2019
DOI: 10.1002/adom.201901337
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Integrated “Hot Spots”: Tunable Sub‐10 nm Crescent Nanogap Arrays

Abstract: trapping, [5] single-molecule analysis, [6,7] surface plasmon (SP) enhanced spectroscopy. [6,8,9] To achieve the extremely concentrated and strong electric fields, lots of efforts are contributed to fabricate kinds of plasmonic structures, revealing that sub-10 nm nanogap and nanotip are the two key characteristics. [10,11] In theory, as predicted by Maxwell's equations, the electric fields would become stronger with the decreasing distance between metal nanostructures and can be confined in the gaps; [12][13]… Show more

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Cited by 21 publications
(14 citation statements)
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“…Fabrication of Chiral Nanogaps. The preparation process of the chiral nanogaps is shown in Figure 1a: (I) Epoxy nanopillar arrays substrates were first fabricated via colloidal lithography, 46,51,52 and (II) 40 nm Au was deposited with the azimuthal angle α 1 = 0°and polar angle θ = 35°onto the nanopillar substrate (deposition 1). The azimuthal angle was indicated by the black dashed line (in-plane projection of the material vapor beam in the substrate plane), and the polar angle is relative to the substrate normal.…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…Fabrication of Chiral Nanogaps. The preparation process of the chiral nanogaps is shown in Figure 1a: (I) Epoxy nanopillar arrays substrates were first fabricated via colloidal lithography, 46,51,52 and (II) 40 nm Au was deposited with the azimuthal angle α 1 = 0°and polar angle θ = 35°onto the nanopillar substrate (deposition 1). The azimuthal angle was indicated by the black dashed line (in-plane projection of the material vapor beam in the substrate plane), and the polar angle is relative to the substrate normal.…”
Section: Resultsmentioning
confidence: 99%
“…Here, we propose a low-cost and alternative method to fabricate a chiral metamaterial with sub-10 nm nanogaps (chiral nanogaps). Two Au nanocrescents separated by a sub-10 nm nanogap were fabricated based on subsequent depositions with different azimuthal angles and the following nanoskiving , technique. The fabrication method is in common use and able to form large-area chiral metamaterials in parallel at low cost.…”
mentioning
confidence: 99%
“…[39] One effective way to obtain a narrow gap is to flexibly tune the metal deposition process during the preparation of a metallic plasmonic array. [177][178][179][180] In Figure 6b, Li et al extended the sputtering time to enlarge the diameter of the plasmonic nanopillars pre-fabricated by using immersion lithography. [178] Thus, the gap distance between neighboring particles can be narrowed, greatly improved the enhancement effect of the array substrate.…”
Section: Surface-enhanced Spectroscopymentioning
confidence: 99%
“…As shown in Figure 10e, Zhang et al fabricated crescent nanogap arrays (CNGAs) that contained sub10 nm nanogaps and nanotips using colloidal lithography and nanoskiving tech niques. [83] The electric field is further enhanced effectively in the gaps and at the two crescents of the nanocrescents, which then greatly promotes the enhancement and reproduction of the SERS signal. The SERS signals of the CNGAs showed typical enhancement factors of 8 and 360 times when com pared with those of the tiponly crescent gold nanoparticles and the linear gold nanowires, respectively.…”
Section: Nanogaps For Sersmentioning
confidence: 99%
“…[13] The second pro cess (Figure 3b) yields 2D arrays of nanostructures. Patterning the film and combined with different sectioning directions Adaptation for semiconductor materials [32,34] Adaptation for polymeric materials [42] Embedding medium Thiol-containing polymeric embedding materials [48] Sectioning parameters Cutting direction [49,50] Cutting depth [34,52] Manipulation of slices Aligning-bonding approach [34] "Perfect transfer" approach [54] Applications development of nanoskiving Optical modulation Nanogaps for SERS [74,76,77,82,83] Photoluminescence [32,89] Electrochemical analysis Preparation of electrochemical nanoelectrodes [97][98][99][100] Electronic switches and sensors Light gating of molecular tunneling junctions [103] Mechanical strain sensors [107] Control of biomolecules and cells The detection of DNA-protein interactions [112] The control of cell organization [119] can prepare nanostructures with accurately defined length and spacing. [1] For example, perpendicular sectioning to the pat terned surface causes the production of rectangular wavy nano structure and parallel sectioning to the patterned surface causes the production of nanowire array.…”
Section: Introduction Of Ultramicrotome and Nanoskivingmentioning
confidence: 99%