期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 228, 期 -, 页码 573-580出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2016.01.058
关键词
Long period grating (LPG); Optical fiber; Porphyrin; Self-assembly; Ammonia; Refractive index
资金
- MEXT
- UK Engineering and Physical Sciences Research Council Platform Grant [EP/H02252X/1]
- [EP/L010437/1]
- EPSRC [EP/L010437/1, EP/H02252X/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/L010437/1] Funding Source: researchfish
In this study, the ability of a long period grating (LPG) optical fiber sensor coated with a multilayer film of poly(diallyldimethyammonium chloride) (PDDA) and tetrakis(4-sulfophenyl)porphine (TSPP) to detect ammonia gas was demonstrated. The nano-assembled thin film was prepared using a layer-by-layer deposition technique. This combination of an LPG and TSPP could allow highly sensitive optical sensors that specifically bind ammonia to be fabricated. An LPG with a period of 100 pin and a PDDA/TSPP coating produced by depositing fifteen layers afforded a limit of detection of 0.67 ppm for ammonia gas. TSPP molecules in the film acted as ammonia receptors because the TSPP morphologically changed from J- or H- aggregates to free base monomers when it was deprotonated by being exposed to ammonia. Interestingly, HC1 vapor could be used to increase the relative amount off-aggregation in the TSPP and to restore the sensor response. The reversibility of the morphological change in the TSPP allowed reversible changes to occur in the properties of the coating, including the refractive index, film thickness and density, and electrostatic interactions; these influenced the transmission spectrum of the LPG. (C) 2016 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据