From Event: SPIE Commercial + Scientific Sensing and Imaging, 2017
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.
Fan Yang, Svetlana A. Sukhishvili, Henry Du, and Fei Tian, "In-situ study of pH-responsiveness of polyelectrolytes using long-period fiber gratings (Conference Presentation)," Proc. SPIE 10208, Fiber Optic Sensors and Applications XIV, 102080S (Presented at SPIE Commercial + Scientific Sensing and Imaging: April 12, 2017; Published: 21 June 2017); https://doi.org/10.1117/12.2262852.5460418207001.
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