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Opto-chemical sensor system for the detection of H2 and hydrocarbons based on InGaN/GaN nanowires
- Source :
- Sensors and Actuators B: Chemical. 173:120-126
- Publication Year :
- 2012
- Publisher :
- Elsevier BV, 2012.
-
Abstract
- We report on an all-optical sensor system that employs InGaN/GaN nanowires (NWs) as opto-chemical transducers. The NWs, grown by plasma-assisted molecular beam epitaxy on low-resistivity n-type Si (1 1 1) substrates, exhibit an efficient room-temperature photoluminescence (PL) that persists up to about 200 °C. After deposition of a thin (5 nm) catalytic Pt-film onto the NWs the PL intensity rises when the NWs are exposed to small concentrations of hydrogen and hydrocarbons. The gas response of the NWs was analyzed using an integrated sensor system with fiber-coupled excitation from a GaN-based power LED emitting at 365 nm and a fiber coupled photo multiplier tube for detection. With this setup, H2 concentrations as low as 200 ppb and C2H2 concentrations as low as 5 ppm could be detected when the transducers were operated at temperatures around 80 °C. This opto-chemical transducer principle is best suited for safety-critical applications where a reliable media separation is required.
- Subjects :
- Photoluminescence
Materials science
Hydrogen
Nanowire
chemistry.chemical_element
02 engineering and technology
01 natural sciences
7. Clean energy
Nanosensor
0103 physical sciences
Materials Chemistry
Electrical and Electronic Engineering
Instrumentation
Deposition (law)
010302 applied physics
business.industry
Metals and Alloys
021001 nanoscience & nanotechnology
Condensed Matter Physics
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
Transducer
chemistry
Optoelectronics
0210 nano-technology
business
Excitation
Molecular beam epitaxy
Subjects
Details
- ISSN :
- 09254005
- Volume :
- 173
- Database :
- OpenAIRE
- Journal :
- Sensors and Actuators B: Chemical
- Accession number :
- edsair.doi...........fa16d3d4e9891fe52d76348387ca1fcd