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

By Jacek Kozuch, N. Petrusch, Dimitra Gkogkou, Ulrich Gernert and Inez M. Weidinger

Abstract

Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG geförderten) Allianz- bzw. Nationallizenz frei zugänglich.This publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence (funded by the DFG, German Research Foundation) respectively.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.DFG, EXC 314, Unifying Concepts in CatalysisDFG, GSC 1013, School of Analytical Sciences Adlershof (SALSA

Topics: 540 Chemie und zugeordnete Wissenschaften
Year: 2015
DOI identifier: 10.1039/c4cp05015k
OAI identifier: oai:depositonce.tu-berlin.de:11303/6943
Provided by: DepositOnce
Journal:

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