Mesoporous PdO/Pt/Al2O3 film produced by reverse-micro-emulsion and its application for methane micro-sensor

Abstract

A simple, versatile and effective reverse micro-emulsion and pyrolysis protocol was presented for in situ growth of a PdO/Pt loaded mesoporous Al₂O₃ film. Noble metal (oxide) nanoparticles with a narrow size distribution were homogeneously dispersed throughout the Al₂O₃ support. Most importantly, the obtained worm-like catalyst network has both a high specific area and highly crystalline, which is favorable for application in methane catalytic combustion. When deposed on a micro-heater and used as a sensor element, the resulting micro-sensor demonstrated a short T₉₀ response time, relatively high signal output, high enough signal/noise ratio and extraordinarily low power consumption for methane detection.