal analysis (DTA-TGA) and X-ray diffraction (XRD). The electrical properties were achieved in various atmospheres (ambient air, synthetic air and ethanol vapour). The pH adjustment mode affected the grains sizes and thus the detection performances of tin dioxide.

Keywords: Tin dioxide; Sol-gel preparation; Grain size; Gas sensor.

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