Journal
JOURNAL OF NANOMATERIALS
Volume 2021, Issue -, Pages -Publisher
HINDAWI LTD
DOI: 10.1155/2021/6623668
Keywords
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Funding
- Chulalongkorn University Research Grant (Rachadapiseksompoj Grant) [CU_GR_63_37_21_05]
- Digital Economy and Society Development Funds (ONDE) [PR63031761]
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The study successfully demonstrated high sensitivity and selectivity in detecting organophosphate pesticides using synthesized copper oxide nanorods as electrodes. The enzyme-free CuO NR sensor showed promising performance in pesticide detection.
Inorganic electrode materials of low cost, lower complexity, and high stability have become the more preferred choice over enzyme usage in electrochemical sensors. In this work, copper oxide (CuO) nanorods (NRs) were synthesized on copper foil as electrodes through anodization and annealing processes. The synthesized electrodes were used to analyse the organophosphate pesticides (OPPs) and interference molecules by cyclic voltammetry. The CuO NR sensor was able to identify and quantify different kinds of OPPs with an elevated sensitivity of 1.269, 1.425, 1.657, and 2.833 mu A/ng mL(-1) for chlorpyrifos, parathion, paraoxon, and pirimiphos and explicitly separate them from interference molecules (i.e., carbaryl, paraquat, sodium nitrate, sodium sulphate, and toluene). Moreover, this electrochemical pesticide sensor achieved a very low limit of detection (LOD) in the 10(-7) molar level with a high selectivity among all tested analytes. The LOD for each pesticide ranged from 0.29 to 0.61 mu M, revealing the ability to define the maximum residue limit in food. In short, our enzyme-free CuO NR sensor is a promising platform to deliver a fast, low-cost, and reliable pesticide detection unit.
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