Dye-Sensitized Lanthanide-Doped Upconversion Nanoparticles for Water Detection in Organic Solvents
Yu Z. Lim C.-K. Chan W.K. Chen Y. Shao W. Zhang Y. Prasad P.N. Tan T.T.Y.
24 December 2021American Chemical Society
ACS Applied Nano Materials
2021#4Issue 1214069 - 14076 pp.
The use of fluorescent probes to detect water content in organic solvents is highly desirable in chemical industries. Optimal fluorescent probes are expected to achieve rapid tests with a high sensitivity. Most existing fluorescent probes use water as a quencher to turn off the fluorescence and are not able to detect water in very low concentrations. We report a nanoformulation containing lanthanide-doped upconversion nanoparticles (UCNPs) coated with a very high concentration of ICG to detect water content in organic solvents via a turn-on process with an ultrahigh sensitivity at the ppm level. It is based on our unexpected observation that UCNPs coupled to a high concentration of ICG dye and dispersed in an organic solvent exhibit enhancement of emission upon addition of water. A turn-off detection process can also be achieved when the water content is higher (>0.2% v/v, 2000 ppm). We propose the underlying sensitization mechanism as involving the interaction of polar water with ICG, influencing the quenching between dye molecules and energy transfer from dye molecules to UCNPs. We hope our approach could provide a guide for the design of fluorescent nanosensors for water detection in organic solvents and also deepen the understanding of the energy transfer processes from organic dye to UCNPs.
dye-sensitized , lanthanide-doped upconversion nanoparticles , turn-on , ultrasensitive , water detection
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School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore, 637459, Singapore
Institute for Lasers, Photonics, Biophotonics, Department of Chemistry, University at Buffalo, State University of New York, Buffalo, 14260, NY, United States
Department of Chemical and Materials Engineering, School of Engineering and Digital Sciences, Nazarbayev University, Nur-Sultan, 010000, Kazakhstan
Center for Biomedical Optics and Photonics (CBOP), College of Physics and Optoelectronic Engineering, Key Laboratory of Optoelectronic Devices and Systems, Shenzhen University, Shenzhen, 518060, China
College of Chemical Engineering, State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology, Zhejiang University of Technology, Hangzhou, 310014, China
College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, 430074, China
School of Chemical and Biomedical Engineering
Institute for Lasers
Department of Chemical and Materials Engineering
Center for Biomedical Optics and Photonics (CBOP)
College of Chemical Engineering
College of Life Science and Technology
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