title: Ratiometric fluorescent paper sensor utilizing hybrid carbon dots-quantum dots for the visual determination of copper ions.
abstract: A simple and effective ratiometric fluorescence nanosensor for the selective detection of Cu(2+) has been developed by covalently connecting the carboxyl-modified red fluorescent cadmium telluride (CdTe) quantum dots (QDs) to the amino-functionalized blue fluorescent carbon nanodots (CDs). The sensor exhibits the dual-emissions peaked at 437 and 654 nm, under a single excitation wavelength of 340 nm. The red fluorescence can be selectively quenched by Cu(2+), while the blue fluorescence is a internal reference, resulting in a distinguishable fluorescence color change from pink to blue under a UV lamp. The detection limit of this highly sensitive ratiometric probe is as low as 0.36 nM, which is lower than the U.S. Environmental Protection Agency (EPA) defined limit (20 μM). Moreover, a paper-based sensor has been prepared by printing the hybrid carbon dots-quantum dots probe on a microporous membrane, which provides a convenient and simple approach for the visual detection of Cu(2+). Therefore, the as-synthesized probe shows great potential application for the determination of Cu(2+) in real samples.
authors.affiliation: CAS Center for Excellence in Nanoscience, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, China and Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, China and State Key Laboratory of Transducer Technology, Chinese Academy of Sciences, Hefei, Anhui 230031, China. cljiang@iim.ac.cn zpzhang@iim.ac.cn.
authors.forename: Yahui
authors.initials: Y
authors.lastname: Wang
authors.affiliation: CAS Center for Excellence in Nanoscience, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, China and Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, China and State Key Laboratory of Transducer Technology, Chinese Academy of Sciences, Hefei, Anhui 230031, China. cljiang@iim.ac.cn zpzhang@iim.ac.cn.
authors.forename: Cheng
authors.initials: C
authors.lastname: Zhang
authors.affiliation: CAS Center for Excellence in Nanoscience, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, China and Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, China.
authors.forename: Xiaochun
authors.initials: X
authors.lastname: Chen
authors.affiliation: CAS Center for Excellence in Nanoscience, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, China and Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, China and State Key Laboratory of Transducer Technology, Chinese Academy of Sciences, Hefei, Anhui 230031, China. cljiang@iim.ac.cn zpzhang@iim.ac.cn.
authors.forename: Bo
authors.initials: B
authors.lastname: Yang
authors.affiliation: CAS Center for Excellence in Nanoscience, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, China and Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, China and State Key Laboratory of Transducer Technology, Chinese Academy of Sciences, Hefei, Anhui 230031, China. cljiang@iim.ac.cn zpzhang@iim.ac.cn.
authors.forename: Liang
authors.initials: L
authors.lastname: Yang
authors.affiliation: CAS Center for Excellence in Nanoscience, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, China and Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, China and State Key Laboratory of Transducer Technology, Chinese Academy of Sciences, Hefei, Anhui 230031, China. cljiang@iim.ac.cn zpzhang@iim.ac.cn.
authors.forename: Changlong
authors.initials: C
authors.lastname: Jiang
authors.affiliation: CAS Center for Excellence in Nanoscience, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, China and Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, China and State Key Laboratory of Transducer Technology, Chinese Academy of Sciences, Hefei, Anhui 230031, China. cljiang@iim.ac.cn zpzhang@iim.ac.cn.
authors.forename: Zhongping
authors.initials: Z
authors.lastname: Zhang
mesh_terms: D019187:Cadmium Compounds / Q000737:chemistry; D002244:Carbon / Q000737:chemistry; D003300:Copper / Q000737:chemistry*; D005453:Fluorescence; D005456:Fluorescent Dyes / Q000737:chemistry*; D007477:Ions; D057230:Limit of Detection; D036103:Nanotechnology / Q000379:methods*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D010209:Paper; D016062:Porosity; D045663:Quantum Dots / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D013691:Tellurium / Q000737:chemistry; D014867:Water / Q000737:chemistry
chemical_list: D019187:Cadmium Compounds; D005456:Fluorescent Dyes; D007477:Ions; D037742:Nanotubes, Carbon; D014867:Water; D002244:Carbon; D003300:Copper; D013691:Tellurium; C028337:cadmium telluride