Electrode potential-dependent colorimetric response of fluorescein-modified layer-by-layer films in the presence of hydrogen peroxide

Journal of Colloid and Interface Science
Munenari NagasakaJun-ichi Anzai

Abstract

Layer-by-layer (LbL) thin films composed of fluorescein-modified poly(allylamine) (F-PAH) and poly(styrenesulfonic acid) (PSS) were prepared on the surface of an indium-tin oxide (ITO) electrode and the electrode potential-dependent colorimetric response of the LbL films was studied in the presence of hydrogen peroxide (H(2)O(2)). The LbL films were prepared by an alternate deposition of F-PAH and PSS on the surface through an electrostatic force of attraction. The LbL films exhibited a UV-visible absorption band around 500 nm originating from fluorescein residues in the film and the intensity of the absorption band depended on the pH of the solution to which the LbL film is exposed. The absorbance of the film was higher at neutral pH than that in weakly acidic solutions. The intensity of the absorption band decreased when an electrode potential higher than 0.6 V was applied in the presence of H(2)O(2), while virtually no response was observed at lower electrode potential. The colorimetric response was suppressed in solutions with higher buffer capacity. The results were rationalized on the basis of the changes in local pH at the vicinity of the electrode surface, which in turn was induced by electrolysis of H(2)O(2) on the ele...Continue Reading

References

Jan 12, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Katsuhiko SatoJun-ichi Anzai
Mar 8, 2006·Langmuir : the ACS Journal of Surfaces and Colloids·Takio Noguchi, Jun-Ichi Anzai
May 3, 2008·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Mohammad Bagher GholivandAli Mohajeri
Jul 25, 2008·Journal of Colloid and Interface Science·Shigeru TomitaJun-ichi Anzai
Dec 17, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Tsz Kin TamEvgeny Katz

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Citations

Oct 3, 2017·Yakugaku zasshi : Journal of the Pharmaceutical Society of Japan·Kentaro Yoshida

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