Vibrational analysis of H2 and NH3 adsorption on Pt/SiO2 and Ir/SiO2 model sensors
Paper i 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.
Sensor
Ammonia
Hydrogen
Författare
Mikaela Wallin
Chalmers, Kemi- och bioteknik, Teknisk ytkemi
Kompetenscentrum katalys (KCK)
Marielle Byberg
Kompetenscentrum katalys (KCK)
Chalmers, Kemi- och bioteknik, Teknisk ytkemi
Henrik Grönbeck
Chalmers, Teknisk fysik, Kemisk fysik
Kompetenscentrum katalys (KCK)
Magnus Skoglundh
Kompetenscentrum katalys (KCK)
Chalmers, Kemi- och bioteknik, Teknisk ytkemi
Mats Eriksson
Linkopings universitet
Anita Lloyd Spetz
Linkopings universitet
2007 IEEE Sensors
1930-0395 (ISSN)
Vol. 1-3 1315-1317978-1-4244-1261-7 (ISBN)
Drivkrafter
Hållbar utveckling
Styrkeområden
Nanovetenskap och nanoteknik
Transport
Energi
Materialvetenskap
Ämneskategorier (SSIF 2011)
Analytisk kemi
Atom- och molekylfysik och optik
Materialkemi
Annan kemiteknik
DOI
10.1109/ICSENS.2007.4388652
ISBN
978-1-4244-1261-7