Sensing of Alphacypermethrin Pesticide Using Modified Electrode of Chitosan-Silver Nanowire Nanocomposite Langmuir Blodgett Film

ABSTRACT

We report on the sensing of a hazardous pesticide alphacypermethrin (ACM) using electrochemical technique through a nanocomposite film modified electrode. The nanocomposite film comprising of octadecylamine, chitosan, polyvinyl alcohol-silver nanowires and haemoglobin, shortly (OCPAH), was prepared by Langmuir–Blodgett (LB) film deposition technique on various substrates and electrodes. The composite LB film was characterised by UV-visible spectroscopy and scanning electron microscopy, which confirms the stable and multilayer film. The LB film modified electrode was used for sensing ACM pesticide by cyclic voltammetry (CV), differential pulse voltammetry (DPV), and square wave voltammetry (SWV) techniques. The achieved sensing parameters such as limit of detection as 14 nM, 5 nM and 10 nM; linear range as 10–100 nM, 10–40 nM and 50–100 nM/10–100 nM; and sensitivity as 0.418 µA/nM/cm², 0.259 µA/nM/cm² and 0.271 µA/nM/cm² for CV, DPV and SWV techniques, respectively. The reported sensor is found to have stability of 74% upto 20 cycles, the relative standard deviation (RSD) value for metal ion/organic interference species as 2% and for real samples are within 1.4% using CV technique. The reported nanocomposite-based ACM pesticide sensor will open up new options for research on LB film nanocomposite-based sensing of different organophosphorus groups of pesticides.

KEYWORDS:

• Sensor
• pesticide
• alphacypermethrin
• electrochemical
• Langmuir–Blodgett film
• polymer nanocomposite

Acknowledgements

Authors acknowledge DST-SERB, Government of India, for financial support through SERB projects (No. EMR/2016/002634) sanctioned to Dr. Mrityunjoy Mahato. Sanjeev Bhandari thanks SERB for providing the Non-Net JRF fellowship. We also thank SAIF (NEHU) for providing TEM Facilities. Also, we thank the Department of Nanotechnology, NEHU and Department of Chemistry, Guwahati University for cyclic voltammetry, XRD and FE-SEM characterisation.

Disclosure statement

No potential conflict of interest was reported by the author(s).

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Funding

This work was supported by the Science and Engineering Research Board [EMR/2016/002634].