SnO₂ two-dimensional nanostructures prepared by solution reduction method and their gas sensing characteristics

SnO nanosheets were prepared at room temperature through a reaction between an aqueous solution of SnCl₂, N₂H₄, and NaOH and were converted into SnO₂ nanosheets without a morphological change. The SnO nanosheets were formed through a dissolution-recrystallization mechanism. Uniform and well-dispersed SnO nanosheets with the round-shape morphology were attained when the solution was treated by ultrasonic sound immediately after the addition of NaOH. The SnO₂ nanosheets prepared by means of solution reduction under the ultrasonic treatment, and subsequent oxidation at 600°C showed a high level of gas sensitivity to C₂H₅OH and CH₃COCH₃.