Evaluation of Carbon Nanotubes/Polyaniline Thin Films for Development of Electrochemical Sensors

Abstract

Thin films of multiwalled carbon nanotubes/polyaniline nanocomposites (CNT/PAni) were synthesized through the liquid/liquid (L/L) interfacial route, deposited over glass substrates, and evaluated through cyclic voltammetry and amperometry as electrochemical sensor, using L-ascorbic acid as probe. Films with three different CNT/PAni ratios have been prepared. After the spectroscopic and morphological characterization, the electrochemical sensitivity towards L-ascorbic acid was evaluated and compared with similar sensors prepared from neat multiwalled carbon nanotubes (MWCNT) or neat polyaniline (PAni). The nanocomposite film that presented the best nanotube dispersion through the polymeric matrix presented the higher sensor sensibility, 0.237 μA (μmol L −1) −1 and a limit of detection (LOD) of 7.91 μmol L −1. These results evidenced a synergistic effect among the components, and the best response depended on strict control of the polyaniline matrix distribution surrounding the nanotubes.

Highly Sensitive Detection Analytical Performance of 2-Nitrophenol Pollution in Various Water samples via Polyaniline/Sulfation CarboxymethylCellulose/Multi Carbon Nanotubes Nanocomposite-Based Electrochemical Sensor

“…Modification is carried out in order to improve the properties of CMC so as to achieve the desired qualities such as high conductivity, easy application, thermal stability, efficient electronic transport, as well as enhanced mechanical and physical properties. 13 This is based on the fact that the sulfation group is more active compared to a hydroxyl group. The process of modification entails reacting carboxymethyl cellulose with N(SO 3 Na) 3 , which is synthesized by sodium nitrite and sodium bisulfite in an aqueous solution.…”