Fabrication of silver nanoparticles/polyaniline composite thin films using Layer-by-Layer self-assembly technique for ammonia sensing
Fabrication of silver nanoparticles/polyaniline composite thin films using Layer-by-Layer self-assembly technique for ammonia sensing
复制标题
DOI：
10.1016/j.colsurfa.2014.11.019
复制
发表时间：
2015-02-20
影响因子：
5.2
通讯作者：
Popanyasak, Jittaporn
中科院分区：
文献类型：
--
作者：
Detsri, Ekarat;Popanyasak, Jittaporn
本研究利用层层沉积技术制备了银纳米粒子与聚苯胺的复合薄膜。多层复合薄膜是由阴离子和阳离子聚电解质交替沉积而成。以水溶性聚苯胺为稳定剂，通过化学还原银离子制备阴离子型聚苯胺，形成阴离子型银纳米粒子/聚苯胺复合溶液。在苯乙烯磺酸-马来酸共聚物（CoPSS）存在下，通过苯胺单体的界面聚合制备了水溶性聚苯胺。用阴离子水溶性聚苯胺稳定的银纳米粒子然后与阳离子聚（二烯丙基二甲基氯化铵）（PDADMAC）沉积在薄膜中，并表征其光学性质。薄膜的光学性质通过紫外-可见光谱测量。用原子力显微镜（AFM）对薄膜的表面进行了测量。由于这些膜将被用作氨检测的传感器，因此针对各种氨浓度评价膜的光学性质的变化。当暴露于氨时，可以看到从橙红色到黄色的强烈颜色变化。这种银纳米粒子/聚苯胺复合薄膜具有快速变色的特性，可用于工业领域的氨传感。(C)2014爱思唯尔有限公司版权所有。
In this study, the Layer-by-Layer (LbL) deposition technique was used to prepare composite thin films of silver nanoparticles and polyaniline. The multilayer composite thin films were constructed by alternate deposition of anionic and cationic polyelectrolytes. Anionic polyelectrolyte was prepared by chemical reduction of silver ion using water soluble polyaniline as the stabilizing agent to form anionic silver nanoparticles/polyaniline composite solution. The water soluble polyaniline was prepared by interfacial polymerization of aniline monomer in presence of poly(styrene sulfonic acid co maleic acid), (CoPSS). Silver nanoparticles stabilized with anionic water soluble polyaniline were then deposited in thin film with cationic poly(diallyldimethylammonium chloride), (PDADMAC) and characterized for their optical properties. The optical properties of thin films were measured by UV-visible spectroscopy. The surface of the films was measured by atomic force microscopy (AFM). As these films are to be used as sensor for the ammonia detection, the changes in optical properties of the films were evaluated for various ammonia concentration. A strong color shift from orange-red to yellow was visible when exposed to ammonia. These silver nanoparticles/polyaniline composite thin films displayed fast color change and could be used for ammonia sensing in industrial section. (C) 2014 Elsevier B.V. All rights reserved.