City Research Online

Abstract

In this work the development of two different optical fibre-based chemical sensors (OFCSs), applied to better environmental monitoring, is discussed and results on the design and performance of these sensors are presented. Firstly, a graphene oxide (GO)-coated Long Period Grating (LPG)-based device, sensitive to the refractive index (RI) change caused by ambient humidity levels over the important range of 60% RH to 95% RH used for environmental monitoring, is discussed. Secondly, an OFCS device has been developed for the detection of Pb2+ ion. It was achieved by dip coating ~50 nm gold nanoparticles (Au-NP) on a multi-mode optical fibre and subsequently functionalizing with 1-Mercaptoundecanoic acid, to make it selective to Pb2+ ions. The Pb2+ ion sensor developed shows a sensitivity of 2.8 ×10-4 nm/µM and response time of 30s. The results obtained from these two important chemical sensor schemes highlight the importance of the use of various nanomaterials in creating novel OFCS, allowing tailoring of their performance to several environmental monitoring applications. The chemical synthesis and the functionalization of coatings such as GO and Au-NP on optical fibre paves the ways for novel OFCS device that could have important commercial potential for a wide range of applications.

Publication Type:	Article
Publisher Keywords:	Optical fibre, Plasmonics, Long-Period Grating, Graphene Oxide, Gold Nanoparticles
Subjects:	Q Science > QC Physics Q Science > QD Chemistry T Technology > TK Electrical engineering. Electronics Nuclear engineering
Departments:	School of Science & Technology > Engineering

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