Preparation, characterization, and gas-sensing properties of Pd-doped In_2O_3 nanofibers

摘要

Pure and Pd-doped In_2O_3 nanofibers are synthesized via a simple electrospinning method and characterized by scanning electron microscopy and X-ray diffraction. Comparing with pure In_2O_3 nanofibers, Pd-doped In_2O_3 nanofibers exhibit much higher sensitivity to ethanol at 200 ℃. The sensor fabricated from Pd-doped In_2O_3 nanofibers can detect ethanol down to 1 ppm (the corresponding sensitivity is 4) with good selectivity, and the response and recovery times are 1 and 10 s, respectively. The sensing mechanism and the effect of Pd doping are discussed. The results indicate that the Pd-doped In_2O_3 nanofibers can be used to fabricate high performance ethanol sensors.