caa a22 4500 445880317 CHVBK 20180317145540.0 cr unu---uuuuu 170323e20111001xx s 000 0 eng 10.1007/s00604-011-0655-7 doi (NATIONALLICENCE)springer-10.1007/s00604-011-0655-7 Ultrasensitive detection of mercury(II) ion using CdTe quantum dots in sol-gel-derived silica spheres coated with calix[6]arene as fluorescent probes [Elektronische Daten] [Tao Li, Yunyou Zhou, Junyong Sun, Dongbao Tang, Shixue Guo, Xueping Ding] We have developed a simple method for the preparation of highly fluorescent and stable, water-soluble CdTe quantum dots in sol-gel-derived composite silica spheres that were coated with calix[6]arene. The resulting nanoparticles (NP) were characterized in terms of UV, fluorescence and FT-IR spectroscopy and by TEM. The results show that the new NPs display more intense fluorescence intensity and are more stable than its precursors of the type SiO2/CdTe. In addition, the new NPs exhibit a higher selectivity for the determination of Hg2+ than for other metal ions. Under the optimum conditions, the relative fluorescence intensity decreases with the concentration of Hg2+ in the range from 2.0 to 14.0nmolL−1 and the detection limit is 1.55nmolL−1. The method is based on the quenching of fluorescence by Hg2+ and expected to serve as a practical fluorescence test for rapid detection of Hg2+. A mechanism is suggested to explain the inclusion process by a Langmuir binding isotherm, and fluorescence quenching is best described by the Stern-Volmer equation. Figure The Scheme suggests that we synthesis of CdTe nanocystals in sol-gel-derived composite silica spheres coated with Calix[6]arene (C[6]/SiO2/CdTe NPs). The new C[6]/SiO2/CdTe NPs display more intense fluorescence intensity and are more stable than its precursors of the type SiO2/CdTe NPs. Under the optimum conditions, the relative fluorescence intensity decreases with the concentration of Hg2+. The C[6]/SiO2/CdTe NPs as fluorescent probes can be used for ultrasensitive, highly selective, simple, convenient and rapidly efficient detection of extremely trace amount of heavy metal ion Hg2+. Springer-Verlag, 2011 Quantum dots nationallicence C[6]/SiO2/CdTe NPs nationallicence SiO2/CdTe NPs nationallicence Hg2+ nationallicence Spectrofluorimetry nationallicence Li Tao Anhui Key Laboratory of Chemo-Biosensing, College of Chemistry and Materials Science, Anhui Normal University, 241000, Wuhu, China aut Zhou Yunyou Anhui Key Laboratory of Chemo-Biosensing, College of Chemistry and Materials Science, Anhui Normal University, 241000, Wuhu, China aut Sun Junyong Anhui Key Laboratory of Chemo-Biosensing, College of Chemistry and Materials Science, Anhui Normal University, 241000, Wuhu, China aut Tang Dongbao Anhui Key Laboratory of Chemo-Biosensing, College of Chemistry and Materials Science, Anhui Normal University, 241000, Wuhu, China aut Guo Shixue Anhui Key Laboratory of Chemo-Biosensing, College of Chemistry and Materials Science, Anhui Normal University, 241000, Wuhu, China aut Ding Xueping Anhui Key Laboratory of Chemo-Biosensing, College of Chemistry and Materials Science, Anhui Normal University, 241000, Wuhu, China aut Microchimica Acta Springer Vienna 175/1-2(2011-10-01), 113-119 0026-3672 175:1-2<113 2011 175 604 https://doi.org/10.1007/s00604-011-0655-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00604-011-0655-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Li Tao Anhui Key Laboratory of Chemo-Biosensing, College of Chemistry and Materials Science, Anhui Normal University, 241000, Wuhu, China aut NATIONALLICENCE 700 1- Zhou Yunyou Anhui Key Laboratory of Chemo-Biosensing, College of Chemistry and Materials Science, Anhui Normal University, 241000, Wuhu, China aut NATIONALLICENCE 700 1- Sun Junyong Anhui Key Laboratory of Chemo-Biosensing, College of Chemistry and Materials Science, Anhui Normal University, 241000, Wuhu, China aut NATIONALLICENCE 700 1- Tang Dongbao Anhui Key Laboratory of Chemo-Biosensing, College of Chemistry and Materials Science, Anhui Normal University, 241000, Wuhu, China aut NATIONALLICENCE 700 1- Guo Shixue Anhui Key Laboratory of Chemo-Biosensing, College of Chemistry and Materials Science, Anhui Normal University, 241000, Wuhu, China aut NATIONALLICENCE 700 1- Ding Xueping Anhui Key Laboratory of Chemo-Biosensing, College of Chemistry and Materials Science, Anhui Normal University, 241000, Wuhu, China aut NATIONALLICENCE 773 0- Microchimica Acta Springer Vienna 175/1-2(2011-10-01), 113-119 0026-3672 175:1-2<113 2011 175 604 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer