Surface Modifications for Photon-Upconversion-Based Energy-Transfer Nanoprobes

被引:50
作者
Andresen, Elina [1 ,2 ]
Resch-Genger, Ute [1 ]
Schaeferling, Michael [3 ]
机构
[1] BAM Fed Inst Mat Res & Testing, Biophoton Div, Richard Willstatter Str 11, D-12489 Berlin, Germany
[2] Humboldt Univ, Dept Chem, Brook Taylor Str 2, D-12489 Berlin, Germany
[3] Munster Univ Appl Sci, Dept Chem Engn, Stegerwaldstr 39, D-48565 Steinfurt, Germany
关键词
UN TUNGSTATE MIXTE; UPCONVERTING NANOPARTICLES; IN-VIVO; LUMINESCENCE NANOPLATFORM; NAYF4; NANOCRYSTALS; OPTICAL-PROPERTIES; QUANTUM YIELDS; CARBOXY GROUPS; QUANTIFICATION; SIZE;
D O I
10.1021/acs.langmuir.9b00238
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
An emerging class of inorganic optical reporters are near infrared (NIR) excitable lanthanide-based upconversion nanoparticles (UCNPs) with multicolor emission and long luminescence lifetimes in the range of several hundred microseconds. For the design of chemical sensors and optical probes that reveal analyte-specific changes in their spectroscopic properties, these nanomaterials must be combined with sensitive indicator dyes that change their absorption and/or fluorescence properties selectively upon interaction with their target analyte, utilizing either resonance energy transfer (RET) processes or reabsorption-related inner filter effects. The rational development of UCNP-based nanoprobes for chemical sensing and imaging in a biological environment requires reliable methods for the surface functionalization of UCNPs, the analysis and quantification of surface groups, a high colloidal stability of UCNPs in aqueous media as well as the chemically stable attachment of the indicator molecules, and suitable instrumentation for the spectroscopic characterization of the energy-transfer systems and the derived nanosensors. These topics are highlighted in the following feature article, and examples of functionalized core-shell nanoprobes for the sensing of different biologically relevant analytes in aqueous environments will be presented. Special emphasis is placed on the intracellular sensing of pH.
引用
收藏
页码:5093 / 5113
页数:21
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