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New insights into micro/nanoscale combined probes (nanoAuger, uXPS) to characterize Ag/Au@SiO2 core–shell assemblies

New insights into micro/nanoscale combined probes (nanoAuger, uXPS) to characterize Ag/Au@SiO2 core–shell assemblies
New insights into micro/nanoscale combined probes (nanoAuger, uXPS) to characterize Ag/Au@SiO2 core–shell assemblies
This work has examined the elemental distribution and local morphology at the nanoscale of core@shell Ag/Au@SiO2 particles. The characterization of such complex metal/insulator materials becomes more efficient when using an initial cross-section method of preparation of the core@shell nanoparticles (ion milling cross polisher). The originality of this route of preparation allows one to obtain undamaged, well-defined and planar layers of cross-cut nano-objects. Once combined with high-resolution techniques of characterization (XPS, Auger and SEM), the process appears as a powerful way to minimize charging effects and enhance the outcoming electron signal (potentially affected by the topography of the material) during analysis. SEM experiments have unambiguously revealed the hollow-morphology of the metal core, while Auger spectroscopy observations showed chemical heterogeneity within the particles (as silver and gold are randomly found in the core ring). To our knowledge, this is the first time that Auger nano probe spectroscopy has been used and successfully optimized for the study of some complex metal/inorganic interfaces at such a high degree of resolution (?12 nm). Complementarily, XPS Au 4f and Ag 3d peaks were finally detected attesting the possibility of access to the whole chemistry of such nanostructured assemblies.
2040-3364
11130-11140
Ledeuil, J.B.
1c322c50-d345-4dbf-8efc-87852c6106dd
Uhart, A.
45caa4b1-ee0c-44ca-bba6-86f59cd716ed
Soule, S.
f5b1ff97-bf20-4adb-ba1d-357254158d8f
Allouche, J.
b8291762-b02d-438b-8df4-d95eb0c127c8
Dupin, J.C.
70f925ed-f21e-4323-8ddb-8ef4117de616
Martinez, H.
97856576-ee09-4b7a-bdb4-2ce649ac2dac
Ledeuil, J.B.
1c322c50-d345-4dbf-8efc-87852c6106dd
Uhart, A.
45caa4b1-ee0c-44ca-bba6-86f59cd716ed
Soule, S.
f5b1ff97-bf20-4adb-ba1d-357254158d8f
Allouche, J.
b8291762-b02d-438b-8df4-d95eb0c127c8
Dupin, J.C.
70f925ed-f21e-4323-8ddb-8ef4117de616
Martinez, H.
97856576-ee09-4b7a-bdb4-2ce649ac2dac

Ledeuil, J.B., Uhart, A., Soule, S., Allouche, J., Dupin, J.C. and Martinez, H. (2014) New insights into micro/nanoscale combined probes (nanoAuger, uXPS) to characterize Ag/Au@SiO2 core–shell assemblies. Nanoscale, 6 (19), 11130-11140. (doi:10.1039/c4nr03211j).

Record type: Article

Abstract

This work has examined the elemental distribution and local morphology at the nanoscale of core@shell Ag/Au@SiO2 particles. The characterization of such complex metal/insulator materials becomes more efficient when using an initial cross-section method of preparation of the core@shell nanoparticles (ion milling cross polisher). The originality of this route of preparation allows one to obtain undamaged, well-defined and planar layers of cross-cut nano-objects. Once combined with high-resolution techniques of characterization (XPS, Auger and SEM), the process appears as a powerful way to minimize charging effects and enhance the outcoming electron signal (potentially affected by the topography of the material) during analysis. SEM experiments have unambiguously revealed the hollow-morphology of the metal core, while Auger spectroscopy observations showed chemical heterogeneity within the particles (as silver and gold are randomly found in the core ring). To our knowledge, this is the first time that Auger nano probe spectroscopy has been used and successfully optimized for the study of some complex metal/inorganic interfaces at such a high degree of resolution (?12 nm). Complementarily, XPS Au 4f and Ag 3d peaks were finally detected attesting the possibility of access to the whole chemistry of such nanostructured assemblies.

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More information

Accepted/In Press date: 23 July 2014
e-pub ahead of print date: 25 July 2014
Organisations: Chemistry

Identifiers

Local EPrints ID: 403252
URI: http://eprints.soton.ac.uk/id/eprint/403252
ISSN: 2040-3364
PURE UUID: cb7003d5-ce77-4a0c-acfa-76c8ba4b41de

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Date deposited: 29 Nov 2016 11:14
Last modified: 28 Oct 2020 18:03

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