Highly Sensitive Glucose Sensing With Multi-Walled Carbon Nanotubes – Polyaniline Composite

Abstract

Multi-walled carbon nanotubes (MWCNTs) have been carboxylated and then immobilized with glucose oxidase (GOx) by amine coupling through EDC-NHS chemistry. These functionalized MWCNTs have been introduced into polyaniline matrix by electrochemical method. The different involved steps have been characterized with molecular and electronic spectroscopy. Prepared thin films preserved the enzymatic activity of GOx and their average electrical conductivity was measured as 3.78 × 10−1 S cm−1. Observed response time was 5 s and a linear pattern of current vs. concentration was recorded for 0.5–22 mM glucose.