Study on surface enhanced Raman scattering of Au and Au@Al2O3 spherical dimers based on 3D finite element method

Abstract In this paper, the surface enhanced Raman scattering (SERS) characteristics of Au and Au@Al2O3 nanoparticle dimers were calculated and analyzed by using finite element method (3D-FEM). Firstly, the electric field enhancement factors of Au nanoparticles at the dimer gap were optimized from t...

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Autores principales:	Bao-xin Yan, Yan-ying Zhu, Yong Wei, Huan Pei
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/85ea3097f6124aa4bf7b6cacfc9a74c2
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spelling	oai:doaj.org-article:85ea3097f6124aa4bf7b6cacfc9a74c22021-12-02T14:26:20ZStudy on surface enhanced Raman scattering of Au and Au@Al2O3 spherical dimers based on 3D finite element method10.1038/s41598-021-87997-z2045-2322https://doaj.org/article/85ea3097f6124aa4bf7b6cacfc9a74c22021-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-87997-zhttps://doaj.org/toc/2045-2322Abstract In this paper, the surface enhanced Raman scattering (SERS) characteristics of Au and Au@Al2O3 nanoparticle dimers were calculated and analyzed by using finite element method (3D-FEM). Firstly, the electric field enhancement factors of Au nanoparticles at the dimer gap were optimized from three aspects: the incident angle of the incident light, the radius of nanoparticle and the distance of the dimer. Then, aluminum oxide is wrapped on the Au dimer. What is different from the previous simulation is that Al2O3 shell and Au core are regarded as a whole and the total radius of Au@Al2O3 dimer is controlled to remain unchanged. By comparing the distance of Au nucleus between Au and Au@Al2O3 dimer, it is found that the electric field enhancement factor of Au@Al2O3 dimer is much greater than that of Au dimer with the increase of Al2O3 thickness. The peak of electric field of Au@Al2O3 dimer moves towards the middle of the resonance peak of the two materials, and it is more concentrated than that of the Au dimer. The maximum electric field enhancement factor 583 is reached at the shell thickness of 1 nm. Our results provide a theoretical reference for the design of SERS substrate and the extension of the research scope.Bao-xin YanYan-ying ZhuYong WeiHuan PeiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Bao-xin Yan Yan-ying Zhu Yong Wei Huan Pei Study on surface enhanced Raman scattering of Au and Au@Al2O3 spherical dimers based on 3D finite element method
description	Abstract In this paper, the surface enhanced Raman scattering (SERS) characteristics of Au and Au@Al2O3 nanoparticle dimers were calculated and analyzed by using finite element method (3D-FEM). Firstly, the electric field enhancement factors of Au nanoparticles at the dimer gap were optimized from three aspects: the incident angle of the incident light, the radius of nanoparticle and the distance of the dimer. Then, aluminum oxide is wrapped on the Au dimer. What is different from the previous simulation is that Al2O3 shell and Au core are regarded as a whole and the total radius of Au@Al2O3 dimer is controlled to remain unchanged. By comparing the distance of Au nucleus between Au and Au@Al2O3 dimer, it is found that the electric field enhancement factor of Au@Al2O3 dimer is much greater than that of Au dimer with the increase of Al2O3 thickness. The peak of electric field of Au@Al2O3 dimer moves towards the middle of the resonance peak of the two materials, and it is more concentrated than that of the Au dimer. The maximum electric field enhancement factor 583 is reached at the shell thickness of 1 nm. Our results provide a theoretical reference for the design of SERS substrate and the extension of the research scope.
format	article
author	Bao-xin Yan Yan-ying Zhu Yong Wei Huan Pei
author_facet	Bao-xin Yan Yan-ying Zhu Yong Wei Huan Pei
author_sort	Bao-xin Yan
title	Study on surface enhanced Raman scattering of Au and Au@Al2O3 spherical dimers based on 3D finite element method
title_short	Study on surface enhanced Raman scattering of Au and Au@Al2O3 spherical dimers based on 3D finite element method
title_full	Study on surface enhanced Raman scattering of Au and Au@Al2O3 spherical dimers based on 3D finite element method
title_fullStr	Study on surface enhanced Raman scattering of Au and Au@Al2O3 spherical dimers based on 3D finite element method
title_full_unstemmed	Study on surface enhanced Raman scattering of Au and Au@Al2O3 spherical dimers based on 3D finite element method
title_sort	study on surface enhanced raman scattering of au and au@al2o3 spherical dimers based on 3d finite element method
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/85ea3097f6124aa4bf7b6cacfc9a74c2
work_keys_str_mv	AT baoxinyan studyonsurfaceenhancedramanscatteringofauandaual2o3sphericaldimersbasedon3dfiniteelementmethod AT yanyingzhu studyonsurfaceenhancedramanscatteringofauandaual2o3sphericaldimersbasedon3dfiniteelementmethod AT yongwei studyonsurfaceenhancedramanscatteringofauandaual2o3sphericaldimersbasedon3dfiniteelementmethod AT huanpei studyonsurfaceenhancedramanscatteringofauandaual2o3sphericaldimersbasedon3dfiniteelementmethod
_version_	1718391379413958656

Study on surface enhanced Raman scattering of Au and Au@Al2O3 spherical dimers based on 3D finite element method

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