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Resistive Hydrogen Sensors Based on Nanostructured Metals and Metal Alloys

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Hydrogen (H2), as a renewable energy source, has numerous applications such as chemical production, fuel cell technology, rocket engines, fuel for cars etc. The detection of H2 is so important in safety issue due to the flammable and explosive properties of H2 gas, in a H2 source for leak detection and in H2 production process because of real-time quantitative analysis of production. This paper reviews resistive type H2 sensor based on palladium (Pd), platinum (Pt) and their alloy nanostructures in the forms of thin films, nanoporous films, nanowires, nanoparticles, nanotubes, etc. The sensing mechanism of the nanostructured Pd and Pt resistive sensor is discussed in separated section. Nanostructured Pd sensors show a decrease or an increase in their resistance towards H2 gas depending on continuity of the nanostructure and will be examined in two parts: discontinuous (nano-gap based) and continuous Pd and Pd alloy nanostructure sensors. On the contrary to Pd nanostructure sensor, nanostructured Pt sensors require oxygen (O2) to operate. There are limited numbers of publications about nanostructured Pt and Pt alloy sensors, so further investigation are needed to well understand sensing mechanism of the Pt sensors.
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Keywords: NANOPARTICLES; NANOPOROUS; NANOTUBES; NANOWIRES; PALLADIUM; PLATINUM; RESISTIVE HYDROGEN SENSOR; THIN FILM

Document Type: Research Article

Publication date: August 1, 2013

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  • Nanoscience and Nanotechnology Letters (NNL) is a multidisciplinary peer-reviewed journal consolidating nanoscale research activities in all disciplines of science, engineering and medicine into a single and unique reference source. NNL provides the means for scientists, engineers, medical experts and technocrats to publish original short research articles as communications/letters of important new scientific and technological findings, encompassing the fundamental and applied research in all disciplines of the physical sciences, engineering and medicine.
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