ma400113m_si_001.pdf (1.56 MB)
Rigid versus Flexible Ligands on Carbon Nanotubes for the Enhanced Sensitivity of Cobalt Ions
journal contribution
posted on 2016-02-19, 21:34 authored by Pingping Gou, Nadine D. Kraut, Ian Matthew Feigel, Alexander StarCarbon nanotubes have shown great promise in the fabrication
of
ultracompact and highly sensitive chemical and biological sensors.
Additional chemical functionalization schemes can controllably improve
selectivity of the carbon nanotube-based sensors; however, the exact
transduction mechanism is still under debate. In this article we detail
the synthesis and selective response of single-walled carbon nanotubes
(SWNTs) functionalized with polyazomethine (PAM) polymer toward the
application of a specific trace metal ion detector. The response of
the polymer system was compared to shape persistent macrocycle (MAC)
comprised of identical ion coordination ligands. While ion detection
with rigid MAC/SWNT chemiresistor was comparable to bare SWNT, flexible
PAM offers significant SWNT signal amplification, allowing for picomolar
detection of Co2+ ions with both selectivity and a fast
response. We hypothesized that rearrangement of the flexible PAM on
the SWNT network is a sensing mechanism which allows for ultrasensitive
detection of metal ions. The electron transfer and polymer rearrangement
on the SWNT were studied by a combination of optical spectroscopy
and electrical measurementsultimately allowing for a better
understanding of fundamental mechanisms that prompt device response.
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Keywords
transduction mechanismSWNT networkCobalt IonsCarbon nanotubesmetal ionsMACCarbon Nanotubespolymer rearrangementselectivitypolymer systemPAMFlexible Ligandssensordevice responseelectron transferSWNT signal amplificationtrace metal ion detectorion coordination ligandspicomolar detectionEnhanced Sensitivityion detectionAdditional chemical functionalization schemesultrasensitive detection
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