The highly sensitive nanoscale detection of nitrite is one of the major concerns in recent research due to its serious hazardous effects on the environment. The state-of-the-art fabrication of a cost-effective electrochemical nitrite sensor is one of the impetuses of modern research. A polyaniline-linked tetra amino cobalt phthalocyanine surface functionalized ZnO hybrid nanomaterial (PA-TaCoPc@ZnO) for sensitive electrochemical detection of nitrites is presented. Surface functionalization of ZnO nanoparticles with tetra amino cobalt (II) phthalocyanine (TaCoPc) yields TaCoPc-functionalized ZnO nanoparticles (TaCoPc@ZnO) in the first step, followed by the introduction of polyaniline (PANI) via oxidative polymerization in the presence of aniline to yield PA-TaCoPc@ZnO. The fabrication of the sensor was carried out by modifying the glassy carbon electrode with ZnO, TaCoPc@ZnO, tetra amino-substituted phthalocyanine linked by polyaniline (PA-TaCoPc), and PA-TaCoPc@ZnO to evaluate the electrochemical performance. Sensors of PA-TaCoPc@ZnO exhibited superior electrocatalytic activity, selectivity, sensitivity, and a low limit of detection (nanomolar concentration) toward nitrite ions compared to other systems. The remarkable electrocatalytic performance of PA-TaCoPc@ZnO can be attributed to the synergetic effect of the high surface area of nanosized ZnO with conducting polyaniline and metal-centered supramolecular TaCoPc.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Physics and Astronomy(all)
- Surfaces and Interfaces
- Surfaces, Coatings and Films