Vibrational analysis of H2 and NH3 adsorption on Pt/SiO2 and Ir/SiO2 model sensors
Paper in proceeding, 2007
The sensing mechanism of metal insulator silicon-based field effect transistor devices (MISFET) for H2 and NH3 detection has been studied for Pt/SiO2 and Ir/SiO2 model sensors with in situ infrared spectroscopy and density functional theory calculations (DFT). The spectroscopy experiments showed reversible formation of isolated OH groups on the silica surface upon H2 or NH3 exposure. In addition, an intense broad band was observed around 3270 cm(-1). Supported by the calculations, this band was assigned to perturbed OH groups on the silica surface. These results strongly indicate that dissociation and spill-over of hydrogen occurs during exposure of Pt/SiO2 and Ir/SiO2 to H2 or NH3. These results indicate a common sensing mechanism for hydrogen and ammonia.
Hydrogen
Ammonia
Sensor
Author
Mikaela Wallin
Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry
Competence Centre for Catalysis (KCK)
Marielle Byberg
Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry
Competence Centre for Catalysis (KCK)
Henrik Grönbeck
Chalmers, Applied Physics, Chemical Physics
Competence Centre for Catalysis (KCK)
Magnus Skoglundh
Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry
Competence Centre for Catalysis (KCK)
Mats Eriksson
Linköping University
Anita Lloyd Spetz
Linköping University
2007 IEEE Sensors
1930-0395 (ISSN)
Vol. 1-3 1315-1317978-1-4244-1261-7 (ISBN)
Driving Forces
Sustainable development
Areas of Advance
Nanoscience and Nanotechnology
Transport
Energy
Materials Science
Subject Categories
Analytical Chemistry
Atom and Molecular Physics and Optics
Materials Chemistry
Other Chemical Engineering
DOI
10.1109/ICSENS.2007.4388652
ISBN
978-1-4244-1261-7