A thin-film pH sensor based on vibrational spectroscopy has been developed. The sensor was constructed by the immobilization of Congo Red at a base-hydrolyzed cellulose acetate film that had been coated onto a ZnSe internal reflection element. The protonation of the azo groups of Congo Red was monitored as a function of pH with infrared internal reflection spectroscopy. The response characteristics of this sensor demonstrate the potential utility of applying infrared spectroscopy to detect the response of thin film sensors. Opportunities to design sensors based on the molecular specificity of infrared spectroscopy are briefly discussed.

PDF Article

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
Login to access OSA Member Subscription