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Optical fibre long period grating with a nanoporous coating formed from silica nanoparticles for ammonia sensing in water

机译:具有二氧化硅纳米颗粒形成的纳米孔涂层的光纤长周期光栅,用于水中的氨感测

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摘要

A fibre optic long period grating (LPG) with an nano-assembled mesoporous coating of alternate layers of poly(diallyldimethylammonium chloride) (PDDA) and SiO_2 nanospheres was used for the development of a highly sensitive fibre-optic chemical sensor. Sensor fabrication involves a 2-stage process: firstly, the deposition of the base mesoporous thin film (PDDA/SiO_2) over an LPG written in the optical fibre using a layer-by layer technique, followed by the infusion of a functional material into the porous film. The refractive index of the base mesoporous coating, determined at a wavelength of 633 nm using ellipsom-etry, was found to be 1.2. The infusion of the functional material into the coating resulted in a significant change in the RI of the coating, producing a dramatic change in the transmission spectrum of the LPG. The sensing mechanism exploited is based upon chemically induced desorption of the functional material from the mesoporous coating. The sensing of ammonia in aqueous solution was chosen as an example to demonstrate the sensing principle of the LPG sensor. The operation of the sensor was characterized using two functional materials, tetrakis-(4-sulfophenyl)porphine (TSPP) and polyacrylic acid (PAA). The device showed high sensitivity to ammonia with a response time less than 100 s and a limit of detection of 140 ppb when the TSPP infused (PDDA/SiO_2) film was employed as a sensitive element.
机译:光纤长周期光栅(LPG)具有聚二烯丙基二甲基氯化铵(PDDA)和SiO_2纳米球交替层的纳米组装中孔涂层,用于开发高灵敏度的光纤化学传感器。传感器的制造涉及两个阶段的过程:首先,使用逐层技术在写入光纤的LPG上沉积基础中孔薄膜(PDDA / SiO_2),然后将功能性材料注入到光纤中。多孔膜。发现使用椭圆体法在633nm的波长下测定的基础介孔涂层的折射率为1.2。将功能材料注入涂料中会导致涂料的RI发生显着变化,从而导致LPG的透射光谱发生巨大变化。所利用的感测机制是基于化学诱导的功能材料从介孔涂层中的解吸。以水溶液中氨的感测为例来说明LPG传感器的感测原理。使用两种功能材料,四-(4-磺基苯基)卟啉(TSPP)和聚丙烯酸(PAA)来表征传感器的操作。当将注入TSPP的(PDDA / SiO_2)膜用作敏感元件时,该设备对氨具有高灵敏度,响应时间小于100 s,检测极限为140 ppb。

著录项

  • 来源
    《Materials Chemistry and Physics》 |2012年第3期|784-792|共9页
  • 作者单位

    Graduate School of Environmental Engineering, the University of Kitakyushu, Kitakyushu, Japan;

    Graduate School of Environmental Engineering, the University of Kitakyushu, Kitakyushu, Japan;

    Graduate School of Environmental Engineering, the University of Kitakyushu, Kitakyushu, Japan;

    Graduate School of Environmental Engineering, the University of Kitakyushu, 1-1, Hibikino, Kitakyushu 808-0135, Japan;

    Department of Engineering Photonics, School of Engineering, Cranfield University, Cranfield, Bedford MK43 OAL, UK;

    Department of Engineering Photonics, School of Engineering, Cranfield University, Cranfield, Bedford MK43 OAL, UK;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    fibre-optic sensor; long period grating; nanoporous film; porphyrin; ammonia;

    机译:光纤传感器长周期光栅;纳米多孔膜卟啉氨;
  • 入库时间 2022-08-18 00:39:38

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