Electrochemical, microscopic and spectroscopic characterization of benzene diamine functionalized single walled carbon nanotube-cobalt (II) tetracarboxy-phthalocyanine conjugates

In this paper we report on the synthesis and characterization of 1,4-benzene diamine (BDA) functionalized single walled carbon nanotubes linked to cobalt (II) tetracarboxy-phthalocyanine. The characterization of the conjugate was through UV–vis, FTIR and X-ray diffraction (XRD) spectroscopies and by transmission electron microscope (TEM) and electrochemical methods. The conjugate is used for the electrochemical characterization of diuron. The catalytic rate constant for diuron was 4.4 × 103 M−1 s−1 and the apparent electron transfer rate constant was 18.5 × 10−6 cm s−1. The linear dynamic range was 1.0 × 10−5–2.0 × 10−4 M, with a sensitivity of ∼0.42 A mol−1L cm−2 and a limit of detection of 0.18 μM using the 3δ notation.

Graphical abstract1,4-Benzene diamine (BDA) functionalized single walled carbon nanotubes are linked to cobalt (II) tetracarboxyl-phthalocyanine and employed in the electrochemical detection of diuron.Figure optionsDownload full-size imageDownload high-quality image (76 K)Download as PowerPoint slideResearch highlights► 1,4-Benzene diamine (BDA) functionalized single walled carbon nanotubes has been chemically linked to cobalt (II) tetracarboxy-phthalocyanine. ► Transmission electron microscope (TEM) images shows attachment of the phthalocyanine to single walled carbon nanotube. ► The resulting conjugate is catalytic towards the electrochemical characterization of diuron. ► The conjugate shows efficient electron transfer mediation relative to the phthalocyanine or single walled carbon nanotubes alone.