Calculating average surface enhancement factors of randomly nanostructured electrodes by a combination of SERS and impedance spectroscopy

Kozuch J, Petrusch N, Gkogkou D, Gernert U, Weidinger IM (2015)

Publication Type: Journal article

Publication year: 2015

Journal

Physical Chemistry Chemical Physics Royal Society of Chemistry

Book Volume: 17

Pages Range: 21220-21225

Journal Issue: 33

DOI: 10.1039/c4cp05015k

Abstract

Polyhedron Ag nanostructures were created on top of a polished Au electrode via step-wise electrodeposition and tested as substrates for SERS spectroscopy. Average Raman enhancement factors were derived by combining SERS measurements with electrochemical impedance spectroscopy (EIS), which is able to determine the electroactive surface area of a randomly nanostructured surface. Depending on the deposition step an alternating increase and decrease of surface area was observed while the SERS intensity showed a clear maximum for the first deposition cycle. SEM pictures reveal the formation of Ag polyhedrons that are randomly dispersed on the Au surface. Furthermore the presence of a sub nanostructure on top of the polyhedron after the first deposition cycle is observed which becomes smoother after subsequent deposition cycles. Correlating the SEM pictures with SERS and EIS measurements it is concluded that the coral-like sub nanostructure is dominating the enhancement factor while the polyhedron structure itself only plays a minor role for electromagnetic field enhancement.

Involved external institutions

Technische Universität Berlin DE Germany (DE)

How to cite

APA:

Kozuch, J., Petrusch, N., Gkogkou, D., Gernert, U., & Weidinger, I.M. (2015). Calculating average surface enhancement factors of randomly nanostructured electrodes by a combination of SERS and impedance spectroscopy. Physical Chemistry Chemical Physics, 17(33), 21220-21225. https://dx.doi.org/10.1039/c4cp05015k

MLA:

Kozuch, Jacek, et al. "Calculating average surface enhancement factors of randomly nanostructured electrodes by a combination of SERS and impedance spectroscopy." Physical Chemistry Chemical Physics 17.33 (2015): 21220-21225.

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