A novel molecularly imprinted sensor for imidacloprid based on poly (levodopa) /TiO2 nanoparticles composite
کد مقاله : 1040-PHYSCHEM20
امیرعباس رفعتی *1، جواد قدسی2
1هیئت علمی-مدیر گروه شیمی فیزیک
2محقق پسا دکترا
چکیده مقاله:
This research reports the first applying of poly (levodpa) in development of a molecularly imprinted sensor. A novel electrochemical sensor with the high selectivity and sensitivity was developed for imidacloprid (IMD) based on imprinted poly (levodopa) electropolymerized on glassy carbon electrode (GCE) modified with electrodeposited TiO2 nanoparticles (TiO2NPs). High affinity of IMD imprinted Poly (levodopa) to IMD caused the very selective response of electrode to IMD and electrodeposited TiO2NPs at electrode surface resulted the electrocatalytically reduction of IMD and subsequently high sensitivity of modified electrode. IMD imprinted poly (levodopa) electropolymerized on TiO2NPs was well characterized by FT-IR, SEM and EDX techniques. Sensor response to IMD was investigated by using square wave voltammetry (SWV), cyclic voltammetry (CV) and differential pulse voltammetry (DPV) techniques. Sensor showed really vast linear range of 2-400 µM, suitably low detection limit (LoD) of 0.3 µM and limit of quantitation (LoQ) of 1 µM By SWV measurements that are very acceptable in comparison to other reported IMD sensor. Sensor application in real samples for IMD determination was completely successful. Response time is completely short and sensor showed good repeatability and stability in several times of use.
کلیدواژه ها:
Molecularly imprinted sensor; Pesticide; Imidacloprid; Poly (levodopa); TiO2 nanoparticles.
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