Electrochemical detection of 2-nitrophenol with BaO nanorods modified glassy carbon electrode.

Abstract

Here, an electrochemical detection approach (differential pulse voltammetry) was employed to develop 2-nitrophenol (2-NP) sensor probe using glassy carbon electrode (GCE) coated by wet-chemically synthesized nanorods (NRs) of BaO. The prepared BaO NRs were totally characterized by Field emission scanning electron microscopy (FESEM), Energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS) and powder X-ray diffraction (XRD) analysis. The peak currents by differential pulse voltammetric (DPV) analysis of 2-NP are plotted against the concentration to obtain the calibration curve of the 2-NP detection. It is found linear from 1.5 to 9.0 µM, which defined as the dynamic range (LDR) for 2-NP detection in phosphate buffer solution. The sensor sensitivity is calculated from the slope of LDR by considering the active surface area of NRs coated on GCE (0.0316 cm2) and found as 17.5949 µAµM-1cm-2. The limit of detection (LOD) is calculated as 0.50±0.025 µM from signal/noise (S/N) ratio of 3. Moreover, the sensor analytical parameters such as reproducibility, long-term performing ability (stability), response time and validity in real environmental samples are found acceptable and satisfactory results. Thus, the noble development of nanomaterial-based electrochemical chemical sensor might be an effective approach to the sensor technology to detect the carcinogenic and hazardous toxins for the environment safety and healthcare fields in a broad scale.