Thermionic emission in gold nanoparticles under femtosecond laser irradiation observed with photoemission electron microscopy
This study reports that thermionic emission can dominate over multi-photon ionization in gold nanoparticles under femtosecond laser irradiation. The brightness of individual particles observed with photoemission electron microscopy increased steeply for laser power above 200 mW, which is reproduced...
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Online Access: | http://dx.doi.org/10.1063/1.5082772 |
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doaj-12c24a83ae934c76a2924015375f0f722020-11-24T21:51:13ZengAIP Publishing LLCAIP Advances2158-32262019-02-0192025112025112-810.1063/1.5082772041902ADVThermionic emission in gold nanoparticles under femtosecond laser irradiation observed with photoemission electron microscopyBochao Li0Chang Yang1Hao Li2Boyu Ji3Jingquan Lin4Toshihisa Tomie5School of Science, Changchun University of Science and Technology, No.7089, Weixing Road, Changchun 13022, ChinaSchool of Science, Changchun University of Science and Technology, No.7089, Weixing Road, Changchun 13022, ChinaSchool of Science, Changchun University of Science and Technology, No.7089, Weixing Road, Changchun 13022, ChinaSchool of Science, Changchun University of Science and Technology, No.7089, Weixing Road, Changchun 13022, ChinaSchool of Science, Changchun University of Science and Technology, No.7089, Weixing Road, Changchun 13022, ChinaSchool of Science, Changchun University of Science and Technology, No.7089, Weixing Road, Changchun 13022, ChinaThis study reports that thermionic emission can dominate over multi-photon ionization in gold nanoparticles under femtosecond laser irradiation. The brightness of individual particles observed with photoemission electron microscopy increased steeply for laser power above 200 mW, which is reproduced well by the Richardson–Dushman equation. The temperature estimated by fitting the equation is about 1 eV. This high temperature suggests that the laser is absorbed by defects. The difference in brightness among the nanoparticles as large as a few orders of magnitude is attributed to variation in the defect density. The particles having a similar temperature despite exhibiting largely varying brightness levels can be explained by slow energy transfer from the defects to the ambient electron gas. Discussions for interpreting the observed results suggest that thermionic emission can be a useful diagnostic tool for characterizing nanoparticles.http://dx.doi.org/10.1063/1.5082772 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Bochao Li Chang Yang Hao Li Boyu Ji Jingquan Lin Toshihisa Tomie |
spellingShingle |
Bochao Li Chang Yang Hao Li Boyu Ji Jingquan Lin Toshihisa Tomie Thermionic emission in gold nanoparticles under femtosecond laser irradiation observed with photoemission electron microscopy AIP Advances |
author_facet |
Bochao Li Chang Yang Hao Li Boyu Ji Jingquan Lin Toshihisa Tomie |
author_sort |
Bochao Li |
title |
Thermionic emission in gold nanoparticles under femtosecond laser irradiation observed with photoemission electron microscopy |
title_short |
Thermionic emission in gold nanoparticles under femtosecond laser irradiation observed with photoemission electron microscopy |
title_full |
Thermionic emission in gold nanoparticles under femtosecond laser irradiation observed with photoemission electron microscopy |
title_fullStr |
Thermionic emission in gold nanoparticles under femtosecond laser irradiation observed with photoemission electron microscopy |
title_full_unstemmed |
Thermionic emission in gold nanoparticles under femtosecond laser irradiation observed with photoemission electron microscopy |
title_sort |
thermionic emission in gold nanoparticles under femtosecond laser irradiation observed with photoemission electron microscopy |
publisher |
AIP Publishing LLC |
series |
AIP Advances |
issn |
2158-3226 |
publishDate |
2019-02-01 |
description |
This study reports that thermionic emission can dominate over multi-photon ionization in gold nanoparticles under femtosecond laser irradiation. The brightness of individual particles observed with photoemission electron microscopy increased steeply for laser power above 200 mW, which is reproduced well by the Richardson–Dushman equation. The temperature estimated by fitting the equation is about 1 eV. This high temperature suggests that the laser is absorbed by defects. The difference in brightness among the nanoparticles as large as a few orders of magnitude is attributed to variation in the defect density. The particles having a similar temperature despite exhibiting largely varying brightness levels can be explained by slow energy transfer from the defects to the ambient electron gas. Discussions for interpreting the observed results suggest that thermionic emission can be a useful diagnostic tool for characterizing nanoparticles. |
url |
http://dx.doi.org/10.1063/1.5082772 |
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