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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 40: Focus Session: Novel Approaches to Surface Plasmon Generated Charges and Heat for Photocatalysis II (joint session O/CPP)

CPP 40.4: Vortrag

Donnerstag, 21. März 2024, 11:30–11:45, MA 141

Electrochemistry at the surface of electrically connected plasmonic resonators — •Paul Mörk¹, Amro Sweedan², Muhammad Y. Bashouti², Bert Hecht¹, and Thorsten Feichtner¹ — ¹Nano-Optics & Biophotonics Group, Experimental Physics 5, University of Würzburg, Am Hubland, 97074 Würzburg, Germany — ²Ilse-Katz Institute for Nanoscale Science & Technology, Ben-Gurion University of Negrev, POB 653, Beer-Sheba Campus, Building 51, 8410501, Israel

Electrochemical reactions can be enhanced by catalytic processes at gold surfaces. Nanostructuring can lead to plasmonic resonances in the visible wavelength which may be used for photon routing, local heating or hot electron generation. This way it is possible to tailor the properties of gold for specific photo-electrochemical processes.

Here we discuss the use of electrically connected double-wire gratings as an effective plasmonic platform [1]. The gratings are fabricated from monocrystalline gold platelets via focused ion beam milling. We observe the electrochemical oxidation and reduction of these gold double-wire gratings at ambient conditions when applying voltages up to 10 V over gaps of 20 nm in width. We further show the dimerization of 4-aminothiophenol under continuous irradiation and the reverse reaction in presence of an applied voltage. Finally, we show a first implementation of the gratings as electrodes within nanofluidic channels for future applications as electrochemical cell.

[1] Sweedan, Amro, et al., arXiv preprint arXiv:2308.01395 (2023).

Keywords: SERS; plasmon; grating; electrochemistry