Title: X-ray Absorption Spectroscopy for measuring the Thermo-Optical Properties of branched Au nanoparticles (Talk)
Authors: 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
Issue Date: 2012
Conference: E-MRS meeting (European Materialss Science Society) location:Strasbourg, France date:May 2012

Bieke Van de Broek2,3, Didier Grandjean1, Jesse Trekker2, Jian Ye2,3,
Kris Verstreken2, Guido Maes3, Gustaaf Borghs3, Sergey Nikitenko4,
Liesbet Lagae1,2, Carmen Bartic1,2, Kristiaan Temst5, and Margriet J. Van Bael1

1 Laboratory of Solid State Physics and Magnetism, KU Leuven,
Celestijnenlaan 200D, 3001 Leuven (Belgium)
2 imec, Bio-Nano Electronics, Functional Nanosystems,
Kapeldreef 75, 3001 Leuven (Belgium)
3 Department of Chemistry, Quantum Chemistry and Physical Chemistry, KU Leuven, Celestijnenlaan 200F, 3001 Leuven (Belgium)
4 DUBBLE CRG/ESRF, BP 220, 38043 Grenoble Cedex (France)
5 Instituut voor Kern- en Stralingsfysica, KU Leuven,
Celestijnenlaan 200D, 3001 Leuven (Belgium)

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.
Publication status: published
KU Leuven publication type: IMa
Appears in Collections:Solid State Physics and Magnetism Section
Quantum Chemistry and Physical Chemistry Section
Biomedical MRI
Semiconductor Physics Section
Nuclear and Radiation Physics Section

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