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Article Dans Une Revue Materials Chemistry and Physics Année : 2017

Determination of the extinction coefficient of “polydopamine” films obtained by using NaIO4 as the oxidant

Vincent Ball

Résumé

Understanding the molecular origin of the broadband optical absorption spectrum of eumelanin in solution remains a challenging task both from an experimental and a theoretical point of view. Eumelanin like materials can now be deposited on solid surfaces from dopamine solutions in oxidizing conditions allowing to easily functionalize the surface of almost all materials. The optical spectra of those “polydopamine” (PDA) films are close to the spectra of eumelanin but not identical. This article is a first attempt to quantify the optical absorption coefficient of PDA films which is made complicated by the uncertainty due to the need to know the density of this material. Using dissolved NaIO4 as the oxidant, at 0.5, 1 or 10 mM, the film thickness versus time does superimpose with the absorbance versus time curves suggesting intrinsic film homogeneity and allowing to calculate the product of the extinction coefficient by the concentration of PDA in the film.

Domaines

Matériaux
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Dates et versions

hal-03435865 , version 1 (18-11-2021)

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Citer

Vincent Ball. Determination of the extinction coefficient of “polydopamine” films obtained by using NaIO4 as the oxidant. Materials Chemistry and Physics, 2017, 186, pp.546-551. ⟨10.1016/j.matchemphys.2016.11.035⟩. ⟨hal-03435865⟩
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