Phase separation on mixed-monolayer-protected metal nanoparticles: A study by infrared spectroscopy and scanning tunneling microscopy

Andrea Centrone, Ying Hu, Alicia M. Jackson, Giuseppe Zerbi, Francesco Stellacci

Research output: Contribution to journalArticlepeer-review

Abstract

The phase-separation on mixed-monolayer-protected metal Nanoparticles (NP) coated with mixtures of varying composition of 1-octanethiol and its fully denatured analogue (OT-d17) were analyzed by Infrared Spectroscopy (IRS) and Scanning Tunneling Microscopy (STM). The results show CH2 stretching frequencies as a function of composition for a series of NPs coated with OT and 3-mercaptopropionic acid (MPA). The intensity ratio between the antisymmetric MPA and the peaks in the entire CD stretching region of OT-d17 estimates show that the ligand-shell composition is in agreement with the syochiometric ratio used in synthesizing the NPs. The CH2 stretching frequencies versus composition provide evidence for homogeneous mixing and for phase separation in the ligand shell of monolayer-protected gold nanoparticles.

Original languageEnglish
Pages (from-to)814-817
Number of pages4
JournalSmall
Volume3
Issue number5
DOIs
Publication statusPublished - May 2007

Keywords

  • IR spectroscopy
  • Monolayers
  • Nanoparticles
  • Phase separation
  • Scanning tunneling microscopy

ASJC Scopus subject areas

  • Biomaterials
  • Engineering (miscellaneous)
  • Biotechnology
  • Medicine(all)

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