Plasmon Coupling in Two-Dimensional Arrays of Silver Nanoparticles: II. Effect of the Particle Size and Interparticle Distance

Kinnan, Mark K.; Chumanov, George

doi:10.1021/jp911411x

Cited by 107 publications

(84 citation statements)

References 32 publications

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“…For example, as the unit cell size increases from 1.2 to 2.5 nm, the feature at 370 nm diminishes and eventually vanishes leaving a single peak which shifts from 480 to 520 nm as seen in Figure 3b. The redshift in the plasmon resonance frequency with increasing particle separation is also in agreement with experiments [58] and theoretical calculations based on the discrete dipole approximation on dimers [59]. Our results also confirm that the plasmon resonance becomes narrower with increasing cluster size as will be shown later [60].…”

Section: Comparison Between Local Basis Function and Plane Wave Methodssupporting

confidence: 90%

Ab initio calculations of optical properties of silver clusters: cross-over from molecular to nanoscale behavior

Titantah

Karttunen

2016

Eur. Phys. J. B

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Abstract. Electronic and optical properties of silver clusters were calculated using two different ab initio approaches: (1) based on all-electron full-potential linearized-augmented plane-wave method and (2) local basis function pseudopotential approach. Agreement is found between the two methods for small and intermediate sized clusters for which the former method is limited due to its all-electron formulation. The latter, due to non-periodic boundary conditions, is the more natural approach to simulate small clusters. The effect of cluster size is then explored using the local basis function approach. We find that as the cluster size increases, the electronic structure undergoes a transition from molecular behavior to nanoparticle behavior at a cluster size of 140 atoms (diameter ∼1.7 nm). Above this cluster size the steplike electronic structure, evident as several features in the imaginary part of the polarizability of all clusters smaller than Ag147, gives way to a dominant plasmon peak localized at wavelengths 350 nm ≤ λ ≤ 600 nm. It is, thus, at this length-scale that the conduction electrons' collective oscillations that are responsible for plasmonic resonances begin to dominate the opto-electronic properties of silver nanoclusters.

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Section: Comparison Between Local Basis Function and Plane Wave Methodssupporting

confidence: 90%

Ab initio calculations of optical properties of silver clusters: cross-over from molecular to nanoscale behavior

Titantah

Karttunen

2016

Eur. Phys. J. B

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“…intrinsic ionic strength equivalent to 1 mM NaCl), the number of NPs that could be adsorbed to the LLI under an RCF of 9391g in 10 minutes was 4.0 ± 0.1Í10 10 NPs from a bulk aqueous solution containing 2.75Í10 11 NPs in total. The low ionic strength of the solution means that the electrostatic repulsion acts over a longer distance inhibiting oncoming particles from adsorbing to the interface.…”

Section: Salt Concentration Dependence On Np Adsorption and Plasmon Rmentioning

confidence: 99%

“…10 One of the main benefits of localising NPs at a LLI for these applications is the aforementioned self-assembly. 11 Currently, most technological applications of nanoassemblies are based around solid-state fabrication.…”

Section: Introductionmentioning

confidence: 99%

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Plasmonic Ruler at the Liquid–Liquid Interface

et al. 2012

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We report on a simple, fast, and inexpensive method to study adsorption and desorption of metallic nanoparticles at a liquid/liquid interface. These interfaces provide an ideal platform for the formation of two-dimensional monolayers of nanoparticles, as they form spontaneously, cannot be broken, and are defectcorrecting, acting as 2D 'nanoparticle traps'. Such two-dimensional self-assembled nanoparticle arrays have a vast range of potential applications in displays, catalysis, plasmonic rulers, optoelectronics, sensors and detectors. Here, we show that 16 nm diameter gold nanoparticles can be controllably adsorbed to a water/1,2-dichloroethane interface, and we can direct the average inter-particle spacing at the interface over the range 6-35 nm. The particle density and average inter-particle spacing are experimentally assessed by measuring the optical plasmonic response of the nanoparticles in the bulk and at the interface, and by comparing the experimental data with existing theoretical results.Keywords: liquid-liquid interface, Plasmonic Ruler, Nanoparticles, Self Assembly, Centrifugation. Nanoparticle (NP) adsorption at liquid-liquid interfaces (LLI) is a well established phenomenon that was first reported independently more than a century ago by Ramsden and Pickering. 1, 2 More recently, plasmonic NPs at LLIs have been reported to possess novel "metal liquid like" properties 3 that have sparked a renewed interest. Driven by the growing need for cheap, fast and reproducible bottom-up assembly for nanotechnological applications, the unique optical, 4 magnetic, 5 electrical 6 and chemical 7 properties of such films has attracted intensive research in a rapidly growing field.NP assemblies at LLIs hold great promise in diverse fields ranging from electrovariable optics 8 to templates for hierarchical self assembly, 9 and plasmonic rulers. 10 One of the main benefits of localising NPs at a LLI for these applications is the aforementioned self-assembly. 11 Currently, most technological applications of nanoassemblies are based around solid-state fabrication. Although the control that the solid interface offers is unparalleled, it does have several drawbacks when compared to a LLI. One such drawback is topological defects -these can be introduced either during or post-manufacturing and are extremely difficult to correct. In fact it is often easier to fabricate a new device rather than attempting to repair defects. Conversely, a LLI system has the ability to self-correct without any external manipulation. 12 An additional drawback of a solid state system becomes clear when introducing the exciting concept of a plasmonic ruler. [13][14][15] The coupling between excitations of localized plasmons in NPs can allow for precise spatial information. This concept has been demonstrated between 2D arrays, 10 particle dimers 14 at solid interfaces and tethered NPs in bulk solution. 16 It has even been recently demonstrated to provide 3-dimensional structural information. 17 The use of plasmonic particles at the LLI sh...

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“…At certain wavelengths, maximum coupling from electromagnetic waves to localized surface plasmons can be achieved and these are known as the localized surface plasmon resonances (LSPRs) of the structure. LSPRs of metal nanostructures depend on properties such as the size, 10,11 shape, [12][13][14] metal material, 15 surrounding dielectric material, [16][17][18][19][20][21][22] and the charge of the metal. [23][24][25][26][27][28][29][30] Active plasmonic devices can be realized by externally tuning the LSPR of nanostructures.…”

mentioning

confidence: 99%

Shifts in plasmon resonance due to charging of a nanodisk array in argon plasma

Lapsley

Shahravan

Hao

et al. 2012

Applied Physics Letters

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A method for generating charge-induced plasmonic shifts, using argon plasma to charge nanoparticle arrays, is presented. Particles develop a negative charge, due to enhanced collisions with high-temperature electrons, in low-temperature plasmas. The negative charge generated causes a blue shift in the localized surface plasmon resonance. The dynamics of the shift were recorded and discussed. This effect could be used as a real-time method for studying the dynamics for charging in plasma. Plasmonics deals with optically excited, oscillations of electrons at the interface between a metal and a dielectric, 1 and this phenomenon has driven the development of many optical devices. 2-9 Surface plasmons excited in metal structures, confined at the nanoscale in three dimensions (i.e., nanoparticles, nanodisks, etc.), are known as localized surface plasmons. At certain wavelengths, maximum coupling from electromagnetic waves to localized surface plasmons can be achieved and these are known as the localized surface plasmon resonances (LSPRs) of the structure. LSPRs of metal nanostructures depend on properties such as the size, 10,11 shape, 12-14 metal material, 15 surrounding dielectric material, [16][17][18][19][20][21][22] and the charge of the metal. [23][24][25][26][27][28][29][30] Active plasmonic devices can be realized by externally tuning the LSPR of nanostructures. Previously, chemical/electrochemical charging was used to actively tune the LSPR of arrays of both silver 24,25,30 and gold 23,26,27,29 nanostructures; however, this process is relatively slow. In this study, a rapid shift in the LSPR of an array of gold nanodisks was induced by surrounding the particles with a low-temperature argon plasma. This shift can be explained by the charging effect of the plasma. [31][32][33][34] Charging by the plasma takes place in only seconds, where chemical/electrochemical charging can take several minutes 24 to hours. 27 This method allows real-time monitoring of the charging effect induced by low-pressure plasmas and could be utilized for photonics applications based on the LSPR shift.In the experiment, the optical extinction spectrum of an array of gold nanodisks was measured while generating plasma. An array of gold nanodisks (diameters of 120 nm, thicknesses of 30 nm, and a periodicity of 300 nm) was fabricated on glass via electron-beam lithography. 35 A custom vacuum chamber was designed to include two flat, parallel windows to allow transmission of a probe light (Fig. 1(a)). The nanodisk array was placed inside the vacuum chamber where it was attached to one of the flat windows. The probe light, ejected from the input optical fiber and collimated by a lens, traveled through the vacuum chamber and the sample. The output light was collected by the output lens/optical fiber and delivered to an optical spectrometer. A vacuum system was used to evacuate the chamber to a base pressure of 150 mTorr. Argon was introduced into the chamber using a mass flow controller. The argon gas was introduced at a flow rate of 6 SCCM ...

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Plasmon Coupling in Two-Dimensional Arrays of Silver Nanoparticles: II. Effect of the Particle Size and Interparticle Distance

Cited by 107 publications

References 32 publications

Ab initio calculations of optical properties of silver clusters: cross-over from molecular to nanoscale behavior

Ab initio calculations of optical properties of silver clusters: cross-over from molecular to nanoscale behavior

Plasmonic Ruler at the Liquid–Liquid Interface

Shifts in plasmon resonance due to charging of a nanodisk array in argon plasma

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