In this work the electrochemical functionalization of polycrystalline gold with a nitro-phenyl layer has been studied. The surface modification has been performed by cyclic voltammetries through the electroreduction of 4-nitrobenzenediazonium salt (NBD) using as solvent the ionic liquid 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl) imide ([BMP][TFSA]). The presence of phenyl groups on the electrode surface was studied by cyclic voltammetry and electrochemical impedance spectroscopy (EIS). The barrier propriety of nitro-phenyl modified gold surfaces were characterized by EIS using Fe(CN)6 3- / Fe(CN)6 4- as a redox probe. The results indicate that nitro-phenyl groups are present on gold surface. The increase in the scan rate during the reduction of NBD in ionic liquid leads to a less covered surface as indicated by a decrease in the charge transfer resistance for the redox probe. Moreover, using the ionic liquid as solvent, lower amount of the attached molecules and a less dense layer are obtained.

Functionalization of polycrystalline gold through the electroreduction of aryldiazonium salts in ionic liquids

VACCA, ANNALISA;MASCIA, MICHELE;RIZZARDINI, SIMONE;PALMAS, SIMONETTA;BARBARO, MASSIMO
2014-01-01

Abstract

In this work the electrochemical functionalization of polycrystalline gold with a nitro-phenyl layer has been studied. The surface modification has been performed by cyclic voltammetries through the electroreduction of 4-nitrobenzenediazonium salt (NBD) using as solvent the ionic liquid 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl) imide ([BMP][TFSA]). The presence of phenyl groups on the electrode surface was studied by cyclic voltammetry and electrochemical impedance spectroscopy (EIS). The barrier propriety of nitro-phenyl modified gold surfaces were characterized by EIS using Fe(CN)6 3- / Fe(CN)6 4- as a redox probe. The results indicate that nitro-phenyl groups are present on gold surface. The increase in the scan rate during the reduction of NBD in ionic liquid leads to a less covered surface as indicated by a decrease in the charge transfer resistance for the redox probe. Moreover, using the ionic liquid as solvent, lower amount of the attached molecules and a less dense layer are obtained.
2014
978-88-95608-32-7
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11584/106647
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 2
  • ???jsp.display-item.citation.isi??? ND
social impact