Multilayered assemblies composed of brilliant yellow and poly(allylamine) for an optical pH sensor.

Yuya Egawa, Ryosuke Hayashida, Jun-ichi Anzai

Index: Anal. Sci. 22(8) , 1117-9, (2006)

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Abstract

Multilayered thin films containing poly(allylamine) (PAA) and brilliant yellow (BY) were prepared on a quartz slide by a layer-by-layer (LBL) deposition technique. The UV-visible spectra of the PAA/BY films were sufficiently changed depending upon the pH value of the solution in which the film was immersed. The response of the PAA/BY films was very fast (within a second) upon pH change from 9.0 to 5.0, while the response time was ca. 100 s upon pH change from 5.0 to 9.0.