Sensitive and selective m-tolyl hydrazine chemical sensor development based on CdO nanomaterial decorated multi-walled carbon nanotubes

• Published in: Journal of industrial and engineering chemistry (Seoul, Korea) 2019, 77(0), , pp.309-316
• Main Authors: Rahman, Mohammed M., Alam, M.M., Alamry, Khalid A.
• Format: Article
• Language: English
• Subjects: CdO/CNT nanocomposites; Environmental safety; Glassy carbon electrode; Linear dynamic range; m-Tolyl hydrazine sensor; Sensitivity; 화학공학
• ISSN: 1226-086X; 1876-794X
• DOI: 10.1016/j.jiec.2019.04.053

[Display omitted] •CdO/CNT nanocomposites prepared by wet-chemical method.•Fabricated highly sensitive m-tolyl hydrazine chemi-sensor.•Chemi-sensor exhibits the lowest detection limit.•Practically analyzed the real environmental samples.•Effective chemical sensor for health care and environmental fields. In this approach, the wet-chemical (co-precipitation) technique was used to prepare the cadmium oxide (CdO) nanoparticles (NPs) decorated with multi-walled carbon nanotubes (CNT) at low temperature. The powder XDR, UV–vis, TEM, XPS, and FTIR spectroscopy were used for detail characterization of the synthesized CdO/CNT nanocomposite (NCs). A thin layer of CdO/CNT NCs was deposited onto a glassy carbon electrode (GCE) with conducting coating binder to obtain a chemical sensor which was subsequently used to detect m-tolyl hydrazine hydrochloride (m-THyd) in buffer medium by electrochemical approach for environmental safety. The proposed m-THyd chemical sensor exhibited long-term stability, good selectivity, broad linear dynamic range, lower detection limit, and enhanced electrochemical response. The calibration curve of the current vs concentration of m-THyd was found to be linear (r2 = 0.9903) over the linear dynamic range (LDR) of 0.01 nM to 0.1 mM. The sensitivity (25.7911 μA μM cm−2) of chemical sensor was calculated from the slope of calibration curve and surface area of GCE (0.0316 cm2) and the detection limit (4.0 ± 0.2 pM) was estimated from the signal to noise ratio at 3. These preliminary results suggest that the newly developed CdO/CNT NCs nanocomposite could be promising electrochemical sensors for the detection of hazardous toxins to clean the environment in broad scales.