CoFe-MOF nanoarray as flexible microelectrode for electrochemical detection of catechol in water samples
S. Arivuselvan,
Mari Elancheziyan,
Raji Atchudan,
Deivasigamani Ranjith Kumar,
E. Sivasurya,
S. Philomina Mary,
Pandi Muthirulan,
Keehoon Won,
Manoj Devaraj
Affiliations
S. Arivuselvan
Department of Chemistry, Karpagam Academy of Higher Education, Coimbatore, 641 021, India; Centre for Material Chemistry, Karpagam Academy of Higher Education, Coimbatore, 641 021, India
Mari Elancheziyan
Department of Chemical and Biochemical Engineering, College of Engineering, Dongguk University-Seoul, 30 Pildong-ro 1-gil, Jung-gu, Seoul, 04620, Republic of Korea
Raji Atchudan
Department of Chemistry, Saveetha School of Engineering, Saveetha Institute of Medical and Technical Sciences, Chennai, 602105, Tamil Nadu, India; School of Chemical Engineering, Yeungnam University, Gyeongsan, 38541, Republic of Korea
Deivasigamani Ranjith Kumar
Centre for Organic and Nanohybrid Electronics, Silesian University of Technology, Konarskiego 22B, 44-100, Gliwice, Poland
E. Sivasurya
Department of Chemistry, Karpagam Academy of Higher Education, Coimbatore, 641 021, India; Centre for Material Chemistry, Karpagam Academy of Higher Education, Coimbatore, 641 021, India
S. Philomina Mary
Department of Chemistry, Srimati Indira Gandhi College, (Affiliated to Bharathidasan University), Tiruchirapalli, 620002, India
Pandi Muthirulan
Department of Chemistry, Lekshmipuram College of Arts and Science, Neyyoor, 629802, India
Keehoon Won
Department of Chemical and Biochemical Engineering, College of Engineering, Dongguk University-Seoul, 30 Pildong-ro 1-gil, Jung-gu, Seoul, 04620, Republic of Korea
Manoj Devaraj
Department of Chemistry, Karpagam Academy of Higher Education, Coimbatore, 641 021, India; Centre for Material Chemistry, Karpagam Academy of Higher Education, Coimbatore, 641 021, India; Corresponding author. Department of Chemistry, Karpagam Academy of Higher Education, Coimbatore, 641021, Tamil Nadu, India.
A simple, selective, and straightforward enzyme-free electrochemical sensor has been designed and developed using cobalt hexacyanoferrate metal-organic framework (CoFe-MOF) nanoarray. The prepared CoFe-MOF nanoarray has been successfully grown over a carbon cloth (CC) to form CoFe-MOF/CC as a flexible microelectrode for the detection of catechol. The surface of the activated CC was covered uniformly with CoFe-MOF in the form of nanoarray and exhibited double-shelled cubic morphology. The CoFe-MOF/CC nanoarray microelectrode showed a pair of well-defined redox peaks corresponding to the [Fe(CN)6]4-/3- redox signal. Interestingly, the fabricated nanoarray microelectrode has displayed superior peak current at lower onset potential with high electrochemical response compared to unmodified potassium hexacyanoferrate (K3 [Fe(CN)6]) over CC microelectrode and bare activated CC. Further, the developed CoFe-MOF/CC nanoarray microelectrode for the oxidation of catechol was examined with consecutive injections of catechol. A fast and noticeable improvement in oxidation peak current was observed, thus representing the excellent electrocatalytic oxidation of catechol at the modified nanoarray microelectrode. Besides, CoFe-MOF/CC microelectrode exhibits an excellent linear response over a concentration range from 0.005 to 2.8 mM with low detection limit (LOD) and high sensitivity of 0.002 mM (S/N = 3) and 205.99 μA/mM, respectively. Moreover, the prepared nonenzymatic sensor showed outstanding stability, acceptable reproducibility, and repeatability, along with good interference ability. Catechol in spiked water samples was successfully quantified.
