Enhanced Stability and Re-usability of the Optical Sensor for pH Monitoring Using a Layer-by-layer Deposition Technique

Nahid Raoufi, Frederic Surre, Muttukrishnan Rajarajan, Tong Sun, Kenneth T. V. Grattan

Abstract

Stable and reliable pH optical sensor is important for many industrial applications. The layer-by-layer deposition technique is a simple and versatile method used to deposit a sensitive thin film on such an optical fibre-based device but creating a coating which can often be destroyed in use in highly acid or alkali solutions. It is thus important to create stable and durable sensors for operation under these extreme environments. The main aim of this study has been to prepare a number of such sensors and compare the performance of three different stabilization approaches used for the development of an effective wavelength-dependent pHsensitive optical sensor. Techniques such as employing heat treatment, the deposition of two layers of a PAH/SiO2 thin film and the deposition of two layers APTMS/SiO2 as topping layers have been studied to determine the optimum approach to creating a desirable sensor – one yielding the same value of peak wavelength for a measurement of a known value of pH and to do so repeatedly. An improvement in performance and in shelf-life, stability and re-usability of the sensor has been achieved by the addition of two bilayers of APTMS/SiO2 in the work carried out and the results of the investigation undertaken are reported.

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Paper Citation


in Harvard Style

Raoufi N., Surre F., Rajarajan M., Sun T. and Grattan K. (2015). Enhanced Stability and Re-usability of the Optical Sensor for pH Monitoring Using a Layer-by-layer Deposition Technique . In Proceedings of the 3rd International Conference on Photonics, Optics and Laser Technology - Volume 1: OSENS, (PHOTOPTICS 2015) ISBN 978-989-758-092-5, pages 156-167. DOI: 10.5220/0005432401560167


in Bibtex Style

@conference{osens15,
author={Nahid Raoufi and Frederic Surre and Muttukrishnan Rajarajan and Tong Sun and Kenneth T. V. Grattan},
title={Enhanced Stability and Re-usability of the Optical Sensor for pH Monitoring Using a Layer-by-layer Deposition Technique},
booktitle={Proceedings of the 3rd International Conference on Photonics, Optics and Laser Technology - Volume 1: OSENS, (PHOTOPTICS 2015)},
year={2015},
pages={156-167},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0005432401560167},
isbn={978-989-758-092-5},
}


in EndNote Style

TY - CONF
JO - Proceedings of the 3rd International Conference on Photonics, Optics and Laser Technology - Volume 1: OSENS, (PHOTOPTICS 2015)
TI - Enhanced Stability and Re-usability of the Optical Sensor for pH Monitoring Using a Layer-by-layer Deposition Technique
SN - 978-989-758-092-5
AU - Raoufi N.
AU - Surre F.
AU - Rajarajan M.
AU - Sun T.
AU - Grattan K.
PY - 2015
SP - 156
EP - 167
DO - 10.5220/0005432401560167