Multi-walled carbon nanotubes functionalized with bathocuproinedisulfonic acid: analytical applications for the quantification of Cu(II)

SALDAÑA, JORGE; GALLAY, PABLO; GUTIERREZ, SILVIA; EGUÍLAZ, MARCOS; RIVAS, GUSTAVO

Analytical and Bioanalytical Chemistry

SPRINGER HEIDELBERG

Año: 2020

1618-2642

his work reports the successful non-covalent functionalization of multi-walled carbon nanotubes (MWCNTs) withbathocuproinedisulfonic acid (BCS) and the analytical application of the resulting dispersion (MWCNTs-BCS) to developan electrochemical sensor for Cu(II) quantification. The sensor was obtained by casting glassy carbon electrodes (GCEs) withMWCNTs-BCS. The sensing mechanism was based on the open circuit preconcentration of Cu(II) at the electrode surface bycomplexation of Cu(II) through the phenanthroline ring nitrogen of the BCS that supports the MWCNTs, the reduction of thepreconcentrated Cu(II), and final differential pulse voltammetry-anodic stripping in 0.020 M acetate buffer, pH 5.00. Thesensitivity of the sensor was (2.73 ± 0.08) μA μM−1, with a linear range between 5.0 × 10−7 M and 6.0 × 10−6 M, a detectionlimit of 0.15 μM (9.5 μg L−1), and reproducibility of 6.2% using the same dispersion and 7.1% using three differentMWCNTs-