Sustainable Surface-Enhanced Raman Substrate with Hexagonal Boron Nitride Dielectric Spacer for Preventing Electric Field Cancellation at Au–Au Nanogap

2021 ◽  
Vol 13 (35) ◽  
pp. 42176-42182
Author(s):  
Jong-Guk Ahn ◽  
Gyeonghun Yeo ◽  
Yeji Han ◽  
Younghee Park ◽  
Jong Wook Hong ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Electric Field ◽  
Hexagonal Boron Nitride ◽  
Dielectric Spacer ◽  
Surface Enhanced ◽  
Surface Enhanced Raman

scholarly journals Boron Nitride Nanosheets Improve Sensitivity and Reusability of Surface-Enhanced Raman Spectroscopy

2016 ◽  
Vol 55 (29) ◽  
pp. 8405-8409 ◽  
Author(s):  
Qiran Cai ◽  
Srikanth Mateti ◽  
Wenrong Yang ◽  
Rob Jones ◽  
Kenji Watanabe ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Boron Nitride ◽  
Surface Enhanced Raman Spectroscopy ◽  
Boron Nitride Nanosheets ◽  
Surface Enhanced ◽  
Surface Enhanced Raman

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

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Bao-xin Yan ◽  
Yan-ying Zhu ◽  
Yong Wei ◽  
Huan Pei
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Electric Field ◽  
Raman Scattering ◽  
Enhancement Factor ◽  
Field Enhancement ◽  
Electric Field Enhancement ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

AbstractIn 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.

scholarly journals Терагерцовые дисперсия и усиление при стриминге электронов в графене при 300 K

2020 ◽  
Vol 54 (9) ◽  
pp. 888
Author(s):  
А.А. Андронов ◽  
В.И. Позднякова
Keyword(s):  
Boron Nitride ◽  
Electric Field ◽  
Terahertz Radiation ◽  
High Resistance ◽  
Applied Voltage ◽  
Momentum Space ◽  
Hexagonal Boron Nitride ◽  
Strong Electric Field ◽  
Microwave Generator ◽  
Time Frequency

Abstract We interpret the recent observations of Otsuji’s team (Sendai) on switching from absorption to amplification at a temperature of T = 300 K during the passage of terahertz radiation through hexagonal boron nitride–graphene sandwiches with multiple gates on the surface with an increase in the electric field in graphene. It is shown that these effects are related to dispersion and negative conductivity near the transit-time frequency of electrons in momentum space under streaming (anisotropic distribution) in graphene in a strong electric field. On the basis of these data, a universal tunable terahertz source is proposed, which has the form of a graphene-containing sandwich with a high-resistance silicon wafer (a cavity) with an applied voltage. This terahertz cavity is a complete analog of the microwave generator implemented on an InP chip by Vorobev’s team (St. Petersburg).

scholarly journals Boron nitride nanosheets as improved and reusable substrates for gold nanoparticles enabled surface enhanced Raman spectroscopy

2015 ◽  
Vol 17 (12) ◽  
pp. 7761-7766 ◽  
Author(s):  
Qiran Cai ◽  
Lu Hua Li ◽  
Yuanlie Yu ◽  
Yun Liu ◽  
Shaoming Huang ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Raman Spectroscopy ◽  
Boron Nitride ◽  
Surface Enhanced Raman Spectroscopy ◽  
Boron Nitride Nanosheets ◽  
Highly Sensitive ◽  
Surface Enhanced ◽  
Surface Enhanced Raman

Boron nitride nanosheets covered by gold nanoparticles are controllably fabricated for highly-sensitive and reusable substrates for surface enhanced Raman spectroscopy.

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