Synthesis of Tin Oxide Nanosheet with Liquid Phase Crystal Growth for Gas Sensing

Abstract

Tuning the morphology and the structure is one of effective method for improving physical and chemical properties of materials. This study introduces sensing properties dependency on morphology and structure of SnO₂. Since a morphology-controlled SnO₂ nanosheet in an aqueous solution possessed large surface of (101) crystal facet, the SnO₂ nanosheet exhibited superior response and recovery times in addition to a high alkene gas selectivity as compared to a SnO₂ nanoparticle, which has large surface of the most stable (110) crystal facet. Furthermore, a structure-controlled bridge-type of SnO₂ nanosheet thin film exhibited an improved gas sensor signal response for the large size of gas molecules. Thus, the improvement of the sensing properties of SnO₂ was realized with tuning of morphology and structure through the precise control of crystal growth in the aqueous solution.