Surface-Enhanced Raman Scattering in Hierarchical Structures of Au Formed Using Templates by Site-Controlled Tunnel Etching of Al

Kondo, Toshiaki; Fukushima, Tatsuro; Nishio, Kazuyuki; Masuda, Hideki

doi:10.1143/apex.2.125001

Cited by 8 publications

(7 citation statements)

References 16 publications

(16 reference statements)

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“…The length of Au nanowires was controlled by changing the deposition time ( Figure A4 d). To reinforce the sample, Ni electrodeposition was carried out at a constant voltage of −1 V [ 46 ]. Au nanowire array was obtained by dissolving the anodic porous alumina template and Al in 10 wt% NaOH solution.…”

Section: Figure A1mentioning

confidence: 99%

Structure and Optical Anisotropy of Spider Scales and Silk: The Use of Chromaticity and Azimuth Colors to Optically Characterize Complex Biological Structures

et al. 2023

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Herein, we give an overview of several less explored structural and optical characterization techniques useful for biomaterials. New insights into the structure of natural fibers such as spider silk can be gained with minimal sample preparation. Electromagnetic radiation (EMR) over a broad range of wavelengths (from X-ray to THz) provides information of the structure of the material at correspondingly different length scales (nm-to-mm). When the sample features, such as the alignment of certain fibers, cannot be characterized optically, polarization analysis of the optical images can provide further information on feature alignment. The 3D complexity of biological samples necessitates that there be feature measurements and characterization over a large range of length scales. We discuss the issue of characterizing complex shapes by analysis of the link between the color and structure of spider scales and silk. For example, it is shown that the green-blue color of a spider scale is dominated by the chitin slab’s Fabry–Pérot-type reflectivity rather than the surface nanostructure. The use of a chromaticity plot simplifies complex spectra and enables quantification of the apparent colors. All the experimental data presented herein are used to support the discussion on the structure–color link in the characterization of materials.

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Section: Figure A1mentioning

confidence: 99%

Structure and Optical Anisotropy of Spider Scales and Silk: The Use of Chromaticity and Azimuth Colors to Optically Characterize Complex Biological Structures

et al. 2023

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“…SERS may be induced by the combined NV and SPR dipole polarization and lightning rod effect of NRs. In addition, a chemical effect may also occur at the surrounding surfaces of NVs, 8,9,[12][13][14][15][16][17][18] further enlarging the effect of SERS on NV_Au/Ag_NR. The formation of DS_Au/Ag_NR and NVAu/Ag_NR was confirmed via FE-SEM and HR-FETEM.…”

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Nanovoids embedded in FIB-fabricated Au/Ag nanorod arrays for ultrasensitive SERS-active substrate

Sivashanmugan

Liao

Yao

2014

Appl. Phys. Express

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A focused ion beam (FIB) was employed to fabricate Au/Ag nanorod (NR) arrays (fibAu/Ag_NR). After an annealing process, the fibAu/Ag_NR exhibited a Au/Ag diffused structure or nanovoids (NVs) embedded in NRs preferentially at the Au/Ag interface. With crystal violet (CV) used as the probe molecule, NV_Au/Ag_NRs were found to show an increase in the effect of surface-enhanced Raman scattering. An enhancement of 7 orders of magnitude was obtained at low concentrations of CV. It is most likely that the embedded NVs increase the effective surface area for the interactions between CV molecules and laser light. A strong electromagnetic field effect is presumably generated inside NVs and around NRs.

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“…Both the scattered light and the incident light contribute to the total field enhancement at the interface. 19,20) Moreover, the total field enhancement depends on the geometry and distribution of AuGa 2 on Au NR. Therefore, the intra-AuGa 2 and AuGa 2 on Au NR may strongly enhance the Raman scattering of the CV molecule located in the gaps of AuGa 2 on Au NRs.…”

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confidence: 99%

AuGa₂on focused Ga ion beam-fabricated Au nanorod array for trace detection of melamine cyanurate in milk solution

Sivashanmugan

Liao

Liu

et al. 2014

Appl. Phys. Express

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Au nanorod arrays were fabricated using a focused gallium (Ga) ion beam (fibAu_NRs) with various levels of Ga ion energy. The formation of AuGa2 on fibAu_NRs was controlled by adjusting the level of Ga ion energy and subsequent heat treatment in order to increase the effect of surface-enhanced Raman scattering (SERS). The SERS enhancement factor of the substrates was evaluated using crystal violet as a molecular test probe. The results show that low-density AuGa2 formation on fibAu_NRs increases the SERS effect, which is likely due to the interjunction charge transfer between Au and AuGa2. An optimized AuGa2 on fibAu_NRs was applied to the trace detection of melamine cyanurate in milk solution with high measured sensitivity.

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Surface-Enhanced Raman Scattering in Hierarchical Structures of Au Formed Using Templates by Site-Controlled Tunnel Etching of Al

Cited by 8 publications

References 16 publications

Structure and Optical Anisotropy of Spider Scales and Silk: The Use of Chromaticity and Azimuth Colors to Optically Characterize Complex Biological Structures

Structure and Optical Anisotropy of Spider Scales and Silk: The Use of Chromaticity and Azimuth Colors to Optically Characterize Complex Biological Structures

Nanovoids embedded in FIB-fabricated Au/Ag nanorod arrays for ultrasensitive SERS-active substrate

AuGa₂on focused Ga ion beam-fabricated Au nanorod array for trace detection of melamine cyanurate in milk solution

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Surface-Enhanced Raman Scattering in Hierarchical Structures of Au Formed Using Templates by Site-Controlled Tunnel Etching of Al

Cited by 8 publications

References 16 publications

Structure and Optical Anisotropy of Spider Scales and Silk: The Use of Chromaticity and Azimuth Colors to Optically Characterize Complex Biological Structures

Structure and Optical Anisotropy of Spider Scales and Silk: The Use of Chromaticity and Azimuth Colors to Optically Characterize Complex Biological Structures

Nanovoids embedded in FIB-fabricated Au/Ag nanorod arrays for ultrasensitive SERS-active substrate

AuGa2on focused Ga ion beam-fabricated Au nanorod array for trace detection of melamine cyanurate in milk solution

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AuGa₂on focused Ga ion beam-fabricated Au nanorod array for trace detection of melamine cyanurate in milk solution