Next Article in Journal
Synthetic and Bio-Artificial Tactile Sensing: A Review
Previous Article in Journal
Human Behavior Cognition Using Smartphone Sensors
Article Menu

Export Article

Open AccessArticle
Sensors 2013, 13(2), 1425-1434; doi:10.3390/s130201425

Fiber Optic pH Sensor with Self-Assembled Polymer Multilayer Nanocoatings

Institute of Optoelectronic Technology, China Jiliang University, Hangzhou 310018, China
Department of Electrical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
Department of Electronics, Carleton University, Ottawa, ON K1S 5B6, Canada
Author to whom correspondence should be addressed.
Received: 7 December 2012 / Revised: 16 January 2013 / Accepted: 21 January 2013 / Published: 24 January 2013
(This article belongs to the Section Chemical Sensors)
View Full-Text   |   Download PDF [962 KB, 21 June 2014; original version 21 June 2014]   |  


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). View Full-Text
Keywords: fiber-optic sensor; layer-by-layer self-assembly; multilayer film; pH sensor; tilted fiber Bragg grating fiber-optic sensor; layer-by-layer self-assembly; multilayer film; pH sensor; tilted fiber Bragg grating

This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Shao, L.-Y.; Yin, M.-J.; Tam, H.-Y.; Albert, J. Fiber Optic pH Sensor with Self-Assembled Polymer Multilayer Nanocoatings. Sensors 2013, 13, 1425-1434.

Show more citation formats Show less citations formats

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Sensors EISSN 1424-8220 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top