HAL will be down for maintenance from Friday, June 10 at 4pm through Monday, June 13 at 9am. More information
Skip to Main content Skip to Navigation
Journal articles

Long range self-organisations of small metallic nanocrystals for SERS detection of electrochemical reactions

Abstract : Gold electrodes were modified by silver and gold nanocrystals (NCs) that self-organize onto the surface. Their optical properties were explored by measuring electroreflectance spectra as a function of electrode potential. Below their oxidation potential, no shift of the reflectance maximum was observed for Ag NCs. This can be explained by a low inter-facial capacitance resulting from the impossibility for the electrolyte to penetrate into the hydrophobic layer created by the NCs dodecanethiol ligands. Conversely, a non-monotonous evolution was observed with the electrode potential for oleylamine capped Au NCs. This behavior is suggesting a less dense hydrophobic layer, allowing significant electrolyte penetration. Next, electroactive compounds were adsorbed on the the Au NCs assemblies and characterized by Raman spectroelectrochemistry. In the first system displaying a single electron transfer with no coupled chemical reaction, only the spectrum intensity changed, because oxidation generated a Raman resonant radical cation. The second study considered 4-nitrothiophenol, for which up to 6 electrons and 6 protons may be transferred. In this case, the nitro band disappeared upon reduction, and the spectrum displayed typical features of the formed 4-aminothiophenol.
Document type :
Journal articles
Complete list of metadata

Cited literature [49 references]  Display  Hide  Download

Contributor : Claire Fave Connect in order to contact the contributor
Submitted on : Wednesday, September 30, 2020 - 6:09:35 PM
Last modification on : Thursday, April 7, 2022 - 1:58:18 PM
Long-term archiving on: : Monday, January 4, 2021 - 8:36:24 AM


Files produced by the author(s)



Sihem Groni, Claire Fave, Bernd Schöllhorn, Lionel Chapus, Pierre Aubertin, et al.. Long range self-organisations of small metallic nanocrystals for SERS detection of electrochemical reactions. Journal of Electroanalytical Chemistry, Elsevier 2020, 872, pp., 114322. ⟨10.1016/j.jelechem.2020.114322⟩. ⟨hal-02954128⟩



Record views


Files downloads