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
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;
Conference_Titel :
Sensors, 2010 IEEE
Conference_Location :
Kona, HI
Print_ISBN :
978-1-4244-8170-5
Electronic_ISBN :
1930-0395
DOI :
10.1109/ICSENS.2010.5689921
