Journal
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
Volume 39, Issue 11, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ppsc.202200093
Keywords
gold shell; lithium niobate nanoparticles; photothermia; plasmons; second harmonic generation
Funding
- ANR [ANR-17-CE24-0029-03]
- 2015-2020 French Contrat Plan Etat Region (Project E-TIME, SYMME)
- Agence Nationale de la Recherche (ANR) [ANR-17-CE24-0029] Funding Source: Agence Nationale de la Recherche (ANR)
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This study presents a method for preparing nanoparticles containing a lithium niobate core and a gold shell using a combination of seeded-growth and layer-by-layer approaches. The influence of three synthesis parameters on the nanoparticles' characteristics is studied, and the growth of the gold shell is investigated using various techniques. The optical and photothermal properties of the core-shell nanoparticles are also analyzed.
Nanoparticles (NPs) containing a lithium niobate (LiNbO3) core and a gold shell are prepared using a combination of seeded-growth and layer-by-layer approaches. The method includes first the surface charge reversal of lithium niobate with branched polyethyleimine, second, the electrostatic binding of gold seeds, and third, successive reduction steps of gold chloride onto the gold-seeded LiNbO3 NPs for the progressive and surface-directed growth of the gold shell. The influence of three synthesis parameters, namely, pH, initial density of gold seeds covering the lithium niobate core, and gold chloride concentration, on the NPs' characteristics (structural properties, plasmon band, surface charge, hydrodynamic diameter) is studied. The progress of the gold shell growth is investigated by X-ray photoelectron spectroscopy and time-of-flight secondary ion mass spectrometry. In addition, it is shown that LN@Au core-shell NPs can emit a second harmonic generation signal when excited by a femtosecond laser. Finally, photothermal properties are studied, showing an increase of temperature of 8.6 degrees C upon infrared excitation, with an estimated light-to-heat conversion efficiency of 40% and a specific absorption rate of 8000 W g(-1).
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