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Study on Surface Enhanced Raman Scattering of Au and [email protected]2O3 Spherical Dimers Based on 3D Finite Element Method
Yong Wei
Yanshan University
Corresponding Author
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In this paper, the surface enhanced Raman scattering (SERS) characteristics of Au and [email protected]2O3 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 [email protected]2O3 dimer is controlled to remain unchanged. By comparing the distance of Au nucleus between Au and [email protected]2O3 dimer, it is found that the electric field enhancement factor of [email protected]2O3 dimer is much greater than that of Au dimer with the increase of Al2O3 thickness. The peak electric field of [email protected]2O3 dimer moves towards the middle of the resonance peak of the two materials, but the peak electric field of Au dimer is more concentrated than that of Au dimer, so that the excitation wavelength has less influence on Raman enhancement. 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.
Keywords
Surface enhanced Raman scattering, Local plasmon, Gold nanospheres, Core-shell nanoparticles, Finite element method
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This preprint is under consideration at Scientific Reports. A preprint is a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
Learn more about In Review
Research Article
Study on Surface Enhanced Raman Scattering of Au and [email protected]2O3 Spherical Dimers Based on 3D Finite Element Method
Yong Wei
Yanshan University
Corresponding Author
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
Peer Review Timeline
CURRENT STATUS: Under Revision
Version 1
Posted 28 Dec, 2020
No community comments so far
Editorial decision: Major revision
On 15 Jan, 2021
Review #5 received
Received 02 Jan, 2021
Review #4 received
Received 02 Jan, 2021
Review #7 received
Received 02 Jan, 2021
Review #1 received
Received 02 Jan, 2021
Review #3 received
Received 02 Jan, 2021
Review #6 received
Received 02 Jan, 2021
Review #2 received
Received 02 Jan, 2021
Reviewer #4 agreed
On 25 Dec, 2020
Reviewer #6 agreed
On 22 Dec, 2020
Reviewer #7 agreed
On 22 Dec, 2020
Reviewer #14 agreed
On 22 Dec, 2020
Reviewer #13 agreed
On 22 Dec, 2020
Reviewer #5 agreed
On 22 Dec, 2020
Reviewer #16 agreed
On 22 Dec, 2020
Reviewer #10 agreed
On 22 Dec, 2020
Reviewer #12 agreed
On 22 Dec, 2020
Reviewer #8 agreed
On 22 Dec, 2020
Reviewer #15 agreed
On 22 Dec, 2020
Reviewer #1 agreed
On 22 Dec, 2020
Reviewer #3 agreed
On 22 Dec, 2020
Reviewer #11 agreed
On 22 Dec, 2020
Reviewer #2 agreed
On 22 Dec, 2020
Reviewer #9 agreed
On 22 Dec, 2020
Reviewers invited
Invitations sent on 22 Dec, 2020
Editor assigned
On 21 Dec, 2020
Editor invited
On 21 Dec, 2020
Submission checks complete
On 21 Dec, 2020
First submitted
On 16 Dec, 2020
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
License:
This work is licensed under a CC BY 4.0 License. Read Full License
In this paper, the surface enhanced Raman scattering (SERS) characteristics of Au and [email protected]2O3 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 [email protected]2O3 dimer is controlled to remain unchanged. By comparing the distance of Au nucleus between Au and [email protected]2O3 dimer, it is found that the electric field enhancement factor of [email protected]2O3 dimer is much greater than that of Au dimer with the increase of Al2O3 thickness. The peak electric field of [email protected]2O3 dimer moves towards the middle of the resonance peak of the two materials, but the peak electric field of Au dimer is more concentrated than that of Au dimer, so that the excitation wavelength has less influence on Raman enhancement. 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.
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6