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    Comparison of polyacrylonitrile-and polypyrrole-based electrochemical sensors for detection of propamocarb in food samples
    (Turkish Chemical Society, 2022) Karakuş, Selcan; Taşaltın, Cihat; Gürol, İlke; Akkurt, Barbaros; Baytemir, Gülsen; Taşaltın, Nevin
    Food safety is a crucial issue; all countries have struggled against pesticides for years. In this study, Polypyrrole (PPy)- and Polyacrylonitrile (PAN)-based non-enzymatic electrochemical sensors were investigated to detect the pesticide propamocarb (PM) in food samples. Under the experimental conditions, the proposed strategy exhibited a high selectivity of the disposable PPy-based and PANbased sensors for the determination of propamocarb pesticide in the concentration of 1 ?M with a rapid detection within 1 min at pH 7.4 and 25 °C. We demonstrated the detection of PM residues on cucumber and tomato samples with good electrochemical performances towards the real-time usability on real food samples. PAN-based non-enzymatic electrochemical sensor has good sensitivity, higher selectivity, and stability than PPy-based non-enzymatic electrochemical sensor. The prepared PAN-based nonenzymatic electrochemical sensor is a potential candidate to be used in devices which perform food safety in agricultural products.
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    Nickel phthalocyanine-borophene nanocompositebased electrodes for non-enzymatic electrochemical detection of glucose
    (J Mater Sci: Mater Electron, 2022) Baytemir, Gülsen; Gürol, İlke; Karakuş, Selcan; Taşaltın, Cihat; Taşaltın, Nevin
    As diabetes has become one of the major health problems affecting hundreds of millions of people worldwide, the development of electrochemical sensors for the detection of glucose is crucial. Herein, the fabrication of nickel phthalocyanine (NiPc)-based and NiPc-borophene nanocomposite-based non-enzymatic electrochemical sensors for glucose detection at room temperature was demonstrated. The electrical conductivities of NiPc and NiPc-borophene nanocomposite have been measured as 3 9 10- 13 S cm-1 and 9.5 9 10-9 S cm-1 , respectively. The electrical conductivity of NiPc has been improved with the addition of borophene. Due to the high charge transport advantages of the borophene additive, the sensor sensitivity and detection limit have been improved. In voltammetric cycle of 60 s for the 1.5–24 mM glucose concentration range, NiPc-based sensor has a sensitivity value of 0.08 lAmM-1 cm-2 , while the NiPc-borofen nanocomposite-based sensor has a much higher sensitivity of 10.31 lAmM-1 cm-2 . The limit of detection values of the NiPc and NiPc-borophene nanocomposite-based sensors are 3 lM and 0.15 lM, respectively. The borophene nanosheets with good chemical stability and high carrier mobility have been shown to be a good candidate to form nanocomposite structure with NiPc for glucose detection.
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    Volatile organic compound detection performance of Borophene and PANI:b Borophene nanocompositebased sensors
    (J Mater Sci: Mater Electron, 2022) Taşaltın, Nevin; Taşaltın, Cihat; Güngör, Saliha; Karakuş, Selcan; Gürol, İlke; Teker, Murat
    In this study, Borophene and PANI:Borophene nanocomposite were prepared using a low cost and simple sonication method. The prepared PANI:b Borophene nanocomposite-based sensor has a higher response than the Borophenebased sensor against volatile organic compounds (VOCs). Both the b Borophenebased sensor and PANI:b Borophene nanocomposite sensor were selectively detected ethanol. The results reveal that limit of detection of the prepared b Borophene-based sensor and PANI:b Borophene nanocomposite sensor was 1000 and 60 ppm, respectively. The response time of the PANI:Borophene nanocomposite-based sensor was 40 s and the recovery time of the sensor was 12 s at 1200 ppm ethanol. The selective and rapid detection of the prepared PANI:Borophene nanocomposite-based sensor is impressive. PANI:b Borophene nanocomposite-based sensor has a great potential for future applications in high-performance VOC detectors.