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Merck

Photonic crystal fiber for layer-by-layer assembly and measurements of polyelectrolyte thin films.

Optics letters (2012-10-18)
Fei Tian, Jiri Kanka, Svetlana A Sukhishvili, Henry Du
RESUMO

The cladding air channels of an endlessly single-mode photonic crystal fiber (PCF) and the high-index sensitivity of its long-period gratings (LPG) inscribed by CO(2) laser have been exploited to deposit poly(vinyl pyrrolidone) (PVPON)/poly(methacrylic acid) (PMAA) polyelectrolyte thin films via layer-by-layer assembly (LbL) and to measure the deposition process. We show that LbL can be controllably carried out within the axially aligned air channels. PCF-LPG is highly sensitive to the LbL process as reflected by ~1.625 nm shift in the resonance wavelength per polyelectrolyte layer incorporated. PCF-LPG is also very robust for in situ monitoring of the release of PVPON from cross-linked polyelectrolytes, which results in the formation of pH-responsive PMAA hydrogel. PCF-LPG containing the hydrogel exhibits well-behaved response to changes in solution pH over 2 to 7.5. We demonstrate that PCF-LPG is 2 orders of magnitude more sensitive than its traditional all-solid counterpart through parallel investigation.

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Sigma-Aldrich
Poly(methacrylic acid, sodium salt) solution, average Mn ~5,400, average Mw ~9,500 by GPC, 30 wt. % in H2O
Sigma-Aldrich
Poly(methacrylic acid, sodium salt) solution, average Mw 4,000-6,000, 40 wt. % in H2O