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Quantitative characterisation of conductive fibers by capacitive coupling
Andres Ruland1, Rouhollah Jalili, Attila J Mozer
1ARC Centre of Excellence for Electromaterials Science (ACES), Intelligent Polymer Research Institute, AIIM Facility, Innovation Campus, University of Wollongong, NSW 2500, Australia. gwallace@uow.edu.au.
The Analyst
|November 10, 2017
Summary
A new capacitively coupled contactless conductivity detector (C4D) was developed for analyzing micron-sized fibers. This detector shows potential as a versatile characterization tool for conductive materials, offering ease of use and contactless measurements.
Area of Science:
- Materials Science
- Analytical Chemistry
- Electrical Engineering
Background:
- Contactless conductivity detection is crucial for characterizing micro-scale materials.
- Previous work demonstrated qualitative applications of C4D for fibers.
- Quantitative analysis of C4D response to fiber properties was lacking.
Purpose of the Study:
- To perform a thorough analysis of the signal response of a C4D to fiber conductivity.
- To investigate the influence of fiber properties and environmental factors on C4D measurements.
- To establish C4D as a potential characterization tool for micron-sized fibers.
Main Methods:
- Utilized reduced graphene oxide (RGO) fibers with varying lengths, cross-sectional areas, and resistances.
- Investigated the effect of insulating coatings (Parylene) on RGO fibers.
- Performed measurements in different coupling environments (capillary tube, air).
Main Results:
- Determined C4D conductivity of RGO fibers and correlated it with contact methods via empirical relationships.
- Established that detection limit and sensitivity depend on sensor design and fiber properties.
- Identified a detection threshold (impedance ratio of 14) and a semi-log linear response range for fiber resistance.
Conclusions:
- Capacitively coupled contactless conductivity detector (C4D) shows promise as a novel characterization tool for micron-sized conductive fibers.
- The detector's performance is influenced by sensor design, fiber properties, and measurement environment.
- C4D offers advantages such as applicability to various conductive materials, ease of use, and contactless measurement.
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