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Author: search.filters.author.Chaowicharat, EkalakSubject: search.filters.subject.Animated PVC

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    Item type:Publication,
    Modification of polyvinyl chloride ion-selective membrane for nitrate ISFET sensors
    (2020-05-15)
    Chaisrirattanakua, Woraphan
    ;
    Bunjongpru, Win
    ;
    Pankiew, Apirak
    ;
    Srisuwan, Awirut
    ;
    Jeamsaksiri, Wutthinan
    In this work, a Polyvinyl Chloride (PVC) ion-selective membrane was modified to detect nitrate based on Ion Selective Field Effect Transistor (ISFET) sensing technology in order to eliminate chloride interference. A modification was done with ethylenediamine solution to achieve animated PVC, which was then oxidized with sodium tungstate to form nitrone coated PVC membrane. The modified PVC was characterized using FTIR, <sup>1</sup>H NMR, GPC, FE-SEM and EIS. The FTIR spectrum of animate PVC demonstrated -NH<inf>2</inf> bending at 1580 cm<sup>−1</sup>, NO<inf>2</inf> asymmetric stretching at 1650 cm<sup>−1</sup> and N[sbnd]O out-of-plane deformation vibration at 837 cm<sup>−1</sup>. GPC analysis of the modified PVC showed that the PVC molecular weight was shifted to a high molecular weight. The PVC ion-selective membrane was immobilized on the ISFET to create nitrate sensors with the following characteristics. The Nitrate-Nitrogen detection limit is 1.20 ppm with linear range from 3−20 ppm at sensitivity of 56 ± 2 mV/dec. The sensor is useful for detecting small amount of nitrate in a mixed solution, which usually is the case in most situations. This sensor could be applied in many applications, such as agricultural industry, water reserve management and medical field as well.