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    Detection of Pesticide via Nanoparticle Based Quartz Crystal Microbalance Sensor
    (2020) Yılmaz, Fatma; Denizli, Adil; Çakır, Oğuz; Baysal, Zübeyde; Göktürk, Ilgım; Bakhspour, Monireh
    In this study, chlorpyrifos (Cps) imprinted nanoparticles based QCM sensor were prepared for the detection ofchlorpyrifos pesticide. Cps imprinted poly(ethylene glycol dimethacrylate- N- metacryloyl- (L)- tryptophan) (PEDMATrp)nanoparticles were prepared and then these nanoparticles were attached to the surface of QCM sensor chip. Also, nonimprinted PEDMATrp QCM sensor was prepared without using Cps molecule to evaluate the imprinting efficiency. Cpsimprinted and non-imprinted nanoparticles were characterized by zeta-sizer and Fourier transform infraredspectrophotometer-attenuated total reflection (FTIR-ATR) spectrophotometer. Cps imprinted and non-imprinted QCMsensors were also characterized by atomic force microscopy, ellipsometer, and contact angle measurements. The preparedsensors were applied for selective Cps detection in aqueous solution for the range of 0.015-2.9 nM. The selectivity studies ofthe QCM sensor were examined by using competitive pesticide molecules such as diazinon and parathion (2.9 nM), which aresimilar to Cps in size and shape. The reusability studies of the prepared sensors were investigated by applying the samepesticide concentration (1.45 nM), four times consecutively.