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 Al 2 O 3 film. Noble metal (oxide) nanoparticles with a narrow size distribution were homogeneously dispersed throughout the Al 2 O 3 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 T 90 response time, relatively high signal output, high enough signal/noise ratio and extraordinarily low power consumption for methane detection.

Design and development of highly sensitive PEDOT-PSS/AuNP hybrid nanocomposite-based sensor towards room temperature detection of greenhouse methane gas at ppb level

“…In recent years, semiconducting metal oxide-based materials have been extensively used as chemiresistive sensors for monitoring environmental methane which can sense CH 4 due to change in their electrical or optical properties. 7,[11][12][13][14][15][16][17] The main drawback of these semiconductor-based metal oxide sensors is being operated at high temperature and mechanically brittle. Hence, there is an urgent need to develop sensors to detect ammable gases such as methane gas in low concentrations at room temperature.…”

Enhancing the Hydrogen-Sensing Performance of p-Type PdO by Modulating the Conduction Model

“…The X-ray diffraction (XRD) patterns of Au@PdO NAs before and after treatment by NaBH 4 for different times are shown in Figure C. The diffraction peaks at 33.8, 42.1, 54.9, 60.4, 60.8, and 71.4° correspond to the (101), (110), (112), (103), (200), and (211) planes of the PdO shell, , and the remaining four characteristic diffraction peaks correspond to the (111), (200), (220), and (311) planes of the Au core . After being reduced by NaBH 4 , a new characteristic diffraction peak at 40.1° appears, which should be assigned as the Pd (111) plane, and the peak becomes intensive along with the increase of the reduction time.…”

A comparison between two Pd‐Ni catalysts supported on two different supports toward Suzuki‐Miyaura coupling reaction

“…The peaks of palladium oxide appeared at 33.92° and 60.46° due to (101) and (200) planes, respectively (JCPDS card no. 43‐1024) …”