ac0c01062_si_001.pdf (135.15 kB)
Electrochemical Long Period Fiber Grating Sensing for Electroactive Species
journal contribution
posted on 2020-07-04, 14:29 authored by Takuya Okazaki, Tatsuya Orii, Shin-Yinn Tan, Tomoaki Watanabe, Akira Taguchi, Faidz A. Rahman, Hideki KuramitzWe present an electrochemical
long period fiber grating (LPFG)
sensor for electroactive species with an optically transparent electrode.
The sensor was fabricated by coating indium tin oxide onto the surface
of LPFG using a polygonal barrel-sputtering method. LPFG was produced
by an electric arc-induced technique. The sensing is based on change
in the detection of electron density on the electrode surface during
potential application and its reduction by electrochemical redox of
analytes. Four typical electroactive species of methylene blue, hexaammineruthenium(III),
ferrocyanide, and ferrocenedimethanol were used to investigate the
sensor performance. The concentrations of analytes were determined
by the modulation of the potential as the change in transmittance
around the resonance band of LPFG. The sensitivity of the sensor,
particularly to methylene blue, was high, and the sensor responded
to a wide concentration range of 0.001 mM to 1 mM.