Direct Formation of Arrays of Prolate Ag Nanoparticles by Dynamic Oblique Deposition

Suzuki, Motofumi; Maekita, Wataru; Kishimoto, Katsuhiro; Teramura, Satoshi; Nakajima, K.; Kimura, Kenji; Taga, Yasunori

doi:10.1143/jjap.44.l193

Cited by 27 publications

(26 citation statements)

References 27 publications

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“…The use of this writing procedure has been suggested for the optical encryption of information at a micron level [225]. Nano-columnar silver films directly prepared by OAD have been tested for SERS (see below) and for surface-enhanced Raman [524][525][526].…”

Section: Dichroism and Plasmonic Applicationsmentioning

confidence: 99%

Perspectives on oblique angle deposition of thin films: From fundamentals to devices

Barranco

Borrás

González‐Elipe

et al. 2016

Progress in Materials Science

616

436

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a b s t r a c tThe oblique angle configuration has emerged as an invaluable tool for the deposition of nanostructured thin films. This review develops an up to date description of its principles, including the atomistic mechanisms governing film growth and nanostructuration possibilities, as well as a comprehensive description of the applications benefiting from its incorporation in actual devices. In contrast with other reviews on the subject, the electron beam assisted evaporation technique is analyzed along with other methods operating at oblique angles, including, among others, magnetron sputtering and pulsed laser or ion beam-assisted deposition techniques. To account for the existing differences between deposition in vacuum or in the presence of a plasma, mechanistic simulations are critically revised, discussing well-established paradigms such as the tangent or cosine rules, and proposing new models that explain the growth of tilted porous nanostructures. In the second part, we present an extensive description of applications wherein oblique-angle-deposited thin films are of relevance. From there, we proceed by considering the requirements of a large number of functional devices in which these films are currently being utilized (e.g., solar cells, Li batteries, electrochromic glasses, biomaterials, sensors, etc.), and subsequently describe how and why these nanostructured materials meet with these needs.

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Section: Dichroism and Plasmonic Applicationsmentioning

confidence: 99%

Perspectives on oblique angle deposition of thin films: From fundamentals to devices

Barranco

Borrás

González‐Elipe

et al. 2016

Progress in Materials Science

616

436

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“…13 These Ag nanorods show excellent SERS properties. 14,15 In this study, we report that physically self-assembled Au nanorod arrays show fairly highly sensitive SERS properties that are comparable with those of Ag.…”

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confidence: 99%

Au Nanorod Arrays Tailored for Surface-Enhanced Raman Spectroscopy

et al. 2007

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IntroductionFor applying local field enhancement arising from local plasmons present in noble metal nanoparticles to biochemical sensors, such as surface-enhanced Raman scattering (SERS) sensors, it is important to control both the shape and the arrangement of the nanoparticles.1 It is well known that wellordered 2D periodic arrays of triangular nanoparticles prepared by nanosphere lithography (NSL) show plasma resonance within a rather narrow wavelength region, and the sharp corners of the triangles result in strong SERS.2 Although NSL enables the size of the nanoparticles to be tuned, the number density of the nanoparticles is geometrically fixed. Some applications, such as Raman imaging, may require more SERS-active spots to improve the space resolution. In addition, it is difficult to tune the lowest order of the local plasma resonance to the near-infrared (NIR) region, which is appropriate for biological applications. 3A drastic enhancement in the local field is considered to also occur at the ends of elongated nanoparticles. 4 In fact, for light in the visible to NIR region, SERS has been observed on arrays of elongated Ag nanoparticles, or so-called nanorods, whose widths are in the range of tens of nanometers and whose aspect ratios are 2 -5. 5-7 Liao et al. 5 prepared in-line aligned nanorod arrays on lithographically produced templates, while Martínes et al. 6 and Wachter et al. 7 produced side-by-side aligned nanorod arrays by oblique deposition. Taking into account the gap enhancement in the local field, 8 in-line alignment of the nanorods is more desirable than side-by-side alignment. However, even today, it is difficult to produce sub-micrometer patterns over large areas at low cost.Gold nanorods are also attracting much interest, since chemically stable Au is considered to be preferred to Ag for the material of the SERS substrates. In addition to lithographically produced Au nanorod arrays, 9 random aggregates of Au nanorods produced by chemical routes [10][11][12] are extensively investigated. However, it is not easy to immobilize the Au nanorods uniformly in isolation with each other.Recently, we demonstrated the direct formation of Ag nanorods with quasi-parallel major axes on a template layer of SiO2 having a strongly anisotropic surface morphology by using a dynamic oblique deposition (DOD) technique. 13 These Ag nanorods show excellent SERS properties. 14,15 In this study, we report that physically self-assembled Au nanorod arrays show fairly highly sensitive SERS properties that are comparable with those of Ag. ExperimentalThe preparation method of Au nanorod arrays is basically the same as that of Ag nanorod arrays reported in our previous papers.14,15 Briefly, template layers of SiO2 were prepared on a glass substrate by the serial bideposition (SBD) technique, which is a version of the vacuum evaporation technique. During SBD, the deposition angle, αSiO 2 , measured from the surface normal was fixed to 78.6˚, while the azimuth was rapidly changed by 180˚ with each deposition of a 10-nm-t...

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“…9 By using DOD, we have recently realized discontinuous Ag films with a large dichroism due to the plasma resonance for the purpose of applying them to thin film polarizers. 10 Although a detailed morphology of the Ag particles was not elucidated, their optical properties suggested that the alignment of the elongated Ag nanorods was quasiparallel. In this study, we investigated the morphology of these physically self-assembled Ag nanorod arrays in detail and measured their SERS properties.…”

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confidence: 99%

In-line aligned and bottom-up Ag nanorods for surface-enhanced Raman spectroscopy

Suzuki

Maekita

Wada

et al. 2006

Applied Physics Letters

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Direct Formation of Arrays of Prolate Ag Nanoparticles by Dynamic Oblique Deposition

Abstract: We study metastable dynamical breaking of supersymmetry in A n quiver gauge theories. We present a general analysis and criteria for the perturbative existence of metastable vacua in quivers of any length. Different mechanisms of gauge mediation can be realized.

Cited by 27 publications

References 27 publications

Perspectives on oblique angle deposition of thin films: From fundamentals to devices

Perspectives on oblique angle deposition of thin films: From fundamentals to devices

Au Nanorod Arrays Tailored for Surface-Enhanced Raman Spectroscopy

In-line aligned and bottom-up Ag nanorods for surface-enhanced Raman spectroscopy

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