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Plastic optical fber (POF)
a) Normalized absorbance (%)
750 700 650
600 550 500
b) Normalized absorbance (%)
760 740 720 700 680 820 800 780 660
The researchers added raw CNTs
to a sulfuric acid solution, creating
“functionalized” CNTs with differing
amounts of carboxyl (COOH) molecules attached. The CNTs were then
drop-cast onto the unclad fiber region
and first heated to
70°C in the oven
for 2 h, then dried
at room temperature for 24 h.
For the GO-
GO was first dis-
persed in deion-
ized water and
the unclad fiber
region and cured
in a similar fashion
to the fiber ends
with CNTs. The
researchers used a scanning electron
microscope (SEM) to make sure
the CNTs and GO were success-
fully deposited on the fiber sections.
In addition, energy-dispersive x-ray
(EDX) analysis ensured the presence
FIGURE 2. Normalized absorption
spectra for ethanol in deionized water were
obtained for CNT-based (a) and GO-based
(b) fiber sensors.
FIGURE 1. A plastic optical fiber has a section stripped of cladding
and coated with either carbon nanotubes (CNTs) or graphene oxide
(GO) to serve as an ethanol sensor. Light from a halogen source passes
through the fiber; a spectrophotometer at the other end of the fiber
measures absorbance as a function of ethanol concentration.