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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 32: Focus Session: Novel Approaches to Surface Plasmon Generated Charges and Heat for Photocatalysis I (joint session O/CPP)
CPP 32.2: Talk
Wednesday, March 20, 2024, 15:30–15:45, MA 141
Single molecule layer temperature control via electrically connected SERS gratings — •Thorsten Feichtner1, Pooja Sutheeshnan2, Paul Mörk1, Enno Schatz3, and Bert Hecht1 — 1Nano- Optics & Biophotonics Group, Department of Experimental Physics 5, Röntgen Research Center for Complex Material Research (RCCM), Physics Institute, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany — 2School of Physics, IISER Thiruvananthapuram, India — 3NanoStruct GmbH, Friedrich-Bergius-Ring 15, 97076, Würzburg
It would be beneficial for photoelectrochemical experiments in microfluidic environments to be able to locally heat and directly measure the realized temperature. Surface enhanced Raman scattering can be used to locally measure the temperature of molecules, as the scattering peak heights depend on the probability density of vibrational states.
Here we provide evidence that our recently developed two wire grating SERS substrates [1] can be heated very locally using its Ohmic resistance. We measure its resulting temperature using the Raman peaks of a self-assembled monolayer of 4-MBA molecules in dependency of the heating current and fitting a probability density function approach. We back up the experiment with optical and heat simulations. This platform is ready to be implemented in microfluidic systems to measure SERS at the very same position where heat is applied.
[1] Sweedan, Amro, et al., arXiv preprint arXiv:2308.01395 (2023).
Keywords: SERS; Heating; plasmon; grating; Raman spectroscopy