Control of gas phase nanoparticle shape and its effect on MRI relaxivity

Sitki Aktaş; Stuart C. Thornton; Chris Binns; Leonardo Lari; Andrew Pratt; Roland Kröger; Mark A. Horsfield

doi:10.1088/2053-1591/2/3/035002

Control of gas phase nanoparticle shape and its effect on MRI relaxivity

Sitki Aktaş, Stuart C. Thornton, Chris Binns, Leonardo Lari, Andrew Pratt, Roland Kröger, Mark A. Horsfield

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

Abstract

We have used a sputtering gas aggregation source to produce Fe@FeO nanoparticles with different shapes, by annealing them at different temperatures in the gas phase. Without annealing, the most common shape found for the nanoparticles is cubic but annealing the nanoparticles at 1129 °C transforms the cubes into cuboctahedra. Measurements of the MRI relaxivity show that the cubic nanoparticles have a higher performance by a factor of two, which is attributed to a higher saturation magnetization for this shape. This indicates that the shape-control enabled by gas-phase synthesis is important for obtaining optimal performance in applications.

Original language	English
Article number	035002
Number of pages	7
Journal	Materials Research Express
Volume	2
Issue number	3
Early online date	17 Feb 2015
DOIs	https://doi.org/10.1088/2053-1591/2/3/035002
Publication status	Published - 17 Feb 2015

Keywords

Nanoparticle shape control
MRI relaxivity
Core-shell nanoparticles

Access to Document

10.1088/2053-1591/2/3/035002

Cite this

@article{76bd90b428074244b4b24e398924ad51,

title = "Control of gas phase nanoparticle shape and its effect on MRI relaxivity",

abstract = "We have used a sputtering gas aggregation source to produce Fe@FeO nanoparticles with different shapes, by annealing them at different temperatures in the gas phase. Without annealing, the most common shape found for the nanoparticles is cubic but annealing the nanoparticles at 1129 °C transforms the cubes into cuboctahedra. Measurements of the MRI relaxivity show that the cubic nanoparticles have a higher performance by a factor of two, which is attributed to a higher saturation magnetization for this shape. This indicates that the shape-control enabled by gas-phase synthesis is important for obtaining optimal performance in applications.",

keywords = "Nanoparticle shape control, MRI relaxivity, Core-shell nanoparticles",

author = "Sitki Akta{\c s} and Thornton, {Stuart C.} and Chris Binns and Leonardo Lari and Andrew Pratt and Roland Kr{\"o}ger and Horsfield, {Mark A.}",

year = "2015",

month = feb,

day = "17",

doi = "10.1088/2053-1591/2/3/035002",

language = "English",

volume = "2",

journal = "Materials Research Express",

issn = "2053-1591",

publisher = "IOP Publishing",

number = "3",

}

TY - JOUR

T1 - Control of gas phase nanoparticle shape and its effect on MRI relaxivity

AU - Aktaş, Sitki

AU - Thornton, Stuart C.

AU - Binns, Chris

AU - Lari, Leonardo

AU - Pratt, Andrew

AU - Kröger, Roland

AU - Horsfield, Mark A.

PY - 2015/2/17

Y1 - 2015/2/17

N2 - We have used a sputtering gas aggregation source to produce Fe@FeO nanoparticles with different shapes, by annealing them at different temperatures in the gas phase. Without annealing, the most common shape found for the nanoparticles is cubic but annealing the nanoparticles at 1129 °C transforms the cubes into cuboctahedra. Measurements of the MRI relaxivity show that the cubic nanoparticles have a higher performance by a factor of two, which is attributed to a higher saturation magnetization for this shape. This indicates that the shape-control enabled by gas-phase synthesis is important for obtaining optimal performance in applications.

AB - We have used a sputtering gas aggregation source to produce Fe@FeO nanoparticles with different shapes, by annealing them at different temperatures in the gas phase. Without annealing, the most common shape found for the nanoparticles is cubic but annealing the nanoparticles at 1129 °C transforms the cubes into cuboctahedra. Measurements of the MRI relaxivity show that the cubic nanoparticles have a higher performance by a factor of two, which is attributed to a higher saturation magnetization for this shape. This indicates that the shape-control enabled by gas-phase synthesis is important for obtaining optimal performance in applications.

KW - Nanoparticle shape control

KW - MRI relaxivity

KW - Core-shell nanoparticles

UR - http://www.scopus.com/inward/record.url?scp=84953378160&partnerID=8YFLogxK

U2 - 10.1088/2053-1591/2/3/035002

DO - 10.1088/2053-1591/2/3/035002

M3 - Article

AN - SCOPUS:84953378160

SN - 2053-1591

VL - 2

JO - Materials Research Express

JF - Materials Research Express

IS - 3

M1 - 035002

ER -

Control of gas phase nanoparticle shape and its effect on MRI relaxivity

Abstract

Keywords

Access to Document

Other files and links

Cite this