Monolayer and thin h -BN as substrates for electron spectro-microscopy analysis of plasmonic nanoparticles

Luiz Henrique Galvão Tizei; Hugo Lourenço-Martins; Pabitra Das; Steffi Y. Woo; Leonardo Scarabelli; Christoph Hanske; Luis M. Liz-Marzán; Kenji Watanabe; Takashi Taniguchi; Mathieu Kociak

doi:10.1063/1.5054751

Monolayer and thin h -BN as substrates for electron spectro-microscopy analysis of plasmonic nanoparticles

Luiz Henrique Galvão Tizei, Hugo Lourenço-Martins, Pabitra Das, Steffi Y. Woo, Leonardo Scarabelli, Christoph Hanske, Luis M. Liz-Marzán, Kenji Watanabe, Takashi Taniguchi, Mathieu Kociak

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

10 Scopus citations

Abstract

The influence of four substrates [thin Si₃N₄, few-layer graphene (FLG), thin h-BN, and monolayer h-BN] on plasmon resonances of metallic nanoparticles was studied using electron energy loss spectroscopy. The h-BN monolayer is an excellent substrate for the study of plasmonic particles due to its large bandgap, negligible charging under electron irradiation, and negligible influence on the plasmon resonance full width at half maximum and peak positions. These effects were evidenced in experiments with gold nanotriangles focusing on dipolar modes. Nanotriangles on h-BN exhibit the lowest influence from the substrate compared to Si₃N₄ and FLG. In a dataset containing 23 triangles of similar sizes, the dipolar mode was found to have smaller redshifts, sharper peak widths, and higher resonance quality factors on h-BN, showing that it has nearly no effect on the plasmon absorption properties, provided that it is free from carbon contamination. However, light emission (cathodoluminescence) decreases as a function of electron irradiation for triangles on h-BN, even though the electron energy loss signal stays unchanged. This indicates the creation of non-radiative decay channels.

Original language	English
Article number	231108
Journal	Applied Physics Letters
Volume	113
Issue number	23
DOIs	https://doi.org/10.1063/1.5054751
State	Published - Dec 3 2018
Externally published	Yes

Funding

This work was partially funded by National Agency for Research under the program of future investment TEMPOS-CHROMATEM with the reference ANR-10-EQPX-50. C.H. acknowledges funding from the Alexander von Humboldt Foundation through a Feodor Lynen Fellowship. Growth of hexagonal boron nitride crystals was supported by the Elemental Strategy Initiative conducted by the MEXT, Japan, and the CREST (JPMJCR15F3), JST.

Funders	Funder number
ANR-10-EQPX-50
National Agency for Research
Alexander von Humboldt-Stiftung
Ministry of Education, Culture, Sports, Science and Technology
Japan Science and Technology Agency
Core Research for Evolutional Science and Technology	JPMJCR15F3

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title = "Monolayer and thin h -BN as substrates for electron spectro-microscopy analysis of plasmonic nanoparticles",

abstract = "The influence of four substrates [thin Si3N4, few-layer graphene (FLG), thin h-BN, and monolayer h-BN] on plasmon resonances of metallic nanoparticles was studied using electron energy loss spectroscopy. The h-BN monolayer is an excellent substrate for the study of plasmonic particles due to its large bandgap, negligible charging under electron irradiation, and negligible influence on the plasmon resonance full width at half maximum and peak positions. These effects were evidenced in experiments with gold nanotriangles focusing on dipolar modes. Nanotriangles on h-BN exhibit the lowest influence from the substrate compared to Si3N4 and FLG. In a dataset containing 23 triangles of similar sizes, the dipolar mode was found to have smaller redshifts, sharper peak widths, and higher resonance quality factors on h-BN, showing that it has nearly no effect on the plasmon absorption properties, provided that it is free from carbon contamination. However, light emission (cathodoluminescence) decreases as a function of electron irradiation for triangles on h-BN, even though the electron energy loss signal stays unchanged. This indicates the creation of non-radiative decay channels.",

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doi = "10.1063/1.5054751",

language = "English",

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AU - Tizei, Luiz Henrique Galvão

AU - Lourenço-Martins, Hugo

AU - Das, Pabitra

AU - Woo, Steffi Y.

AU - Scarabelli, Leonardo

AU - Hanske, Christoph

AU - Liz-Marzán, Luis M.

AU - Watanabe, Kenji

AU - Taniguchi, Takashi

AU - Kociak, Mathieu

PY - 2018/12/3

Y1 - 2018/12/3

N2 - The influence of four substrates [thin Si3N4, few-layer graphene (FLG), thin h-BN, and monolayer h-BN] on plasmon resonances of metallic nanoparticles was studied using electron energy loss spectroscopy. The h-BN monolayer is an excellent substrate for the study of plasmonic particles due to its large bandgap, negligible charging under electron irradiation, and negligible influence on the plasmon resonance full width at half maximum and peak positions. These effects were evidenced in experiments with gold nanotriangles focusing on dipolar modes. Nanotriangles on h-BN exhibit the lowest influence from the substrate compared to Si3N4 and FLG. In a dataset containing 23 triangles of similar sizes, the dipolar mode was found to have smaller redshifts, sharper peak widths, and higher resonance quality factors on h-BN, showing that it has nearly no effect on the plasmon absorption properties, provided that it is free from carbon contamination. However, light emission (cathodoluminescence) decreases as a function of electron irradiation for triangles on h-BN, even though the electron energy loss signal stays unchanged. This indicates the creation of non-radiative decay channels.

AB - The influence of four substrates [thin Si3N4, few-layer graphene (FLG), thin h-BN, and monolayer h-BN] on plasmon resonances of metallic nanoparticles was studied using electron energy loss spectroscopy. The h-BN monolayer is an excellent substrate for the study of plasmonic particles due to its large bandgap, negligible charging under electron irradiation, and negligible influence on the plasmon resonance full width at half maximum and peak positions. These effects were evidenced in experiments with gold nanotriangles focusing on dipolar modes. Nanotriangles on h-BN exhibit the lowest influence from the substrate compared to Si3N4 and FLG. In a dataset containing 23 triangles of similar sizes, the dipolar mode was found to have smaller redshifts, sharper peak widths, and higher resonance quality factors on h-BN, showing that it has nearly no effect on the plasmon absorption properties, provided that it is free from carbon contamination. However, light emission (cathodoluminescence) decreases as a function of electron irradiation for triangles on h-BN, even though the electron energy loss signal stays unchanged. This indicates the creation of non-radiative decay channels.

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Monolayer and thin h -BN as substrates for electron spectro-microscopy analysis of plasmonic nanoparticles

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