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Interdigitated Pt-GaN Schottky interfaces for high-temperature soot-particulate sensing
- Source :
- Applied Surface Science. 368:104-109
- Publication Year :
- 2016
- Publisher :
- Elsevier BV, 2016.
-
Abstract
- A microscale soot-particulate sensor using interdigitated platinum-gallium nitride (Pt-GaN) Schottky interfaces was developed to monitor fine soot particles within high-temperature environments (e.g., combustion exhausts and flues). Upon exposure to soot particles (30 to 50 nm in diameter) from an experimental chimney, an increased current (∼43.6%) is observed through the back-to-back Schottky contact to n-type GaN. This is attributed to a reduction in the effective Schottky barrier height (SBH) of ∼10 meV due to the electric field from the charged soot particles in the depletion region and exposed GaN surface. Furthermore, the microfabricated sensor was shown to recover sensitivity and regenerate the sensing response (∼11 meV SBH reduction) after exposure to temperature as high as 550 °C. This study supports the feasibility of a simple and reliable soot sensor to meet the increasing market demand for particulate matter sensing in harsh environments.
- Subjects :
- Materials science
Schottky barrier
General Physics and Astronomy
Field effect
Nanotechnology
Gallium nitride
02 engineering and technology
Nitride
medicine.disease_cause
01 natural sciences
chemistry.chemical_compound
Depletion region
medicine
business.industry
010401 analytical chemistry
Schottky diode
Surfaces and Interfaces
General Chemistry
Particulates
021001 nanoscience & nanotechnology
Condensed Matter Physics
Soot
0104 chemical sciences
Surfaces, Coatings and Films
chemistry
Optoelectronics
0210 nano-technology
business
Subjects
Details
- ISSN :
- 01694332
- Volume :
- 368
- Database :
- OpenAIRE
- Journal :
- Applied Surface Science
- Accession number :
- edsair.doi...........5a81361bb5b0a2a6f6e834262978a1df