journal article·2021-12-24

Dye-Sensitized Lanthanide-Doped Upconversion Nanoparticles for Water Detection in Organic Solvents

Zhongzheng Yu, Chang-Keun Lim, Wen Kiat Chan, Yu Chen, Wei Shao, Yan Zhang, Paras N. Prasad, Timothy Thatt Yang Tan

ACS Applied Nano Materials· Volume 4· Issue 12
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Abstract

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.
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Research context

OpenAlex topics: Luminescence and Fluorescent Materials · Luminescence Properties of Advanced Materials · Advanced biosensing and bioanalysis techniques

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Chemical and Biomedical Engineering, Nanyang Technological University, 637459 Singapore

Institute for Lasers, Photonics, Biophotonics and the Department of Chemistry, University at Buffalo, State University of New York, Buffalo, New York 14260, United States

Department of Chemical and Materials Engineering, School of Engineering and Digital Sciences, Nazarbayev University, Nur-Sultan City 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 and 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

Funding

National Natural Science Foundation of China · Ministry of Education of Singapore Tier 1 grant · Ministry of Education of Singapore Tier 3 grant · Shenzhen Basic Research Project

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