Preparation of SnO Nanosheets and SnO_2 Fine Powders by Hydrazine Method

摘要

SnO nanosheets and SnO_2 nanopowder were prepared by hydrazine(N_2H_4)-based chemical routes and their gas sensing characteristics were investigated. A SnCl_2-Hydrazine complex (Sn[N_2H_4)_x·yH_2O) was formed by a reaction between a SnCl_2 aqueous solution and N_2H_4·H_2O. When this complex was heat-treated at 450℃, SnO_2 nanopowders were prepared by the decomposition of the complex. The sensor fabricated from the SnO_2 nano powders showed a good recovery, fast response and high sensitivity for CO 50 μg/g (R_a/R_g = 1.87), C_2H_5OH 100 μg/g (R_a/R_g=4.80), and acetone 100 μg/g (R_a/R_g = 1.50). SnO nanosheets could be prepared when a NaOH solution was added to the solution containing the complex. SnO_2 nano sheets prepared by the oxidation of SnO nanosheets at 700 ℃ in air atmosphere also showed a good sensitivity (R_a/R_g = 1.79) for CO 50 μg/g at 400℃. The hydrazine method provided an effective tool to controlling the morphology and oxidation state of the tin oxide powders.