Studying the localized deposition of Ag nanoparticles on self-assembled monolayers by scanning electrochemical microscopy (SECM)

Esteban Malel, John Colleran, Daniel Mandler*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

The local deposition of Ag nanoparticles (NPs) on ω-mercaptoalkanoic acid, HS(CH2)nCO2H, (n = 2, 10) self-assembled monolayers (SAMs) by scanning electrochemical microscopy (SECM) is reported. We found that the presence of a SAM had a pronounced effect on Ag deposition. Experiments were conducted by applying different potentials to an Au(1 1 1) substrate either in the presence of a constant concentration of Ag+ ions in solution (bulk deposition) or by generating a flux of Ag+ from an Ag microelectrode that was positioned close to the Au(1 1 1) substrate (SECM deposition). SECM was used for generating a controlled flux of silver ions by anodic dissolution of an Ag microelectrode close to the SAMs modified Au(1 1 1). We found that the shape of the NPs was affected by the length of the carbon-chain of the SAM. Tetrahedral NPs were obtained on bare Au(1 1 1) surfaces while rod like and cubic Ag NPs were deposited onto 3-mercaptopropanoic acid (MPA) and 11-mercaptoundecanoic acid (MUA) SAMs, respectively. The size and shape of the deposited NPs were influenced by the deposition potential. We conclude that the shape and distribution of locally deposited Ag NPs on Au(1 1 1) can be controlled by modification of the substrate with a SAM and through controlling the Ag+ flux generated by SECM.

Original languageAmerican English
Pages (from-to)6954-6961
Number of pages8
JournalElectrochimica Acta
Volume56
Issue number20
DOIs
StatePublished - 1 Aug 2011

Bibliographical note

Funding Information:
J. Colleran would like to express his sincere gratitude to Science Foundation Ireland ( SFI/06/RFP/EEB 006 STTF 08 ) for funding. This study was partially supported by the Binational Science Foundation (contract 2008039 ).

Keywords

  • Ag nanoparticles
  • Localized electrodeposition
  • Scanning electrochemical microscopy
  • Self assembled monolayer

Fingerprint

Dive into the research topics of 'Studying the localized deposition of Ag nanoparticles on self-assembled monolayers by scanning electrochemical microscopy (SECM)'. Together they form a unique fingerprint.

Cite this