Fast response of hydrogen sensor using paladium nanocube ?TiO2 nanofiber composites

초록

In this work, we investigated the properties of resistivity type hydrogen (H2) sensor for monitoring in H2 gas. The H2 sensor was made of Pd nanocube (NCs) and TiO2 nanofiber (NFs) composites. The Pd NCs was synthesized by sed-mediated growth and TiO2 nanofiber was synthesized via electrospining method. The two nanomaterials are then converted into nanocomposites by ultrasonication proces. Pd NCs-TiO2 NFs composite was characterized by scaning electron microscope (SEM) and high resolution transmision electron microscope (HRTEM). The H2 sensing properties including the response/recovery time, the response value and linearity of the synthesized samples were investigated toward to various H2 concentrations (0.6, 0.8 and 1 %). The response of H2 sensor is S = 40.8% and the response/recovery time are 25/1 seconds with 0.6 % at working temperature of 150 °C. Moreover, the H2 sensor has excelent cros-selectivity for H2 compared to ethanol, nitrogen dioxide and isopropyl alcohol.