Fiber Optic pH Sensor with Self-Assembled Polymer Multilayer Nanocoatings
Open Access
- 23 January 2013
- Vol. 13 (2), 1425-1434
- https://doi.org/10.3390/s130201425
Abstract
A fiber-optic pH sensor based on a tilted fiber Bragg grating (TFBG) with electrostatic self-assembly multilayer sensing film is presented. The pH sensitive polymeric film, poly(diallyldimethylammonium chloride) (PDDA) and poly(acrylic acid) (PAA) was deposited on the circumference of the TFBG with the layer-by-layer (LbL) electrostatic self-assembly technique. The PDDA/PAA film exhibits a reduction in refractive index by swelling in different pH solutions. This effect results in wavelength shifts and transmission changes in the spectrum of the TFBG. The peak amplitude of the dominant spectral fringes over a certain window of the transmission spectrum, obtained by FFT analysis, has a near-linear pH sensitivity of 117 arbitrary unit (a.u.)/pH unit and an accuracy of ±1 a.u. (in the range of pH 4.66 to pH 6.02). The thickness and surface morphology of the sensing multilayer film were characterized to investigate their effects on the sensor’s performance. The dynamic response of the sensor also has been studied (10 s rise time and 18 s fall time for a sensor with six bilayers of PDDA/PAA).This publication has 23 references indexed in Scilit:
- Highly sensitive and selective fiber-optic modal interferometric sensor for detecting trace mercury ion in aqueous solutionAnalytical Methods, 2012
- Highly sensitive and fast responsive fiber-optic modal interferometric pH sensor based on polyelectrolyte complex and polyelectrolyte self-assembled nanocoatingAnalytical and Bioanalytical Chemistry, 2011
- Polyelectrolyte layer-by-layer self-assembly at vibration condition and the pervaporation performance of assembly multilayer films in dehydration of isopropanolJournal of Membrane Science, 2010
- Soil Calcium and pH Monitoring Sensor SystemJournal of Agricultural and Food Chemistry, 2007
- Mechanism of the pH-Induced Discontinuous Swelling/Deswelling Transitions of Poly(allylamine hydrochloride)-Containing Polyelectrolyte Multilayer FilmsMacromolecules, 2005
- Form and Function in Multilayer Assembly: New Applications at the NanoscaleAdvanced Materials, 2004
- Fuzzy Nanoassemblies: Toward Layered Polymeric MulticompositesScience, 1997
- Distributed pH and water detection using fiber-optic sensors and hydrogelsJournal of Lightwave Technology, 1995
- Optical pH sensor based on the chemical modification of a porous polymer filmAnalytical Chemistry, 1988
- Fluorescence sensor for monitoring ionic strength and physiological pH valuesSensors and Actuators, 1986