Mesoporous SnO₂ by Nanocasting Route Using Various Silica Templates for Gas Sensing Application

Abstract:

Mesoporous SnO₂ was successfully synthesized via nanocasting route using various silica matrices likely KIT-6, SBA-15 and SBA-16 as hard templates. The chemical and structural properties of these materials were characterized by means of XRD, N₂ adsorption-desorption and TEM analyses. All replica products exhibited well-defined mesoporous structures and large surface areas as well as highly crystalline frameworks. Sensors were fabricated from the as-prepared mesoporous SnO₂ replicas and used to test the response to 1000 ppm of ethanol vapour at different operating temperatures. The results showed that the mesoporous SnO₂ sensors nanocasted from KIT-6, SBA-15 and SBA-16 silica templates exhibits excellent gas response as compared to a bulk SnO₂ material, suggesting the potential application of the sensor for detecting ethanol vapour. Maximum sensitivity (~ 18.7) was reached at 300 °C using mesoporous SnO₂ sensor nanocasted from KIT-6 silica. It can be explained by the large surface area and well-defined mesostructure of SnO_2(KIT-6), which lead to highly effective surface interaction between the ethanol molecules and the surface active sites.

• Periodical: Advanced Materials Research (Volume 1113)
• Pages: 140-146
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1113.140
• Online since: July 2015
• Authors: Jusliha Juhari, Mohamad Zailani Abu Bakar*, Ahmad Zuhairi Abdullah
• Keywords: Ethanol Sensing, KIT-6 Silica, Mesoporous SnO₂, Nanocasting, SBA-15 Silica, SBA-16 Silica

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