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Author: search.filters.author.Eiamchai, PitakSubject: search.filters.subject.Silver nanorod

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    Item type:Publication,
    Study on detection of carbaryl pesticides by using surface-enhance raman spectroscopy
    (2020-01-01)
    Chakaja, Chaiwat
    ;
    Limwichean, Saksorn
    ;
    Nuntawong, Noppadon
    ;
    Eiamchai, Pitak
    ;
    Kalasung, Sukon
    In this research, the Ag nanorod structure was used as surface enhanced Raman scattering (SERS) chip which provides a sensitive detection signal for trace analysis of carbaryl pesticide. Carbaryl in solid form was measured by using the standard Raman spectroscopy to investigate the spectrum. Carbaryl at various concentrations was prepared in acetonitrile and dropped on the SERS chip for measuring Raman spectrum by a portable Raman spectrometer. The measurement condition including laser power and exposure time were studied to test the performance of SERS chip for carbaryl detection. From the results, the SERS chip useful for enhancing the Raman scattering signal which was increased depending on the laser power and exposure time. Carbaryl can be detected on SERS chip couple with the portable Raman spectrometer with the limit of detection of 10<sup>-5</sup> M.
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    Rapid detection of cypermethrin by using surface-enhanced raman scattering technique
    (2020-01-01)
    Leung, Wipawanee
    ;
    Limwichean, Saksorn
    ;
    Nuntawong, Noppadon
    ;
    Eiamchai, Pitak
    ;
    Kalasung, Sukon
    Cypermethrin is a toxic pesticide in the pyrethroid group. A Surface Enhanced Raman Scattering (SERS) based sensor has been developed to achieve simple pesticide sensing. In this work, rapid detection of cypermethrin by using the handheld Raman spectroscopy coupled with SERS substrate was demonstrated. SERS-active silver nanorods substrate was used to enhance Raman signals of test samples. The effect of exposure time and drop volume of sample was studied for cypermethrin measurement. The results found that the silver nanorods substrate can be used to measure cypermethrin in the range of 10<sup>-6</sup> to 10<sup>-3</sup> M with a handheld Raman spectrometer. Furthermore, the Raman signal of cypermethrin was confirmed by measuring solid cypermethrin with the standard Raman spectrometer. SERS substrate was competent to detect cypermethrin with a limit of detection (LOD) of 10<sup>-6</sup> M.