Engineering Bright and Mechanosensitive Alkaline-Earth Rare-Earth Upconverting Nanoparticles.

Autor: McLellan CA; Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, United States., Siefe C; Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, United States., Casar JR; Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, United States., Peng CS; Department of Physics, Stanford University, Stanford, California 94305, United States.; Department of Molecular and Cellular Physiology, Stanford University, Stanford, California 94305, United States., Fischer S; Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, United States., Lay A; Department of Applied Physics, Stanford University, Stanford, California 94305, United States., Parakh A; Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, United States., Ke F; Department of Geological Sciences, Stanford University, Stanford, California 94305, United States., Gu XW; Department of Mechanical Engineering, Stanford University, Stanford, California 94305, United States., Mao W; Department of Geological Sciences, Stanford University, Stanford, California 94305, United States., Chu S; Department of Physics, Stanford University, Stanford, California 94305, United States.; Department of Molecular and Cellular Physiology, Stanford University, Stanford, California 94305, United States., Goodman MB; Department of Molecular and Cellular Physiology, Stanford University, Stanford, California 94305, United States., Dionne JA; Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, United States.; Department of Radiology, Stanford University, Stanford, California 94305, United States.
Jazyk: angličtina
Zdroj: The journal of physical chemistry letters [J Phys Chem Lett] 2022 Feb 17; Vol. 13 (6), pp. 1547-1553. Date of Electronic Publication: 2022 Feb 08.
DOI: 10.1021/acs.jpclett.1c03841
Abstrakt: Upconverting nanoparticles (UCNPs) are an emerging platform for mechanical force sensing at the nanometer scale. An outstanding challenge in realizing nanometer-scale mechano-sensitive UCNPs is maintaining a high mechanical force responsivity in conjunction with bright optical emission. This Letter reports mechano-sensing UCNPs based on the lanthanide dopants Yb 3+ and Er 3+ , which exhibit a strong ratiometric change in emission spectra and bright emission under applied pressure. We synthesize and analyze the pressure response of five different types of nanoparticles, including cubic NaYF 4 host nanoparticles and alkaline-earth host materials CaLuF, SrLuF, SrYbF, and BaLuF, all with lengths of 15 nm or less. By combining optical spectroscopy in a diamond anvil cell with single-particle brightness, we determine the noise equivalent sensitivity (GPa/√Hz) of these particles. The SrYb 0.72 Er 0.28 F@SrLuF particles exhibit an optimum noise equivalent sensitivity of 0.26 ± 0.04 GPa/√Hz. These particles present the possibility of robust nanometer-scale mechano-sensing.
Databáze: MEDLINE
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