Thermally switchable plasmonic optical response of Au@PEtOx-stat-PBuOx core-shell nanoparticles with a tunable switching point
Abstract
The aqueous colloids of Au@PEtOx-stat-PBuOx (Au@PEtOx 1-x PBuOx x ) core-shell nanoparticles with a gold core (Au) and a shell formed by a thermoresponsive statistical copolymers α-methyl-ω-hydroxy poly(2-ethyl-2-oxazoline)-stat-poly(2-n-butyl-2-oxazoline) with various relative content of hydrophobic and hydrophilic units or α-methyl-ω-hydroxy poly(2-ethyl-2-oxazoline) (PEtOx) were synthesized as a potential platform for plasmonic based thermo-optical applications, thermally switchable optical absorbers in particular. Dynamic and electrophoretic light scattering, UV-Vis absorption, Raman scattering measurements as well as numerical simulation showed that the PEtOx-stat-PBuOx shell in Au@PEtOx 1-x PBuOx x nanoparticles undergoes a lower critical solution temperature (LCST) phase transition, which produces a sharp, switch-like change in the plasmonic optical response of the Au core. The LCST transition temperature was found to shift monotonically from 81 to 17 • C as the hydrophobic PBuOx content x increases from 0 to 0.3, passing through the physiological temperature of 37 • C at x = 0.19. The revealed effect of the precise and predictable tuning of the switching temperature by varying the ratio of the hydrophilic PEtOx and hydrophobic PBuOx components in the PEtOx-stat-PBuOx copolymer shell makes this system highly versatile for various temperature-controlled nanophotonic and biomedical applications.
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BibTeX
@article{yeshchenko2026thermally,
title = {{Thermally switchable plasmonic optical response of Au@PEtOx-stat-PBuOx core-shell nanoparticles with a tunable switching point}},
author = {Oleg Yeshchenko and Lea Daoud and Oles Fedotov and Pavlo Khort and Oksana Krupka},
journal = {Materials Today Communications},
year = {2026},
month = oct,
doi = {10.1016/j.mtcomm.2026.115748},
url = {https://hal.science/hal-05797288v1},
note = {CC BY-NC 4.0},
}
RIS
TY - JOUR
TI - Thermally switchable plasmonic optical response of Au@PEtOx-stat-PBuOx core-shell nanoparticles with a tunable switching point
AU - Oleg Yeshchenko
AU - Lea Daoud
AU - Oles Fedotov
AU - Pavlo Khort
AU - Oksana Krupka
PY - 2026
DA - 2026/10/13
JO - Materials Today Communications
DO - 10.1016/j.mtcomm.2026.115748
UR - https://hal.science/hal-05797288v1
AB - The aqueous colloids of Au@PEtOx-stat-PBuOx (Au@PEtOx 1-x PBuOx x ) core-shell nanoparticles with a gold core (Au) and a shell formed by a thermoresponsive statistical copolymers α-methyl-ω-hydroxy poly(2-ethyl-2-oxazoline)-stat-poly(2-n-butyl-2-oxazoline) with various relative content of hydrophobic and hydrophilic units or α-methyl-ω-hydroxy poly(2-ethyl-2-oxazoline) (PEtOx) were synthesized as a potential platform for plasmonic based thermo-optical applications, thermally switchable optical absorbers in particular. Dynamic and electrophoretic light scattering, UV-Vis absorption, Raman scattering measurements as well as numerical simulation showed that the PEtOx-stat-PBuOx shell in Au@PEtOx 1-x PBuOx x nanoparticles undergoes a lower critical solution temperature (LCST) phase transition, which produces a sharp, switch-like change in the plasmonic optical response of the Au core. The LCST transition temperature was found to shift monotonically from 81 to 17 • C as the hydrophobic PBuOx content x increases from 0 to 0.3, passing through the physiological temperature of 37 • C at x = 0.19. The revealed effect of the precise and predictable tuning of the switching temperature by varying the ratio of the hydrophilic PEtOx and hydrophobic PBuOx components in the PEtOx-stat-PBuOx copolymer shell makes this system highly versatile for various temperature-controlled nanophotonic and biomedical applications.
SN - 2352-4928
ER -