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Internally Referenced Ammonia Sensor Based on an Electrochemically Prepared Porous SiO 2 Photonic Crystal
Author(s) -
King B. H.,
Gramada A.,
Link J. R.,
Sailor M. J.
Publication year - 2007
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.200602860
Subject(s) - bromothymol blue , materials science , porous silicon , absorbance , photonic crystal , optoelectronics , ammonia , crystal (programming language) , reflectivity , optics , silicon , analytical chemistry (journal) , organic chemistry , chemistry , physics , computer science , programming language
An oxidized porous silicon photonic crystal possessing two reflectance peaks is infused with bromothymol blue, yielding a pH‐responsive ammonia vapor sensor. One reflectance peak overlaps the absorbance band of the deprotonated dye while the other appears in a “clear” spectral region. Simultaneous monitoring of both reflectance peaks corrects for large changes in probe light intensity.