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3 October 2022 Improving stability and thermal sensitivity of an optically trapped upconversion nanoparticle by coating with a thermo-sensitive polymer
Dasheng Lu, Jorge Rubio Retama, Ricardo Marin, Manuel Marqués, Patricia Haro-González, Daniel Jaque
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Proceedings Volume PC12198, Optical Trapping and Optical Micromanipulation XIX; PC1219818 (2022) https://doi.org/10.1117/12.2633878
Event: SPIE Nanoscience + Engineering, 2022, San Diego, California, United States
Abstract
Lanthanide-based upconverting nanoparticles (UCNPs) boast low thermal sensitivity and brightness, which, along with the difficulty in controlling individual UCNP remotely, make them less than ideal nanothermometers at the single-particle level. In this work we show how these problems can be elegantly solved using a thermoresponsive polymeric coating. Upon decorating the surface of NaYF4:Er,Yb UCNPs with poly(N-isopropylacrylamide) (PNIPAM), a >10-fold enhancement in optical forces is observed, allowing stable trapping and manipulation of a single UCNP in the physiological temperature range (20-45 ºC). This optical force improvement is accompanied by a significant enhancement of the thermal sensitivity reaching a maximum value of 7 % °C-1 at 31.5 ºC caused by the temperature-induced collapse of PNIPAM.
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Dasheng Lu, Jorge Rubio Retama, Ricardo Marin, Manuel Marqués, Patricia Haro-González, and Daniel Jaque "Improving stability and thermal sensitivity of an optically trapped upconversion nanoparticle by coating with a thermo-sensitive polymer", Proc. SPIE PC12198, Optical Trapping and Optical Micromanipulation XIX, PC1219818 (3 October 2022); https://doi.org/10.1117/12.2633878
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KEYWORDS
Coating
Polymers
Nanoparticles
Thermography
Upconversion
Numerical simulations
Temperature metrology
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