So as to covalently graft a chemical on a substrate, the GraftFast^TM process can be used; the only requirement is that the chemical has at least one aromatic primary amine. In this work, this simple and fast process is presently used to graft dyes that are pH sensitive on an optical fiber, thus creating a pH sensor called optode. The major asset of this grafting process is that the dye is covalently grafted on the fiber, resolving stability issues encountered with other techniques – like physical entrapment or electrostatic interactions. Two different dyes have been successfully grafted on gold lamellas (which are the reference substrates for the GraftFast^TM process), and an innovative experimental method to increase the thickness of the dye layer has been developed.

Date Published: 5 May 2015
PDF: 8 pages
Proc. SPIE 9506, Optical Sensors 2015, 950613 (5 May 2015); doi: 10.1117/12.2178505

Published in SPIE Proceedings Vol. 9506:
Optical Sensors 2015
Francesco Baldini; Jiri Homola; Robert A. Lieberman, Editor(s)