Journal
JOURNAL OF MATERIALS CHEMISTRY B
Volume 4, Issue 7, Pages 1310-1317Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5tb01995h
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Funding
- National Natural Science Foundation of China [51002046, 51102082, 51202061, 21573062]
- Natural Science Foundation for the Natural Science of Heilongjiang Province of China [LC2012C02, B201308]
- Research Fund of Heilongjiang Provincial Education Department [12511377, 12521399]
- Postdoctoral Science-Research Developmental Foundation of Heilongjiang Province [LBH-Q11015]
- Innovative Talents Program for the Returned Overseas Scholars of Harbin of China [2012RFLXG031]
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As vital biological mediators, the accurate detection of nitrite (NO2-) and hydrogen peroxide (H2O2) is desirable for clinical monitoring and diagnosis. Herein, cationic 2,9,16,23-tetra[4-(N-methyl) pyridinyloxy]-phthalocyanine cobalt(II) ([TMPyPcCo](4+)) and acid-treated multiwalled carbon nanotubes (aCNTs) were alternately self-assembled on the glassy carbon electrode (GCE) by means of the electrostatic interaction, leading to a 3D loose and interconnected assembly of [TMPyPcCo/aCNTs](n) multilayer films. In the [TMPyPcCo/aCNTs](n) films, [TMPyPcCo](4+) is anchored onto the surface of aCNTs without any inert polymer binders, which is beneficial to expose more active sites for electrocatalysis. The effective combination of [TMPyPcCo](4+) and aCNTs brings many advantages in electrochemical detection, involving the fast oriented transmission of charges, permeable channels for ion adsorption and transport, and more sensing sites, thus the [TMPyPcCo/aCNTs](n) films display excellent electrochemical sensitivity towards both NO2- and H2O2. The responses of NO2- and H2O2 vary linearly with respect to the concentration from 5 mM to 30 mM and 10 mM to 9 mM. Furthermore, the superior cycling stability, reproducibility, and selectivity make [TMPyPcCo/aCNTs](n) films suitable for the real samples.
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