Magnetic interactions in Spin-labeled Au nanoparticles

V. Lloveras; E. Badetti; V. Chechik; J. Vidal-Gancedo

doi:10.1021/jp505231w

Magnetic interactions in Spin-labeled Au nanoparticles

V. Lloveras, E. Badetti, V. Chechik^*, J. Vidal-Gancedo

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

A series of gold nanoparticles functionalized with TEMPO-modified disulfide 2 have been prepared and studied by electron paramagnetic resonance (EPR) spectroscopy, UV-vis, transmission electron microscopy (TEM), energy dispersive X-ray analysis (EDX), and thermogravimetric analysis (TGA). In order to increase the packing of spin labels on the particle surface, heat-induced size evolution and ligand exchange reactions were used. The optimized synthesis included a one-pot reaction at room temperature that led to gold nanoparticles with a controlled large size (ca. 7 nm) and high coverage of radicals. These nanoparticles showed a |Δm_s| = 2 transition at half-field, which gives direct evidence of the presence of a high-spin state and permits an EPR study of the nature of the magnetic coupling between the spins. The results showed dominant antiferromagnetic interactions between radicals, but at lower temperatures, a ferromagnetic contribution was observed.

Original language	English
Pages (from-to)	21622-21629
Number of pages	8
Journal	Journal of Physical Chemistry C
Volume	118
Issue number	37
Early online date	5 Sep 2014
DOIs	https://doi.org/10.1021/jp505231w
Publication status	Published - 18 Sep 2014

Access to Document

10.1021/jp505231w

Cite this

@article{969501bb3aa74b87ad4643492b3a3b19,

title = "Magnetic interactions in Spin-labeled Au nanoparticles",

abstract = "A series of gold nanoparticles functionalized with TEMPO-modified disulfide 2 have been prepared and studied by electron paramagnetic resonance (EPR) spectroscopy, UV-vis, transmission electron microscopy (TEM), energy dispersive X-ray analysis (EDX), and thermogravimetric analysis (TGA). In order to increase the packing of spin labels on the particle surface, heat-induced size evolution and ligand exchange reactions were used. The optimized synthesis included a one-pot reaction at room temperature that led to gold nanoparticles with a controlled large size (ca. 7 nm) and high coverage of radicals. These nanoparticles showed a |Δms| = 2 transition at half-field, which gives direct evidence of the presence of a high-spin state and permits an EPR study of the nature of the magnetic coupling between the spins. The results showed dominant antiferromagnetic interactions between radicals, but at lower temperatures, a ferromagnetic contribution was observed.",

author = "V. Lloveras and E. Badetti and V. Chechik and J. Vidal-Gancedo",

year = "2014",

month = sep,

day = "18",

doi = "10.1021/jp505231w",

language = "English",

volume = "118",

pages = "21622--21629",

journal = "Journal of Physical Chemistry C",

issn = "1932-7447",

publisher = "American Chemical Society",

number = "37",

}

TY - JOUR

T1 - Magnetic interactions in Spin-labeled Au nanoparticles

AU - Lloveras, V.

AU - Badetti, E.

AU - Chechik, V.

AU - Vidal-Gancedo, J.

PY - 2014/9/18

Y1 - 2014/9/18

N2 - A series of gold nanoparticles functionalized with TEMPO-modified disulfide 2 have been prepared and studied by electron paramagnetic resonance (EPR) spectroscopy, UV-vis, transmission electron microscopy (TEM), energy dispersive X-ray analysis (EDX), and thermogravimetric analysis (TGA). In order to increase the packing of spin labels on the particle surface, heat-induced size evolution and ligand exchange reactions were used. The optimized synthesis included a one-pot reaction at room temperature that led to gold nanoparticles with a controlled large size (ca. 7 nm) and high coverage of radicals. These nanoparticles showed a |Δms| = 2 transition at half-field, which gives direct evidence of the presence of a high-spin state and permits an EPR study of the nature of the magnetic coupling between the spins. The results showed dominant antiferromagnetic interactions between radicals, but at lower temperatures, a ferromagnetic contribution was observed.

AB - A series of gold nanoparticles functionalized with TEMPO-modified disulfide 2 have been prepared and studied by electron paramagnetic resonance (EPR) spectroscopy, UV-vis, transmission electron microscopy (TEM), energy dispersive X-ray analysis (EDX), and thermogravimetric analysis (TGA). In order to increase the packing of spin labels on the particle surface, heat-induced size evolution and ligand exchange reactions were used. The optimized synthesis included a one-pot reaction at room temperature that led to gold nanoparticles with a controlled large size (ca. 7 nm) and high coverage of radicals. These nanoparticles showed a |Δms| = 2 transition at half-field, which gives direct evidence of the presence of a high-spin state and permits an EPR study of the nature of the magnetic coupling between the spins. The results showed dominant antiferromagnetic interactions between radicals, but at lower temperatures, a ferromagnetic contribution was observed.

UR - http://www.scopus.com/inward/record.url?scp=84912548180&partnerID=8YFLogxK

U2 - 10.1021/jp505231w

DO - 10.1021/jp505231w

M3 - Article

AN - SCOPUS:84912548180

VL - 118

SP - 21622

EP - 21629

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

SN - 1932-7447

IS - 37

ER -

Magnetic interactions in Spin-labeled Au nanoparticles

Abstract

Access to Document

Other files and links

Cite this