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Quantitative characterisation of conductive fibers by capacitive coupling
Analyst ( IF 4.2 ) Pub Date : 2017-10-17 00:00:00 , DOI: 10.1039/c7an00442g
Andres Ruland 1, 2, 3, 4, 5 , Rouhollah Jalili 6, 7, 8, 9, 10 , Attila J. Mozer 1, 2, 3, 4, 5 , Gordon G. Wallace 1, 2, 3, 4, 5
Affiliation  

This work presents a study on a capacitively coupled contactless conductivity detector (C4D) for micron-sized fibers. Following a previous report on the qualitative application of C4D for fibers, the present study provides a thorough analysis of the signal response to fiber conductivity. Using reduced graphene oxide (RGO) fibers, the detector response as a function of fiber length, cross-sectional area and resistance has been investigated. To study the effect of insulating coatings, Parylene-coated RGO fibers were also investigated. In addition, measurements were performed in different coupling environments, such as in a capillary tube or air. The analysis of the measured data allowed the determination of the C4D conductivity of various RGO fibers, and the correlation with contact methods through empirical relationships to be determined. It was found that the detection limit and sensitivity of resistance measurements are mainly dependent on the sensor design, and also on the fiber properties. The detection threshold can be defined as the ratio of the coupling impedance to fiber resistance. In our case, the detection limit was found for impedance ratios equal to 14. This limit sets a functioning mode in C4D for fibers, which may be used as an area or resistance detector for the impedance ratio above or below the detection threshold. A semi-log linear response of the fiber resistance to the voltage output was found for impedance ratios between 2.66 and 0.63. These impedance ratios may serve as a reference for designing C4D, depending on the fibers to be tested and the analytical information needed. In summary, we suggest that C4D has the capacity to emerge as a new characterisation tool for micron-sized fibers, due to its applicability to any conductive material, ease of use, and the contactless nature of the measurement.

中文翻译:

电容耦合对导电纤维的定量表征

这项工作提出了对用于微米级纤维的电容耦合非接触式电导率检测器(C4D)的研究。继先前有关C4D在纤维上的定性应用的报告之后,本研究提供了对纤维导电性信号响应的全面分析。使用还原的氧化石墨烯(RGO)纤维,研究了探测器响应随纤维长度,横截面积和电阻的变化。为了研究绝缘涂层的效果,还研究了聚对二甲苯涂层的RGO纤维。另外,测量是在不同的耦合环境下进行的,例如在毛细管或空气中。通过对测量数据的分析,可以确定各种RGO纤维的C4D电导率,并可以通过经验关系确定与接触方法的相关性。已经发现,电阻测量的检测极限和灵敏度主要取决于传感器的设计以及光纤的性能。可以将检测阈值定义为耦合阻抗与光纤电阻的比率。在我们的案例中,发现阻抗比等于14的检测极限。此极限在C4D中为光纤设置了功能模式,可用作阻抗比高于或低于检测阈值的区域或电阻检测器。当阻抗比在2.66和0.63之间时,发现光纤电阻对电压输出的半对数线性响应。根据要测试的光纤和所需的分析信息,这些阻抗比可以用作设计C4D的参考。总之,
更新日期:2017-11-09
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