Local desorption of thiols by scanning electrochemical microscopy: patterning and tuning the reactivity of self-assembled monolayers

Andrea Fiorani, Stefania Rapino, Giulia Fioravanti, Giovanni Valenti, Massimo Marcaccio, Francesco Paolucci

Research output: Contribution to journalArticlepeer-review

Abstract

Self-assembled monolayers (SAMs) are widely used in the field of nanotechnologies and (bio)sensors. The monolayer surface properties are tailored by employing several techniques. A large set of SAM post-modification routes are commonly performed to adapt them to a variety of nano-technological and bio-technological studies as well as to several bio-sensoristic applications. Here, we report a procedure to locally modify SAMs by electrochemical desorption of alkanethiols in order to create microsized spots of bare gold area without affecting the surrounding monolayer stability. The tip of the scanning electrochemical microscope (SECM) was employed to draw microstructured pattern according to a defined geometry. The time stability of the pattern was also tested. Furthermore, the patterned surface was post-functionalized using the same alkanethiol or a ferrocene-terminated thiol, in order to tune the surface reactivity of the microstructure. The local surface properties, including reactivity and electron transfer kinetics toward redox mediator reduction, were characterized by SECM.

Original languageEnglish
JournalJournal of Solid State Electrochemistry
DOIs
Publication statusAccepted/In press - Aug 27 2015

Keywords

  • Local thiol desorption
  • Microstructured surfaces
  • Scanning electrochemical microscopy
  • Scanning probe microscopy
  • Self-assembled monolayer

ASJC Scopus subject areas

  • Electrochemistry
  • Electrical and Electronic Engineering
  • Condensed Matter Physics
  • Materials Science(all)

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