| Literature DB >> 16082970 |
Frank N Crespilho1, Valtencir Zucolotto, José R Siqueira, Carlos J L Constantino, Francisco C Nart, Osvaldo N Oliveira.
Abstract
Humic acids (HAs), naturally occurring biomacromolecules, were incorporated into nanostructured polymeric films using the layer-by-layer (LbL) technique, in which HA layers were alternated with layers of poly(allylamine hydrochloride) (PAH). Atomic force microscopy (AFM) revealed very smooth films, with mean roughness varying from 0.89 to 1.19 nm for films containing 5 and 15 PAH/HA bilayers, respectively. The films displayed electroactivity, with the presence of only one reduction peak at ca. 0.675 V (vs Ag/AgCl). Such a well-defined electroactivity allowed the films to be used as highly sensitive pesticide sensors, with detection of pentachlorophenol (PCP) in solutions at concentrations as low as 10(-9) mol L(-1).Entities:
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Year: 2005 PMID： 16082970 DOI： 10.1021/es050552n
Source DB: PubMed Journal: Environ Sci Technol ISSN： 0013-936X Impact factor: 9.028