Sensitive and selective Cu2+ sensor based on 4-(3-(thiophen-2-yl)-9H-carbazol-9-yl)benzaldehyde (TPCBZ) conjugated copper-complex

• TPCBZ was synthesized under microwave irradiation with auto generated pressure (at 130.0 °C).
• Cu2+ sensor was developed by TPCBZ/Nafion/GCE assembly for the first time.
• It exhibited the sensitivity (∼1.12974 μAcm−2 μM−1) and detection limit (∼0.84 nM) ever published in the literature.

4-(3-(thiophen-2-yl)-9H-carbazol-9-yl)benzaldehyde (TPCBZ) was synthesized under microwave irradiation with auto generated pressure (at 130.0 °C) and characterized by 1H NMR, 13C NMR, Mass and FTIR spectroscopy, thin-layer chromatography (TLC), and elemental analyses. Here, a thin-layer of TPCBZ onto glassy carbon electrode (GCE) is fabricated with conducting coating agents (5% nafion) to fabricate a selective and selective Cu2+ sensor in short response time in phosphate buffer phase. The fabricated sensor (TPCBZ/Nafion/GCE) is exhibited higher sensitivity, large-dynamic concentration ranges, long-term stability, and improved electrochemical performances towards TPCBZ-conjugated copper complex for selective Cu2+ sensor. The calibration plot is linear (r2: 0.9979) over the large Cu2+ ions concentration ranges (1.0 nM–1.0 mM). The sensitivity and detection limit is ∼1.12974 μAcm−2 μM−1 and ∼0.84 ± 0.02 nM (signal-to-noise ratio, at a SNR of 3) respectively, which is calculated from the slope of the calibration plot. This novel effort is initiated a well-organize way of efficient cationic sensor improvement with carbazide for heavy metallic pollutants in environmental and health-care fields in large scales.

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