Immobilization of humic acid in nanostructured layer-by-layer films for sensing applications
Immobilization of humic acid in nanostructured layer-by-layer films for sensing applications
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DOI：
10.1021/es050552n
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发表时间：
2005-07-15
影响因子：
11.4
通讯作者：
Oliveira, ON
中科院分区：
文献类型：
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作者：
Crespilho, FN;Zucolotto, V;Oliveira, ON
腐殖酸（HA），天然存在的生物大分子，被纳入到纳米结构的聚合物膜使用的层层（LbL）的技术，其中HA层交替与层的聚（烯丙胺盐酸盐）（PAH）。原子力显微镜（AFM）显示非常光滑的薄膜，平均粗糙度从0.89到1.19 nm的薄膜含有5和15 PAH/HA双层，分别。该膜显示出电活性，在约100 nm处仅存在一个还原峰。0.675 V（相对于Ag/AgCl）。这种定义明确的电活性允许薄膜被用作高灵敏度的农药传感器，检测浓度低至10（-9）mol L-1的溶液中的五氯苯酚（PCP）。
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.