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

doi:10.1002/smll.200600736

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

Fondazione IRCCS Istituto Neurologico "C. Besta"

Research output: Contribution to journal › Article › peer-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 language	English
Pages (from-to)	814-817
Number of pages	4
Journal	Small
Volume	3
Issue number	5
DOIs	https://doi.org/10.1002/smll.200600736
Publication status	Published - 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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10.1002/smll.200600736

Cite this

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

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.",

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author = "Andrea Centrone and Ying Hu and Jackson, {Alicia M.} and Giuseppe Zerbi and Francesco Stellacci",

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T2 - A study by infrared spectroscopy and scanning tunneling microscopy

AU - Centrone, Andrea

AU - Hu, Ying

AU - Jackson, Alicia M.

AU - Zerbi, Giuseppe

AU - Stellacci, Francesco

PY - 2007/5

Y1 - 2007/5

N2 - 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.

AB - 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.

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KW - Nanoparticles

KW - Phase separation

KW - Scanning tunneling microscopy

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

Abstract

Keywords

ASJC Scopus subject areas

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