scholarly journals Plasmonic Resonant Nanoantennas Induce Changes in the Shape and the Intensity of Infrared Spectra of Phospholipids

Molecules ◽  
2021 ◽  
Vol 27 (1) ◽  
pp. 62
Author(s):  
Fatima Omeis ◽  
Zahia Boubegtiten-Fezoua ◽  
Ana Filipa Santos Seica ◽  
Romain Bernard ◽  
Muhammad Haseeb Iqbal ◽  
...  
Keyword(s):  
Spectral Properties ◽  
Field Enhancement ◽  
Spectroscopic Studies ◽  
Biological Molecules ◽  
Future Application ◽  
Spectral Signature ◽  
Electric Field Enhancement ◽  
Low Concentrations ◽  
Surface Enhanced ◽  
Different Temperatures

Surface enhanced infrared absorption spectroscopic studies (SEIRAS) as a technique to study biological molecules in extremely low concentrations is greatly evolving. In order to use the technique for identification of the structure and interactions of such biological molecules, it is necessary to identify the effects of the plasmonic electric-field enhancement on the spectral signature. In this study the spectral properties of 1,2-Dipalmitoyl-sn-glycero-3 phosphothioethanol (DPPTE) phospholipid immobilized on gold nanoantennas, specifically designed to enhance the vibrational fingerprints of lipid molecules were studied. An AFM study demonstrates an organization of the DPPTE phospholipid in bilayers on the nanoantenna structure. The spectral data were compared to SEIRAS active gold surfaces based on nanoparticles, plain gold and plain substrate (Si) for different temperatures. The shape of the infrared signals, the peak positions and their relative intensities were found to be sensitive to the type of surface and the presence of an enhancement. The strongest shifts in position and intensity were seen for the nanoantennas, and a smaller effect was seen for the DPPTE immobilized on gold nanoparticles. This information is crucial for interpretation of data obtained for biological molecules measured on such structures, for future application in nanodevices for biologically or medically relevant samples.

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 Study on Surface Enhanced Raman Scattering of Au and Au@Al2O3 Spherical Dimers Based on 3D Finite Element Method

2020 ◽  
Author(s):  
Baoxin Yan ◽  
Yanying Zhu ◽  
Yong Wei ◽  
Huan Pei
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Electric Field ◽  
Enhancement Factor ◽  
Field Enhancement ◽  
Electric Field Enhancement ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Peak Electric Field

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 electric field of Au@Al2O3 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.

Gold nanonails for surface-enhanced infrared absorption

2020 ◽  
Vol 5 (8) ◽  
pp. 1200-1212
Author(s):  
Hang Yin ◽  
Nannan Li ◽  
Yubing Si ◽  
Han Zhang ◽  
Baocheng Yang ◽  
...  
Keyword(s):  
Electric Field ◽  
Infrared Absorption ◽  
Colloidal Gold ◽  
Field Enhancement ◽  
Infrared Region ◽  
Electric Field Enhancement ◽  
Mid Infrared ◽  
Large Electric Field ◽  
Surface Enhanced

Colloidal gold nanonails, exhibiting large electric field enhancement in the mid-infrared region, are synthesized for surface-enhanced infrared absorption (SEIRA).

Study of surface-enhanced Raman scattering of InAs particles of subwavelength apertures at terahertz frequencies

2015 ◽  
Vol 29 (31) ◽  
pp. 1550197 ◽  
Author(s):  
Ying Liu ◽  
Guangjun Ren ◽  
Rongjian Du ◽  
Yongming Zhang ◽  
Tianbo Tan ◽  
...  
Keyword(s):  
Electric Field ◽  
Enhancement Factor ◽  
Field Enhancement ◽  
Electric Field Enhancement ◽  
Subwavelength Apertures ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Theoretical Mechanism ◽  
Terahertz Frequencies

We present a theoretical mechanism for electric field enhancement with SERS of InAs particles of subwavelength apertures under THz excitation. The distribution of electric field confirms that there is a strong enhancement in the InAs particles at THz frequencies. The InAs with a Drude-like behavior in THz range, which is similar to metals at optical frequencies, leads to different SERS when the parameters of these two particles change. The SERS enhancement factor can reach [Formula: see text] under the certain conditions.

Room-temperature mechanochemical synthesis of silver nanoparticle homojunction assemblies for the surface-enhanced Raman scattering substrate

RSC Advances ◽  
2016 ◽  
Vol 6 (78) ◽  
pp. 74662-74669 ◽  
Author(s):  
Bo Lu ◽  
Fangyi Zhan ◽  
Guodong Gong ◽  
Yali Cao ◽  
Qiang Zhen ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Silver Nanoparticle ◽  
Mechanochemical Synthesis ◽  
Room Temperature ◽  
Field Enhancement ◽  
Electric Field Enhancement ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Surface Electric Field

Room-temperature mechanochemical synthesis of Ag/Ag homojunction assemblies giving giant surface electric field enhancement for SERS.

Large-volume hot spots in gold spiky nanoparticle dimers for high-performance surface-enhanced spectroscopy

Nanoscale ◽  
2014 ◽  
Vol 6 (21) ◽  
pp. 12921-12928 ◽  
Author(s):  
Anran Li ◽  
Shuzhou Li
Keyword(s):  
Electric Field ◽  
Large Volume ◽  
Hot Spots ◽  
High Performance ◽  
Field Enhancement ◽  
Electric Field Enhancement ◽  
Large Electric Field ◽  
Surface Enhanced ◽  
Performance Surface

Hot spots with both large electric field enhancement and large volumes can be obtained in spiky nanoparticle dimers.

Examination of the method for detecting antifungal agents for citrus fruits by SERS method

Impact ◽  
2021 ◽  
Vol 2021 (1) ◽  
pp. 42-43
Author(s):  
Hiroyuki Takei
Keyword(s):  
Surface Enhanced Raman Spectroscopy ◽  
Biological Molecules ◽  
Citrus Fruits ◽  
High Definition ◽  
Scientific Disciplines ◽  
Low Concentrations ◽  
Surface Enhanced ◽  
Biological Compounds ◽  
Surface Enhanced Raman ◽  
Key Techniques

All scientific disciplines require an amalgam of expertise from different fields to function. This is particularly necessary in biology where key techniques can be based on advanced chemistry, physics and engineering principles. This multidisciplinary aspect is often founded on the need to achieve precise measurements of biological compounds, image extremely small organisms and structures in high definition or separate different biological molecules from one another. All of these require accurate, precise and reliable techniques to carry out the task. One such technique is surface-enhanced Raman spectroscopy (SERS). SERS is complex but relies on Raman scattering – the phenomenon of photons being scattered by molecules – occurring with molecules that are adsorbed to a solid surface. The detection of this scattering allows for the identification of specific molecules, even in very low concentrations. This is invaluable in biology where active biomolecules (e.g. proteins) can be present in extremely low concentrations. Dr Hiroyuki Takei of the Graduate School of Life Sciences, Toyo University, Japan, is working on a project that is focused creating a SERS technique that can consistently and accurately detect fungicide levels on citrus fruits.

Sign in / Sign up

Export Citation Format

Share Document