Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 54: Poster Session 3
CPP 54.43: Poster
Donnerstag, 3. April 2014, 15:00–19:00, P2
Interferometric measurements of photothermally induced local temperature changes inside solutions of functional gold nanoparticles — •Alexander Nedilko1, Malte Linn1, Anne Buchkremer2, Marco Schürings3, Ulrich Simon2, Alexander Böker3, and Gero von Plessen1 — 1Inst. of Physics (IA), RWTH Aachen — 2Inst. of Inorganic Chemistry, RWTH Aachen — 3Inst. of Physical Chemistry, RWTH Aachen
Metal-nanoparticle hybrid systems, such as DNA-gold nanoparticle (AuNP) networks and microgels with AuNP cores, have attracted great interest because of their unique optical properties and their versatile biomolecular and chemical functionalities. Since DNA dehybridization and microgel deswelling are temperature-sensitive, the AuNP hybrid systems can be switched between different states by photothermal heating via irradiation with cw laser light. In order to tailor these systems for possible future biomedical or nano-mechanical applications, it is crucial to investigate the laser induced thermal dynamics in the systems and in their vicinity. In this work, we measure the temper- ature increase inside different AuNP suspensions on a sub-millimeter length scale with a contact free, interferometric method, by exploiting the temperature dependent change of the refractive index of the solu- tion. By spectrally separating the heating and the probing lasers, we are able to measure the photothermally induced temperature increase with ca. 30mK resolution, while simultaneously following the laser in- duced switching of the AuNP systems by monitoring the scattered probe laser light intensity.