Ultrasensitive Multiwall Carbon Nanotube-Mesoporous MCM-41 Hybrid-Based Platform for the Electrochemical Detection of Ascorbic Acid.

VIRGINIA M. VASCHETTI; BENJAMÍN N. VIADA; ALEJANDRO TAMBORELLI; GRISELDA A. EIMER; GUSTAVO A. RIVAS*; PABLO R. DALMASSO*

ANALYST

ROYAL SOC CHEMISTRY

Lugar: CAMBRIDGE; Año: 2022 vol. 147 p. 2130 - 2130

0003-2654

his work presents for the first time the systematic preparation of a novel carbon nanotube-MCM-41 hybrid employing the mesoporous material MCM-41 as a successful dispersant for multiwall carbon nanotubes (MWCNTs). Relevant dispersion variables such as the amount of MWCNTs, MCM-41 concentration, and sonication time were optimized through a central composite design (CDD)/response surface methodology (RSM). Several solvents were evaluated and N,N-dimethylformamide (DMF) was selected because it allowed reaching stable dispersions with very good electrochemical response. The electrochemical performance of glassy carbon electrodes (GCE) modified with different hybrids was evaluated by cyclic voltammetry (CV) using ascorbic acid (AA) as redox marker, while their surface morphology was characterized by SEM microscopy. The optimal MWCNT–MCM-41 dispersion condition was 0.75 mg mL−1 MWCNTs, 0.25 mg mL−1 MCM-41, and 30 min sonication. Both, electrochemical results and SEM images corre