title: Near-infrared to near-infrared upconverting NaYF4:Yb3+,Tm3+ nanoparticles-aptamer-Au nanorods light resonance energy transfer system for the detection of mercuric(II) ions in solution.
abstract: A new luminescence resonant energy transfer (LRET) system has been designed that utilizes near-infrared (NIR)-to-NIR upconversion lanthanide nanophosphors (UCNPs) as the donor, and Au nanorods (Au NRs) as the acceptor. The UCNPs were excited by a near-infrared (980 nm) wavelength and also emitted at a near-infrared wavelength (804 nm) using an inexpensive infrared continuous wave laser diode. The Au NRs showed a high absorption band around 806 nm, which provided large spectral overlap between the donor and the acceptor. Hg(2+) ions were added to an aqueous solution containing the UCNPs and Au NRs that were modified with a Hg(2+) aptamer. Then, a sandwich-type LRET system was developed for the detection of Hg(2+) ions that had high sensitivity and selectivity in the NIR region. The method was successfully applied to the sensing of Hg(2+) ions in water and human serum samples.
authors: Anhui Key Laboratory of Chemo-Biosensing, Ministry of Education, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, PR China.
authors: Hong-Qi
authors: HQ
authors: Chen
authors: Fei
authors: F
authors: Yuan
authors: Shao-Zhen
authors: SZ
authors: Wang
authors: Juan
authors: J
authors: Xu
authors: Yi-Yan
authors: YY
authors: Zhang
authors: Lun
authors: L
authors: Wang
mesh_terms: D004735:Energy Transfer; D005459:Fluorides / Q000737:chemistry*; D007477:Ions / Q000032:analysis; D008628:Mercury / Q000032:analysis*; D053768:Metal Nanoparticles / Q000737:chemistry*; D043942:Nanotubes / Q000737:chemistry; D012834:Silver / Q000737:chemistry*; D019265:Spectroscopy, Near-Infrared / Q000379:methods*; D013932:Thulium / Q000737:chemistry; D015018:Ytterbium / Q000032:analysis / Q000737:chemistry; D015019:Yttrium / Q000737:chemistry*
chemical_list: D007477:Ions; C525362:sodium yttriumtetrafluoride; D012834:Silver; D015019:Yttrium; D013932:Thulium; C033160:thulium oxide; D008628:Mercury; D015018:Ytterbium; D005459:Fluorides