Electrical impedance properties of a nanoweb electrode embedded carbon nanotube for a bio-chemical sensor

Abstract

In this study, carbon nanotube (CNT) based nanoweb electrodes were fabricated and their electrical impedance properties were investigated to develop chemical sensors and biosensors. The nanoweb electrodes were fabricated with multi-wall CNT (MWCNT) based on PAN using an electrospinning technique. The morphology of the nanoweb electrode was investigated utilizing SEM and TEM. With various amounts of buffer solution, the electrical impedance of the composite electrodes was measured using an LCR meter. The capacitance values showed drastic increments while the resistance values only changed within a few percent range. It is found that the addition of CNTs to a nanofiber web can improve not only the sensitivity but also the linearity of a nanoweb compared to a no-CNT web electrode. Since CNTs have excellent electrochemical properties, the electrical impedance of nanoweb embedded CNTs may be remarkably changed by the ions produced by a buffer solution, and this improves the sensing response of the nanoweb electrode consequently.