Noble Metal-Doped In_2O_3 for Enhancing Response to H_2

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.

Nanocrystalline In2O3 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 H2 and CO. In order to enhance the sensitivities to HE and CO, 0.5 mass % Au and Pd were doped by an impregnation process. The sensitivities to H2 and CO were increased under different working temperature. Au-doped In2O3 was superior to Pd-doped In2O3 whatever to H2 or CO; the sensitivity was increased with the increase of working temperature; gas sensing properties to H2 overmatched to CO.