Synergistic fusion of Zn-NB engineered 0-D carbon quantum dot matrix-modified GCE for ultrasensitive monitoring of water-contaminating 2-nitro-1,4-phenylenediamine.

Zn-NB@CQD modified GCE achieves ultrasensitive detection of 2-nitro-1,4-phenylenediamine with a detection limit of 2.200 μM and high linearity up to 2800.4 μM.

• Why it matters: Effective monitoring of water contaminants like 2NPED is crucial for environmental safety and public health, yet existing sensors lack sufficient sensitivity and selectivity.
• What they did: A novel Zn-NB@CQD composite was synthesized via sonochemical and hydrothermal methods, then used to modify a glassy carbon electrode, enhancing electrochemical performance for 2NPED detection.
• The result: The sensor demonstrated high sensitivity (0.444 μAμM -1 cm -2), excellent reproducibility, and near-perfect recovery (~99%) in real water samples, enabling reliable water quality assessment.