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    Inkjet printing of highly dispersed, shortened, and defect-rich MWCNTs to construct flexible electrochemical sensors for the detection of bisphenol A in milk samples
    (Pergamon-Elsevier Science Ltd, 2023) Sarikaya, Sumeyye; Ipekci, Hasan Huseyin; Kotan, Hasan; Uzunoglu, Aytekin
    An inkjet-printed electrochemical bisphenol A (BPA) sensor was developed by exploiting the high dispersibility of shortened and defect-rich nitrogen-doped multi-walled carbon nanotubes (MWCNTs). To enhance the dispersibility of MWCNTs in water-based dispersant, the defect concentration was increased by both creating shortened CNT and heteroatom doping, and modification of their surfaces with sulfonate (SO3H) groups. CNTbased inks were prepared by dispersing modified CNT structures in deionized water and the stability and physical properties of the inks were determined. The results suggested that the shortening of MWCNT and SO3H functionalization strategies improved the stability of CNT-based aqueous inks significantly, which enabled the preparation of highly concentrated inks up to 20 mg/ml with high stability. The CNT-based inks were printed on flexible polyethylene tetraflate (PET) and used as an electrochemical BPA sensor. The electrochemical analytical performance of the printed sensors was evaluated using chronoamperometry and differential pulse voltammetry methods. The sensors showed a wide linear range of 5-100 (CA) and 60-700 (DPV) with a LOD of 0.7 mu M. The real sample analysis was conducted in milk and high recoveries were obtained, suggesting the applicability of the sensors in real media.
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    Modification of Commercial Pt/C Catalyst with Graphene Nanoplatelets for Sensitive and Selective Detection of Acetaminophen in Commercial Tablets
    (Electrochemical Soc Inc, 2020) Sarikaya, Sumeyye; Ozcan, Merve; Uzunoglu, Aytekin
    Here, commercial Pt/C catalyst was modified with graphene nanoplatelets (GNPs) to construct electrochemical acetaminophen (APAP) sensors with high sensitivity and wide linear range. Physical mixture of Pt/C and GNPs with various contents were used to prepare ink formulations for the construction of electrochemical APAP sensors. The carbon content was kept constant to show the effect of GNPs content in the catalyst layer while decreasing the total Pt loading on the electrode surface. The Pt/C and GNPs were characterized using XRD, TEM, XPS, SEM, and EDS techniques. The analytical results indicated that the performance of the sensors was improved after GNPs introduction in Pt/C catalyst. It is of the note that while the amount of precious metal, Pt, on the electrode surface was decreased, the overall sensor performance was enhanced, confirming the importance of the catalyst support on the electrochemical performance of the catalyst systems. The sensors displayed a wide range of 0.1-3.0 mM with a high sensitivity of 209.07 mu A. mM(-1). cm(-2). The reliability of the constructed sensors was evaluated by the determination of APAP concentration in commercial tablets and excellent recovery values were achieved.