Noble Metal-Doped In_2O_3 for Enhancing Response to H_2

摘要

Nanocrystalline In_2O_3 was synthesized through a controllable solvothermal process in one-step at 210℃ for 24 h. Gas sensing properties were tested by mixing gas in air in static state. At 268.5℃, the nanocrystal showed high sensitivity to LPG but lower sensitivity to H_2 and CO. In order to enhance the sensitivities to H_2 and CO, 0.5 mass % Au and Pd were doped by an impregnation process. The sensitivities to H_2 and CO were increased under different working temperature. Au-doped In_2O_3 was superior to Pd-doped In_2O_3 whatever to H_2 or CO; the sensitivity was increased with the increase of working temperature; gas sensing properties to H_2 overmatched to CO.