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Ultra-Wide-Range Electrochemical Sensing Using Continuous Electrospun Carbon Nanofibers with High Densities of States
journal contribution
posted on 2014-03-12, 00:00 authored by Xianwen Mao, Xiaoqing Yang, Gregory C. Rutledge, T. Alan HattonCarbon-based sensors for wide-range
electrochemical detection of
redox-active chemical and biological molecules were fabricated by
the electrospinning of polyacrylonitrile fibers directly onto a polyacrylonitrile-coated
substrate followed by carbonization at 1200 °C. The resulting
electrospun carbon nanofibers (ECNFs) were firmly attached to the
substrate with good mesh integrity and had high densities of electronic
states (DOS), which was achieved without need for further modifications
or the use of any additives. The mass of ECNFs deposited, and thus
the electroactive surface area (ESA) of the sensor, was adjusted by
varying the electrospinning deposition time, thereby enabling the
systematic manipulation of the dynamic range of the sensor. A standard
redox probe (Fe(CN)63–/4–) was
used to demonstrate that the ECNF sensor exhibits strong electrocatalytic
activity without current saturation at high analyte concentrations.
Dopamine was used as a model analyte to evaluate the sensor performance;
we find that the ECNF device exhibits a dynamic range ∼105 greater than that of many existing carbon-based sensors.
The ECNF sensors exhibited excellent sensitivity, selectivity, stability,
and reproducibility for dopamine detection.
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ECNF device exhibitsECNF sensor exhibitsHigh Densitiespolyacrylonitrile fibersanalyte concentrationselectrospinning deposition timeelectrospun carbon nanofibersmesh integrityDOSdopamine detectionredox probeContinuous Electrospun Carbon Nanofibersmodel analyteelectrocatalytic activityESAelectroactive surface areasensor performanceECNF sensors
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