Preparation of SnS2/MWCNTs chemically modified electrode and its electrochemical detection of H2O2

• Published in: Analytical and bioanalytical chemistry Vol. 412; no. 18; pp. 4403 - 4412
• Main Authors: Duan, Zhihong, Huang, Chaolian, Yang, Xiaoxiao, Hu, Ailin, Lu, Xiaoying, Jiang, Qi
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01-07-2020; Springer Nature B.V
• Subjects: Analytical Chemistry; Biochemistry; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Dispersion; Electrical measurement; Electrochemical analysis; Electrochemistry; Electrodes; Food Science; Hydrogen peroxide; Laboratory Medicine; Monitoring/Environmental Analysis; Morphology; Multi wall carbon nanotubes; Nanoparticles; Nanotechnology; Nanotubes; Regression analysis; Research Paper; Scanning electron microscopy; Selectivity; Spectroscopy; Tin; Tin disulfide; X-ray diffraction; MWCNTs chemically modified electrode; H; SnS; Electrochemical rapid detection; O
• ISSN: 1618-2642; 1618-2650
• DOI: 10.1007/s00216-020-02682-w

Considering the importance of hydrogen peroxide (H
2
O
2
) rapid detection, a SnS
2
/MWCNTs composite was prepared by loading tin disulfide (SnS
2
) nanoparticles on a three-dimensional conductive network composed of multi-walled carbon nanotubes (MWCNTs). The obtained SnS
2
/MWCNTs composite was used as the modified material to prepare a chemically modified electrode (CME), which was used for the rapid detection of H
2
O
2
. The morphology and structure of the obtained samples were characterized and analyzed by scanning electron microscopy, X-ray diffraction, and energy-dispersive spectroscopy. The electrochemical performance of the modified electrode was researched by cyclic voltammetry, amperometric
i–t
curves, and AC impedance techniques. The results show that SnS
2
nanoparticles with a size of about 33 nm are evenly dispersed on the surface of MWCNTs. The obtained SnS
2
/MWCNTs-CME has a strong current response to H
2
O
2
: it has a good linear relationship during the range of 0.248 ~ 16.423 mmol L
−1
, and its linear regression equation is
I
pa
(mA) = (−0.94 ± 0.05) × 10
−2
 + (− 0.43 ± 0.06) × 10
−2
c
(mmol L
−1
) (
R
2
 = 0.997) with a sensitivity of 87.84 μA mmol
−1
 L cm
−2
. The corresponding detection limit is 1.04 μmol L
−1
(S/
N
 = 3). At the same time, the SnS
2
/MWCNTs-CME has good selectivity, reproducibility, and stability.
Graphical abstract
Uniformly distributed SnS
2
/CNTs composite is used to prepare a chemically modified electrode for H
2
O
2
detection. The prepared electrode has a strong electrochemical response to H
2
O
2
due to the excellent conductivity and support of CNTs. And the SnS
2
/CNTs electrode shows high sensitivity and selectivity for the electrochemical detection of H
2
O
2
.