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Proceedings Paper

In-situ study of pH-responsiveness of polyelectrolytes using long-period fiber gratings (Conference Presentation)

Paper Abstract

Solution pH is one of the most critical parameters for chemical reactions which are important for clinical, environmental or manufacturing applications. The integration of pH-responsive polyelectrolyte via layer-by-layer assembly (LbL) with long period grating (LPG) has enabled the monitoring of the pH in real time with high sensitivity at minimized volume. We show that the pH-responsive profile of the LbL/LPG platform can be tailored to specific needs depending on the deposition parameters during the LbL process. By choosing different deposition pH, weak polyelectrolytes showed either linear responsiveness or responsiveness with a reversal point at pH 4.5 over the pH range of 2-11. The most sensitive area was related to both the pKa of the chosen polyelectrolyte in the coating and the deposition pH during the LbL process. The study provides important guide to optimize and improve the sensitivity in specific pH range by selection of polyelectrolytes and/or deposition parameters. The LbL/LPG platform affords a powerful tool to study the mechanisms of the responsiveness and physiochemical properties of the polyelectrolytes.

Paper Details

Date Published: 21 June 2017
PDF: 1 pages
Proc. SPIE 10208, Fiber Optic Sensors and Applications XIV, 102080S (21 June 2017); doi: 10.1117/12.2262852
Show Author Affiliations
Fan Yang, Stevens Institute of Technology (United States)
Svetlana A. Sukhishvili, Texas A&M Univ. (United States)
Henry Du, Stevens Institute of Technology (United States)
Fei Tian, Stevens Institute of Technology (United States)

Published in SPIE Proceedings Vol. 10208:
Fiber Optic Sensors and Applications XIV
Christopher S. Baldwin; Gary Pickrell; Henry H. Du, Editor(s)

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