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    Item type:Publication,
    Silica nanoparticle–modified paper strip–based new rhodamine B chemosensor for highly selective detection of copper ions in drinking water
    (2023-08-01)
    Sannok, Tadcha
    ;
    Wechakorn, Kanokorn
    ;
    Jantra, Jongjit
    ;
    Kaewchoay, Netnapit
    ;
    Teepoo, Siriwan
    A new rhodamine B derivative (RDB) was synthesized and utilized for the colorimetric detection of copper ions (Cu<sup>2+</sup>). This chemosensor utilized a paper strip as a support and a smartphone as a detector for on-site quantitative detection of Cu<sup>2+</sup> in water samples. Silica nanoparticles (SiNPs) were investigated as the modifier nanoparticles to achieve uniform color on the paper strip and showed a color response 1.9-fold higher than the one without SiNPs. The RDB chemosensor-based paper strip provided high selectivity toward Cu<sup>2+</sup> with a detection limit of 0.7 mg/L, and the working concentrations for Cu<sup>2+</sup> ranged from 1 to 17 mg/L. Parallel analyses of eight drinking water samples were conducted by inductively coupled plasma optical emission spectroscopy. The results were in good agreement, indicating the practical reliability of the established method with a short assay time and high selectivity. These indicate its great potential for on-site detection of Cu<sup>2+</sup>. Graphical abstract: [Figure not available: see fulltext.]
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    Item type:Publication,
    A study of fluorescent chemosensor for Fe(II) based on cyanoacrylic derivatives
    (2013-10-29)
    Thanakit, P.
    ;
    Chodjarusawad, T.
    ;
    Chittratan, P.
    ;
    Pratontap, S.
    ;
    Phromyothin, D.
    A chemosensor based on a cyanoacrylic (DTP-C) consists of dithieno [3,2-b;2',3'- d]pyrrole(DTP) as a chromophore and a cyanoacrylic moiety as an ionophore which linked by aromatic system. DTP-C demonstrates the response of complex with Fe(II) in dimethylformamide (DMF) solution. The binding mode of Fe(II)/DTP-C complex was characterized using UV-Visible and fluorescence spectroscopy. In addition, the effect of various MES buffer was then studied at 5%, 10%, 15% and 20% v/v in Fe(II)/DTP-C complex which the appropriate ratiomatric of MES buffer is 10%. The enhancement of Fe(II) concentration indicate a decrease emission intensity while the addition of buffer concentrations found to increase in the intensity. Moreover, quantum chemical calculations were used to study the electronic and optical properties of the molecular structure of DTP-C under the density functional theory. © (2013) Trans Tech Publications, Switzerland.