Immobilization of humic acid in nanostructured layer-by-layer films for sensing applications

被引：70

作者：

Crespilho, FN

Zucolotto, V

Siqueira, JR

Constantino, CJL

Nart, FC

Oliveira, ON

机构：

[1] Univ Sao Paulo, IFSC, BR-13560970 Sao Carlos, SP, Brazil

[2] Univ Sao Paulo, IQSC, BR-13560970 Sao Carlos, SP, Brazil

[3] Univ Estadual Paulista, FCT, BR-19060900 Presidente Prudente, SP, Brazil

来源：

ENVIRONMENTAL SCIENCE & TECHNOLOGY | 2005年 / 39卷 / 14期

关键词：

D O I：

10.1021/es050552n

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

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.

引用

页码：5385 / 5389

页数：5

共 35 条

[1] Retention of Co(II), Ni(II), and Cu(II) on a purified brown humic acid. Modeling and characterization of the sorption process [J].