Optical constants and structural properties of thin gold films

Yakubovsky, Dmitry I.; Arsenin, Aleksey V.; Stebunov, Yury V.; Fedyanin, Dmitry Yu.; Volkov, Valentyn S.

doi:10.1364/oe.25.025574

Cited by 292 publications

(180 citation statements)

References 40 publications

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“…For instance, using instead the values from Johnson and Christy 54 redshifts the resonance position by around 40 meV (see Figure S6), and changes in especially the imaginary part of ε have been reported for thin gold films. 55 However, we still see that we are able to reproduce the experimentally observed behaviour both in scattering and absorption with good agreement, which further corroborates the observation of the onset of the strong-coupling regime in our system. The calculations show cross sections approaching zero at the exciton energy, indicative of strong plasmon-exciton coupling.…”

Section: Resultssupporting

confidence: 89%

Single-Crystalline Gold Nanodisks on WS₂ Mono- and Multilayers for Strong Coupling at Room Temperature

Geisler¹,

et al. 2019

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Section: Resultssupporting

confidence: 89%

Single-Crystalline Gold Nanodisks on WS₂ Mono- and Multilayers for Strong Coupling at Room Temperature

Geisler¹,

et al. 2019

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“…For the bulk data, we used the dielectric function of gold recently measured by Yakubovsky et al on a 25 nm thick film (measured wavelength range 300-2000 nm). 35 A smoothing spline was fitted to these data yielding the dielectric function of gold at room temperature every 1 nm ( Fig. 1).…”

Section: Computational Framework Dielectric Function Of Nanosized Golmentioning

confidence: 99%

Kinetics and Mechanism of Metal Nanoparticle Growth via Optical Extinction Spectroscopy and Computational Modeling: The Curious Case of Colloidal Gold

et al. 2019

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An overarching computational framework unifying several optical theories to describe the temporal evolution of gold nanoparticles (GNPs) during a seeded growth process is presented. To achieve this, we used the inexpensive and widely available optical extinction spectroscopy, to obtain quantitative kinetic data. In situ spectra collected over a wide set of experimental conditions were regressed using the physical model, calculating light extinction by ensembles of GNPs during the growth process. This model provides temporal information on the size, shape, and concentration of the particles, and any electromagnetic interactions between them. Consequently, we were able to describe the mechanism of GNP growth and divide the process into distinct genesis periods. We provide explanations for several longstanding mysteries, e.g., the phenomena responsible for the purple-greyish hue during the early stages of GNP growth, the complex interactions between nucleation, growth and aggregation events, and a clear distinction between agglomeration and electromagnetic interactions. The presented theoretical formalism has been developed in a generic fashion so that it can readily be adapted to other nanoparticulate formation scenarios such as the genesis of various metal nanoparticles. KeywordsGold nanoparticles, seeded growth, UV-Vis spectroscopy, computational modeling, kinetics and mechanism.reason, there is a great need for a general and easily adaptable theoretical framework that utilizes the practical application of OES in the study of nanomaterial formation.So far, several investigations have addressed the mechanistic aspects during the (seeded) growth of GNPs using various characterization techniques such as atomic force microscopy (AFM), 5,14,18 electrophoretic measurements, 19,20 redox potential/pH measurements, 18-20 dynamic light scattering (DLS), 14,19,21 ex situ TEM, 4,5,7,14,[19][20][21][22][23] in situ TEM, 4,5 , and X-ray scattering. 6,7,13,23,24 Many of these studies follow the process also using ex situ 5,[19][20][21][22] or in situ 14,23,24 UV-vis spectroscopy but the information is treated merely qualitatively.From the plethora of research, some of which was summarized above, we know that the processes of seeded growth is typically accompanied by nucleation of new particles. 5,25 This could either be in a homogeneous fashion, 25 or in the close vicinity of the already present seed surface 5 (so called true catalytic secondary nucleation 26 or, equivalently, near surface nucleation followed by particle mediated growth 5 ). Additional complications arise from the possibility of agglomeration/aggregation invoked in many studies to describe the transient enhanced extinction in the wavelength range 600-800 nm, namely, the temporary purple-greyish colour of the suspension. 7,[18][19][20]27 Biggs et al. 18 and Chow and Zukoski 19 explained this in the light of the reduced colloidal stability in the presence of Au(III) in solution. Later, Rodriguez-Gonzalez and co-workers noticed that a homogeneous Au(III)→Au(I...

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“…In Figure , we show effective dielectric functions of ultrathin Au films. They were obtained using an approach described in our previous papers . Additionally, in order to accurately determine ε′ and ε″ of gold films by ellipsometry, we obtained dielectric functions of monolayer MoS 2 films (Figure f) and included them into the ellipsometric model.…”

mentioning

confidence: 99%

Ultrathin and Ultrasmooth Gold Films on Monolayer MoS₂

Yakubovsky

Stebunov

Kirtaev

et al. 2019

Adv Materials Inter

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films are also the key element of plasmonic waveguides [10,11] and hyperbolic metamaterials. [12,13] Growth of continuous and ultrathin gold films on different substrates, such as glass, silicon oxide, silicon nitride, graphene etc. is notoriously difficult due to the poor wetting of gold to these substrates. [14,15] The growth kinetics of metal films is generally determined by the adsorption and diffusion behavior of metal adatoms on the substrate. A small ratio of the adsorption energy of metal adatoms on the substrate to the bulk cohesive energy of the metal and low diffusion barrier for an adatom favor the 3D island growth behavior also known as the Volmer-Weber growth mode. [16] Within the framework of this growth model, the formation of a metal film is associated with the following stages: nucleation of islands, island growth, island impingement and coalescence, percolation, and channel filling to finally form a continuous thin film. To reduce the percolation threshold of ultrathin gold films, adhesion or seed layers of Ti, Cr, Ni, Pt, or Ge are commonly used. However, these adhesion layers significantly affect the optical and electrical properties of ultrathin metal nanostructures. [17][18][19][20][21][22] Recently, the organosilane-based adhesion layers (mercaptosilanes and aminosilanes) were used for the deposition of sub-10 nm thick continuous Au films on silicon and glass surfaces. [23][24][25][26][27] However, organosilanes are not compatible with nonoxidized silicon surfaces and poorly compatible with standard lift-off procedures, that imposes severe limitations to their use as adhesion layers. [21] Adhesion layers based on organosilanes are also inefficient for the deposition of atomically thin metal films [14] and does not move us closer to the deposition of 2D layers from bulk plasmonic metals. Actually, the latter seems now as impossible as the deposition of atomically thin carbon films had been considered before 2004. [28] In the present paper, we propose the use of MoS 2 monolayer as an entirely new type of "universal" (i.e., it can be transferred to any arbitrary substrate) [29][30][31] adhesion layer for ultrathin (<10 nm) high-quality continuous gold films. To test the feasibility of this idea, we deposited ultrathin gold films of different thicknesses onto monolayer MoS 2 , grown on silicon dioxide substrates (Figure 1a), and studied their structural and optical properties.An electron beam evaporator Nano Master NEE-4000 was used to deposit Au films on top of atmospheric pressure CVD (APCVD)-grown full area coverage MoS 2 monolayers on silicon wafers with a 285 nm thick SiO 2 coating (from 2D semiconductors Inc.). The deposition was performed at Sub-10 nm continuous metal films are promising candidates for flexible and transparent nanophotonics and optoelectronic applications. In this article, it is demonstrated that monolayer MoS 2 is a perspective adhesion layer for the deposition of continuous conductive gold films with a thickness of only 3-4 nm. Optical properties of continuous ultrath...

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Optical constants and structural properties of thin gold films

Cited by 292 publications

References 40 publications

Single-Crystalline Gold Nanodisks on WS₂ Mono- and Multilayers for Strong Coupling at Room Temperature

Single-Crystalline Gold Nanodisks on WS₂ Mono- and Multilayers for Strong Coupling at Room Temperature

Kinetics and Mechanism of Metal Nanoparticle Growth via Optical Extinction Spectroscopy and Computational Modeling: The Curious Case of Colloidal Gold

Ultrathin and Ultrasmooth Gold Films on Monolayer MoS₂

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Optical constants and structural properties of thin gold films

Cited by 292 publications

References 40 publications

Single-Crystalline Gold Nanodisks on WS2 Mono- and Multilayers for Strong Coupling at Room Temperature

Single-Crystalline Gold Nanodisks on WS2 Mono- and Multilayers for Strong Coupling at Room Temperature

Kinetics and Mechanism of Metal Nanoparticle Growth via Optical Extinction Spectroscopy and Computational Modeling: The Curious Case of Colloidal Gold

Ultrathin and Ultrasmooth Gold Films on Monolayer MoS2

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Single-Crystalline Gold Nanodisks on WS₂ Mono- and Multilayers for Strong Coupling at Room Temperature

Single-Crystalline Gold Nanodisks on WS₂ Mono- and Multilayers for Strong Coupling at Room Temperature

Ultrathin and Ultrasmooth Gold Films on Monolayer MoS₂