Long Period Grating Optical Fibre Sensor With A Molecularly Imprinted TiO2 Nanothin Film | 18712
Journal of Analytical & Bioanalytical Techniques
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Molecular imprinting (MI), which was the first challenge by Dickey in 1949, has become a routine technique in materials
and analytical chemistry. Inorganic materials for MI have been broadly approached because of their high stability and
durability. In this study, a porphyrin molecule, tetrakis-(N-methyl-piridinium-4-yl)porphine (TMPyP), was used as a template
hybrid film was synthesized on a long period grating (LPG) optical fibre via liquid phase deposition (LPD). This LPG
fibre coated with a molecularly imprinted TiO
thin film provides several advantages in terms of high refractive index (RI) of
, high porosity, uniform surface etc.
A 97 μm period LPG was written on a single mode, photosensitive fibre with a cut-off wavelength of 627 nm (Fibercore
/TMPyP composite film was deposited on the fibre via LPD for 4.5 h.
Comparing the transmission spectrum of the LPG sensor modified with a TiO
/TMPyP film before and after heat treatment,
shows that the RI of the film was improved at 60
C under highly humid conditions. The template was removed from the coating
by submerging the LPG sensor into an aqueous solution of 0.1 M hydrochloric acid. Comparisons of rebinding the template
into the matrix with and without prior treatment of 1 wt% ammonia solution to the LPG were carried out. The transmission
spectra of the LPG sensor as TMPyP and mellitic acid were rebound to the imprinted film. The TMPyP-imprinted TiO
showed higher selective and sensitive binding towards the template molecule than the non-imprinted pure TiO
Tao Wang received his bachelor degree in 2012 from the University of Kitakyushu (Japan) and now he is a PhD course student in the same University. His research
interests include the optical fiber based chemical sensor for biomedical applications.
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