Dispersions of hollow and bamboo-like multi-walled carbon nanotubes in polyethyleneimine: critical analysis of the preparation conditions and applications for electrochemical sensing

MARCOS EGUÍLAZ, NANCY F. FERREYRA* GUSTAVO A. RIVAS*.

WILEY-V C H VERLAG GMBH

Lugar: Weinheim; Año: 2014 vol. 26 p. 2434 - 2434

his work is focused on the critical analysis of the influence of the experimental conditions on the efficient dispersion of hollow-type (hMWCNT) and bamboo-like (bMWCNT) multiwall-carbon nanotubes with polyethylenimine (PEI). Spectroscopic and electrochemical studies demonstrated that the adequate combination of optimized ultracavitation and centrifugation is essential to obtain successful dispersions. The selected conditions were 1.0mgmL-1 hMWCNT in 3.0mgmL-1 PEI sonicated with a sonicator probe operating at 50 % of amplitude for 300s and centrifuged at 9000rpm for 15min. Bamboo-like multiwall-carbon nanotubes were faster exfoliated and glassy carbon electrodes (GCE) modified with the resulting dispersion allowed the amperometric detection hydrogen peroxide of at lower potentials (0.100V) with a detection limit of 5.5µM.