A simple strategy to enhance the sensitivity of fluorescent sensor-based CdS quantum dots by using a surfactant for Hg2+ detection. Issue 36 (24th August 2021)

• Record Type: Journal Article
• Authors: Sianglam, Pradthana; Ngamdee, Kessarin; Nalaoh, Phattananawee; Promarak, Vinich; Hunt, Andrew J.; Ngeontae, Wittaya
• Is Part Of: Analytical methods. Volume 13:Issue 36(2021)
• Page Start: 4069
• Page End: 4078
• Publication Date: 2021-08-24
• Subjects: Chemistry, Analytic -- Periodicals; Analytical biochemistry -- Periodicals; Chemical laboratories -- Standards -- Periodicals; 543.1905
• DOI: 10.1039/d1ay01047f
• Languages: English
• ISSNs: 1759-9660

Abstract

Abstract : A simple strategy to enhance the detection sensitivity of fluorescent sensor-based CdS quantum dots (CdS QDs) by surfactant for the detection of mercury ions (Hg 2+ ). Abstract : A simple strategy to enhance the detection sensitivity of fluorescent sensor-based CdS quantum dots (CdS QDs) for the detection of mercury ions (Hg 2+ ) was demonstrated. l -Cysteine-capped CdS QDs (l -Cyst-CdS QDs) were synthesized and utilized as a probe for selective detection of Hg 2+ . The fluorescence intensity of the l -Cyst-CdS QDs was quenched in the presence of Hg 2+ . However, the detection sensitivity was unsatisfactory. Upon the addition of sodium dodecyl sulfate (SDS), the fluorescence intensity of l -Cyst-CdS QDs can be effectively enhanced. On the other hand, the fluorescence intensity of the l -Cyst-CdS QDs in the presence of SDS (SDS@l -Cyst-CdS QDs) was able to be dramatically decreased with the addition of Hg 2+ . Furthermore, the proposed sensor displayed excellent selectivity towards Hg 2+ compared to other cations. Under optimized conditions, the proposed sensor could be applied to detect trace amounts of Hg 2+ with a limit of detection of approximately 36 nM. The applicability of this sensor was demonstrated by the determination of Hg 2+ in real water samples, and the results agreed with those obtained from cold vapor atomic absorption spectrometry (CVAAS).