Self-Shadowing Deposited Pure Metal Nanohelix Arrays and SERS Application

Jen, Yi‐Jun; Chan, San; Huang, Jyong-Wei; Jheng, Ci-Yao; Liu, Wei-Chih

doi:10.1186/s11671-015-1205-8

Cited by 26 publications

(23 citation statements)

References 17 publications

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“…However, expensive lithography is required to pattern the seeded surface of the substrate [7]. Recent work has revealed that pure metal helix arrays can be obliquely deposited on smooth substrates via self-shadowing [8][9][10][11]. Rather than using liquid nitrogen to cool the substrate to a temperature of around −140 • C, metal helix arrays can be grown on a substrate at a temperature of 10 • C using ice water for substrate cooling, as has been proposed in recent works [12].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Glancing Angle Deposition Conditions on the Morphology of a Silver Nanohelix Array

et al. 2017

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Silver nanohelices were grown on smooth substrates using glancing angle deposition and substrate cooling. Various nanohelix arrays were deposited under different deposition conditions-different deposition rates, substrate spin rates, deposition angles, and substrate temperatures. The effect of deposition conditions on the morphology of each nanohelix array in terms of pitch angle, pitch length, wire diameter, and radius of curvature was investigated. The dependence of circular dichroism on the size of the nanohelix arrays was also measured and demonstrated.

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Section: Introductionmentioning

confidence: 99%

The Effect of Glancing Angle Deposition Conditions on the Morphology of a Silver Nanohelix Array

et al. 2017

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“…There have yet to be temperature-SERS studies done with other substrates, such as polymers, that have significantly different thermal conductivities to typical silicon/glass substrates. While changes in geometries were observed as a temperature dependence during oblique angle depositions, there is little in literature that studies this temperature dependence with other nanostructures [15,53], perhaps this will be a new area that will be expanded in the near future.…”

Section: Temperature Dependent Oblique Angle Depositionmentioning

confidence: 99%

“…Substrate rotation during OAD can generate helical structures, Jen et al have investigated nanohelix arrays using oblique angle depositions at −140 • C that were applied to SERS investigations. In their 2015 work, they compared nanohelix arrays made from Ag and Au, where it was found that gold was the better SERS material for this configuration [53]. This study compared the SERS spectra of BPE using nanohelix and nanorod arrays made with Ag, Figure 10 is from [53], indicating clearer SERS spectrum with a nanohelix array.…”

Section: Geometries Of Oad Derived Sers Substratesmentioning

confidence: 99%

“…In their 2015 work, they compared nanohelix arrays made from Ag and Au, where it was found that gold was the better SERS material for this configuration [53]. This study compared the SERS spectra of BPE using nanohelix and nanorod arrays made with Ag, Figure 10 is from [53], indicating clearer SERS spectrum with a nanohelix array. From that study, they found that by using a cooled substrate rotation, the film morphology could be controlled as a function of rotation speed.…”

Section: Geometries Of Oad Derived Sers Substratesmentioning

confidence: 99%

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Surface Enhanced Raman Scattering Substrates Made by Oblique Angle Deposition: Methods and Applications

Chu

Song

et al. 2017

Coatings

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Surface Enhanced Raman Spectroscopy presents a rapid, non-destructive method to identify chemical and biological samples with up to single molecule sensitivity. Since its discovery in 1974, the technique has become an intense field of interdisciplinary research, typically generating >2000 publications per year since 2011. The technique relies on the localised surface plasmon resonance phenomenon, where incident light can couple with plasmons at the interface that result in the generation of an intense electric field. This field can propagate from the surface from the metal-dielectric interface, so molecules within proximity will experience more intense Raman scattering. Localised surface plasmon resonance wavelength is determined by a number of factors, such as size, geometry and material. Due to the requirements of the surface optical response, Ag and Au are typical metals used for surface enhanced Raman applications. These metals then need to have nano features that improve the localised surface plasmon resonance, several variants of these substrates exist; surfaces can range from nanoparticles in a suspension, electrochemically roughened electrodes to metal nanostructures on a substrate. The latter will be the focus of this review, particularly reviewing substrates made by oblique angle deposition. Oblique angle deposition is the technique of growing thin films so that the material flux is not normal to the surface. Films grown in this fashion will possess nanostructures, due to the atomic self-shadowing effect, that are dependent mainly on the deposition angle. Recent developments, applications and highlights of surface enhanced Raman scattering substrates made by oblique angle deposition will be reviewed.Keywords: surface enhanced Raman spectroscopy; coatings on polymer; special substrate materials; metal coatings; deposition, characterisations and applications of sculptured and textured thin films

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“…A metal nanohelix array can reportedly be obliquely deposited on a seeded substrate by spinning the cooled substrate during deposition32. Our recent work has shown that silver and gold nanohelix arrays can be obliquely deposited on a smooth substrate at with an optimal spin rate with respect to the deposition rate3334. Without patterned substrates, nanohelices are grown by self-shadowing; the nanohelices are distributed densely, and rod-to-rod gaps with widths of less than 10 nm are randomly and densely distributed within the array.…”

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confidence: 99%

Densely packed aluminum-silver nanohelices as an ultra-thin perfect light absorber

Jen

Huang

Liu

et al. 2017

Sci Rep

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Metals have been formed into nanostructures to absorb light with high efficiency through surface plasmon resonances. An ultra-thin plasmonic structure that exhibits strong absorption over wide ranges of wavelengths and angles of incidence is sought. In this work, a nearly perfect plasmonic nanostructure is fabricated using glancing angle deposition. The difference between the morphologies of obliquely deposited aluminum and silver nanohelices is exploited to form a novel three-dimensional structure, which is an aluminum-silver nanohelix array on a pattern-free substrate. With a thickness of only 470 nm, densely distributed nanohelices support rod-to-rod localized surface plasmons for broadband and polarization-independent light extinction. The extinctance remains high over wavelengths from 400 nm to 2000 nm and angles of incidence from 0° to 70°.

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Self-Shadowing Deposited Pure Metal Nanohelix Arrays and SERS Application

Cited by 26 publications

References 17 publications

The Effect of Glancing Angle Deposition Conditions on the Morphology of a Silver Nanohelix Array

The Effect of Glancing Angle Deposition Conditions on the Morphology of a Silver Nanohelix Array

Surface Enhanced Raman Scattering Substrates Made by Oblique Angle Deposition: Methods and Applications

Densely packed aluminum-silver nanohelices as an ultra-thin perfect light absorber

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