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      저자 : Xiqing Liu (검색결과 2 건)
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      • KCI등재

        A Novel Fluorescent Nanoswitch Based on Carbon Dots for Sensitive Detection of Hg2+ and I-

        Xiqing Liu,Xiao Wei,Yeqing Xu,Hongji Li,Kai Lu,Kun Wang,Yongsheng Yan 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.2

        In this paper, a novel fluorescent nanoswitch based on carbon dots (CDs) was developed for the sensitive and selective determination of Hg2+ and I-. The CDs were obtained by simple hydrothermal process and had a strong fluorescence emission at 440 nm. The fluorescence of the CDs can be selectively quenched by Hg2+ ion, and then the I- was added into the system, which can interact with Hg2+ and recover fluorescence of the CDs. Under optimal conditions, the quenching fluorescence intensity on addition of Hg2+ has obtained a satisfactory linear relationship covering the linear range of 0–50 µM with the linear relationship (R21 = 0.9991), and the limit of detection is 0.047 µM. The additions of I- could lead to the fluorescence intensity of the solution of CDs and Hg2+ (50 µM) recover rapidly, which is linearly related (R22 = 0.9957) to the concentration of I- in the range from 0 to 70 µM, the detection limit for I- was calculated to be 0.084 µM. Moreover, the developed method to detect Hg2+ and I- was evaluated in real examples, and the fluorescence switching can sensitively and selectively detect Hg2+ and I- over some potentially interfering ions, the recoveries were up to 97.8–107.0% and 96.7–106.6%, respectively.

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        A tailored molecular imprinting ratiometric fluorescent sensor based on red/blue carbon dots for ultrasensitive tetracycline detection

        Xiqing Liu,Tao Wang,Wenjuan Wang,Zhiping Zhou,Yongsheng Yan 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.72 No.-

        The molecular imprinting ratiometricfluorescence sensor has exhibited great potential in biological andenvironmental detection because of the combination between the excellent selectivity of molecularimprinting technique and outstanding robustness of ratiometric measurement methods On this basis,two kinds of different well-resolved wavelengths and high-fluorescent carbon dots (CDs) were preparedby various solvent extraction using osmanthus fragrans leaves as carbon source. Then the ratiometricfluorescence sensor (MIPs@rCDs/bCDs@SiO2) has been constructed by the obtained CDs which the redemissionCDs (rCDs) were used to responsive signal and the blue-emission CDs (bCDs) was served asreference signal and applied for highly selective and excellent sensitive detection of tetracycline (TC). Under optimum conditions, the ratiometricfluorescence MIPs@rCDs/bCDs@SiO2 sensor has alsoexhibited lower detection limit of 1.19 nM and the linear range of 0–50 nM. The ratiometricfluorescencesensor was further successfully employed to the determination of TC in water samples gathered fromlocal river water and tap water, indicating its great worth toward water sample analysis in complicatedenvironments.

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