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Temperature Determination of Resonantly Excited Plasmonic Branched Gold Nanoparticles by X‐ray Absorption Spectroscopy
Author(s) -
Van de Broek Bieke,
Grandjean Didier,
Trekker Jesse,
Ye Jian,
Verstreken Kris,
Maes Guido,
Borghs Gustaaf,
Nikitenko Sergey,
Lagae Liesbet,
Bartic Carmen,
Temst Kristiaan,
Van Bael Margriet J.
Publication year - 2011
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201100089
Subject(s) - nanoparticle , materials science , plasmon , plasmonic nanoparticles , spectroscopy , photothermal therapy , colloidal gold , absorption spectroscopy , absorption (acoustics) , optoelectronics , analytical chemistry (journal) , nanotechnology , optics , chemistry , composite material , physics , chromatography , quantum mechanics
Abstract The fields of bioscience and nanomedicine demand precise thermometry for nanoparticle heat characterization down to the nanoscale regime. Since current methods often use indirect and less accurate techniques to determine the nanoparticle temperature, there is a pressing need for a direct and reliable element‐specific method. In‐situ extended X‐ray absorption fine structure (EXAFS) spectroscopy is used to determine the thermo‐optical properties of plasmonic branched gold nanoparticles upon resonant laser illumination. With EXAFS, the direct determination of the nanoparticle temperature increase upon laser illumination is possible via the thermal influence on the gold lattice parameters. More specifically, using the change of the Debye–Waller term representing the lattice disorder, the temperature increase is selectively measured within the plasmonic branched nanoparticles upon resonant laser illumination. In addition, the signal intensity shows that the nanoparticle concentration in the beam more than doubles during laser illumination, thereby demonstrating that photothermal heating is a dynamic process. A comparable temperature increase is measured in the nanoparticle suspension using a thermocouple. This good correspondence between the temperature at the level of the nanoparticle and at the level of the suspension points to an efficient heat transfer between the nanoparticle and the surrounding medium, thus confirming the potential of branched gold nanoparticles for hyperthermia applications. This work demonstrates that X‐ray absorption spectroscopy‐based nanothermometry could be a valuable tool in the fast‐growing number of applications of plasmonic nanoparticles, particularly in life sciences and medicine.