DocumentCode
2115034
Title
PH sensing based on thin film hydrogel coated silicon gratings
Author
Mudraboyina, Anil Kumar ; Markowski, Jan ; Sabarinathan, Jayshri
Author_Institution
Dept. of Electr. & Comput. Eng., Univ. of Western Ontario, London, ON, Canada
fYear
2010
fDate
1-4 Nov. 2010
Firstpage
1701
Lastpage
1705
Abstract
We demonstrate a pH sensor based on silicon gratings coated with thin film of hydrogels. The silicon gratings have optical sensitivities around 197nm/RIU in detecting refractive index change and 0.824nm per nanometer of thickness change of hydrogel on the surface of silicon gratings. Silicon gratings were silanized so that the hydrogel is chemically bound to its surface. Normal transmission measurement shows the red shift of 155nm in resonant peak for a thin film coating of 187.9nm of hydrogel over them.
Keywords
coatings; diffraction gratings; electrochemical sensors; elemental semiconductors; hydrogels; refractive index; thin films; Si; hydrogels; pH sensor; refractive index; silicon gratings; thin film coating; wavelength 155 nm; wavelength 187.9 nm;
fLanguage
English
Publisher
ieee
Conference_Titel
Sensors, 2010 IEEE
Conference_Location
Kona, HI
ISSN
1930-0395
Print_ISBN
978-1-4244-8170-5
Electronic_ISBN
1930-0395
Type
conf
DOI
10.1109/ICSENS.2010.5689921
Filename
5689921
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