Effect of carbon-based nanomaterials on the electrochemical detection of nitrite by cobalt phthalocyanine
Inorganic Chemistry Communications, vol.181, 2025 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 181
- Publication Date: 2025
- Doi Number: 10.1016/j.inoche.2025.115200
- Journal Name: Inorganic Chemistry Communications
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Chemical Abstracts Core, Chimica, DIALNET
- Keywords: Carbon nanomaterials, Chronoamperometry, Metallophthalocyanine, Nitrite sensor
- Bilecik Şeyh Edebali University Affiliated: Yes
Abstract
In this work, a comparative study of the electrochemical sensor response of graphene nanoplatelets (GNPs), multi-walled carbon nanotubes (MWCNTs), and single-walled carbon nanotubes (SWCNTs) combined with a tetra-substituted cobalt (II) phthalocyanine bearing 4-(2-amino-5,6-dihydrobenzo[h]quinazolin-4-yl)phenol (CoPc) to nitrite was carried out. For this purpose, the optimal mixtures of CoPc and carbon-based nanomaterials were adsorbed on glassy carbon electrodes (GCEs) by the drop-casting method. Next, as-prepared electrodes were characterized by FT-IR, XPS, UV–vis, FE-SEM, EDX, cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and chronoamperometry (CA). CoPc/SWCNTs electrode exhibits improved electrocatalytic activity for nitrite oxidation compared to CoPc/GNPs and CoPc/MWCNTs electrodes. By using CA technique, CoPc/SWCNTs electrode displayed a low detection limit of 0.038 μM with a sensitivity of 70.16 μA.μM−1 cm−2 in a linear range of 20 to 180 μM. The enhanced electrocatalytic activity can be attributed to the high surface area of SWCNTs. This work provides a comparative approach for nitrite detection, which can be applied to metallophthalocyanine-based sensors for different analytes.