Nanohalos: a manifestation of electron channelling in gold nanoparticles

Gary Ruben; Peng Wang; Adrian John D'Alfonso; Peter D Nellist; Leslie J Allen

doi:10.1016/j.ultramic.2012.06.002

Nanohalos: a manifestation of electron channelling in gold nanoparticles

Gary Ruben, Peng Wang, Adrian John D'Alfonso, Peter D Nellist, Leslie J Allen

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

Abstract

We discuss interesting haloing effects observed in experimental images of gold nanoparticles obtained using aberration-corrected scanning transmission electron microscopy (STEM) employing the low-angle annular dark-field (LAADF) imaging mode. The LAADF images contained bright rings of intensity (halos) with a diameter equal to or smaller than the diameter of the nanoparticle, the diameter varying as a function of the defocus of the STEM probe. Numerical simulations reveal that the halos are only present if the nanoparticles are imaged down a zone axis. Since the halos were observed in nearly all experimental images, this suggests that the nanoparticles become oriented along crystal zone axes during imaging.

Original language	English
Pages (from-to)	10-15
Number of pages	6
Journal	Ultramicroscopy
Volume	120
DOIs	https://doi.org/10.1016/j.ultramic.2012.06.002
Publication status	Published - Sept 2012
Externally published	Yes

Keywords

Imaging gold nanoparticles
Low-angle annular dark field (LAADF)
Scanning transmission electron microscopy (STEM)

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10.1016/j.ultramic.2012.06.002

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title = "Nanohalos: a manifestation of electron channelling in gold nanoparticles",

abstract = "We discuss interesting haloing effects observed in experimental images of gold nanoparticles obtained using aberration-corrected scanning transmission electron microscopy (STEM) employing the low-angle annular dark-field (LAADF) imaging mode. The LAADF images contained bright rings of intensity (halos) with a diameter equal to or smaller than the diameter of the nanoparticle, the diameter varying as a function of the defocus of the STEM probe. Numerical simulations reveal that the halos are only present if the nanoparticles are imaged down a zone axis. Since the halos were observed in nearly all experimental images, this suggests that the nanoparticles become oriented along crystal zone axes during imaging. ",

keywords = "Imaging gold nanoparticles, Low-angle annular dark field (LAADF), Scanning transmission electron microscopy (STEM)",

author = "Gary Ruben and Peng Wang and D'Alfonso, {Adrian John} and Nellist, {Peter D} and Allen, {Leslie J}",

year = "2012",

month = sep,

doi = "10.1016/j.ultramic.2012.06.002",

language = "English",

volume = "120",

pages = "10--15",

journal = "Ultramicroscopy",

issn = "0304-3991",

publisher = "Elsevier BV",

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TY - JOUR

T1 - Nanohalos

T2 - a manifestation of electron channelling in gold nanoparticles

AU - Ruben, Gary

AU - Wang, Peng

AU - D'Alfonso, Adrian John

AU - Nellist, Peter D

AU - Allen, Leslie J

PY - 2012/9

Y1 - 2012/9

N2 - We discuss interesting haloing effects observed in experimental images of gold nanoparticles obtained using aberration-corrected scanning transmission electron microscopy (STEM) employing the low-angle annular dark-field (LAADF) imaging mode. The LAADF images contained bright rings of intensity (halos) with a diameter equal to or smaller than the diameter of the nanoparticle, the diameter varying as a function of the defocus of the STEM probe. Numerical simulations reveal that the halos are only present if the nanoparticles are imaged down a zone axis. Since the halos were observed in nearly all experimental images, this suggests that the nanoparticles become oriented along crystal zone axes during imaging.

AB - We discuss interesting haloing effects observed in experimental images of gold nanoparticles obtained using aberration-corrected scanning transmission electron microscopy (STEM) employing the low-angle annular dark-field (LAADF) imaging mode. The LAADF images contained bright rings of intensity (halos) with a diameter equal to or smaller than the diameter of the nanoparticle, the diameter varying as a function of the defocus of the STEM probe. Numerical simulations reveal that the halos are only present if the nanoparticles are imaged down a zone axis. Since the halos were observed in nearly all experimental images, this suggests that the nanoparticles become oriented along crystal zone axes during imaging.

KW - Imaging gold nanoparticles

KW - Low-angle annular dark field (LAADF)

KW - Scanning transmission electron microscopy (STEM)

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U2 - 10.1016/j.ultramic.2012.06.002

DO - 10.1016/j.ultramic.2012.06.002

M3 - Article

SN - 0304-3991

VL - 120

SP - 10

EP - 15

JO - Ultramicroscopy

JF - Ultramicroscopy

ER -

Nanohalos: a manifestation of electron channelling in gold nanoparticles

Abstract

Keywords

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