Wafer-scale self-assembled plasmonic thin films

Desireddy, Anil; Joshi, Chakra P.; Sestak, Michelle N.; Little, Scott; Kumar, Santosh; Podraza, Nikolas J.; Marsillac, Sylvain; Collins, R. W.; Bigioni, Terry P.

doi:10.1016/j.tsf.2011.03.111

Cited by 13 publications

(11 citation statements)

References 49 publications

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“…Control samples, namely bare quartz, a 2D array of AuNPs and quartz coated with titania nanocrystals (for further details about the preparation of control samples, see Supplementary Information), were prepared in order to rule out different pathways for organic dye photodegradation, such as self-sensitization, 9,35 direct photolysis 36 and degradation by LSPR heating. 37 Samples for photocatalytic degradation of MB were prepared by drop-casting 40 mL of 65 mM solution of MB in MeOH on the samples (at 90 6 C) giving a dye density of about 16 nmol cm 22 . Each sample was irradiated with a 300 W Xe lamp (MAX-302; Asahi Spectra Co., Ltd (Tokyo, Japan)) equipped with UV (250-385 nm), Vis (385-740 nm) and IR (750-1050 nm) mirrors and different bandpass filters (700 nm with 10 nm full-width at half-maximum filter).…”

Section: Resultsmentioning

confidence: 99%

“…14 As an alternative to organic dyes, recently metallic nanostructures have been successfully used as photosensitizers for wide bandgap semiconductors [15][16][17][18][19] thanks to their broad and strong visible absorption based on localized surface plasmon resonance (LSPR) and their excellent chemical stability. Efforts to date to produce metallic nanostructure sensitizers for wide bandgap semiconductors have focused on the development of plasmonic nanostructures that either allow fine control of the geometry (shape, size, interparticle gap distance) of the nanostructures with good reproducibility but small area, e.g., top-down techniques such as lithography, 20 or large-scale deposition with poor control of optical properties (LSPR wavelength and its width), e.g., self-assembly-based bottom-up techniques such as vapor deposition of island films 21,22 and the Langmuir-Blodgett method. 23 However, there has not been a good method of producing metallic nanostructure sensitizers for wide bandgap semiconductors with the advantages of large area, high density, fine tunable structure, mechanical durability and low cost.…”

Section: Introductionmentioning

confidence: 99%

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A visible light-driven plasmonic photocatalyst

2014

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We demonstrate a bottom-up approach to fabricating a visible light-driven titania photocatalyst device bearing an embedded two-dimensional (2D) array of gold nanoparticles (AuNPs) as a near-field light-generating layer. The device is a layered structure prepared by depositing a 2D array of AuNPs on a transparent conductive substrate (10 nm indium tin oxide (ITO) layer on quartz), coating the 2D array of AuNPs with a monolayer of trimethoxyoctylsilane (TMOS), and depositing titania nanocrystals on the anchoring molecule (TMOS) layer. The visible light activity of the device was tested using photocatalytic degradation of methylene blue (MB) by illuminating the device with visible light (700 nm light) and ultraviolet (UV) light (250-380 nm). The localized surface plasmon resonance peak of the 36 nm AuNP 2D array is around 700 nm with a full-width at half-maximum of 350 nm. In comparison with other control samples, the device showed the highest photocatalytic activity with visible irradiation, which was 1.7 times higher than that of titania with UV irradiation. The origin of the visible light activity was confirmed by both quadratic incident light power dependency and action spectrum to be plasmon-induced (near-field enhancement by AuNPs) two-photon absorption.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A visible light-driven plasmonic photocatalyst

2014

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“…Interest in the self-assembly into stable monolayers of nanoparticles with tunable electronic, optical and magnetic properties has been driven by the opportunities to design devices that are very thin yet remarkably strong [1][2][3][4][5][6][7][8][9]. The constituents of such a monolayer are typically Au and semiconductor nanocrystals (cores) that are covered with organic molecule ligands, hereafter referred to as NPs.…”

Section: Introductionmentioning

confidence: 99%

Pair and many-body interactions between ligated Au nanoparticles

Liepold

Smith

Lin

et al. 2019

The Journal of Chemical Physics

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We report the results of molecular dynamics simulations of the properties of a pseudo-atom model of dodecane thiol ligated 5-nm diameter gold nanoparticles (AuNP) in vacuum as a function of ligand coverage and particle separation in three state of aggregation, namely the isolated AuNP, isolated pair of AuNPs and a square assembly of AuNPs. Our calculations show that the ligand density along a radius emanating from the core of an isolated AuNP has the same gross features for all values of the coverage; it oscillates around a constant value up to a distance along the chain corresponding to the position of the fourth pseudo-atom, then smoothly decays to zero, reflecting both the restricted conformations of the chain near the core surface and the larger numbers of conformations available further from the core. Interaction between two AuNPs generates changes in the ligand distributions of each. We examine the structure and general shape of the ligand envelope as a function of the coverage and demonstrate that the equilibrium structure of the envelope and the deformation of that envelope generated by interaction between the NPs is coverage-dependent, so that the shape, depth and position of the minimum of the potential of mean force displays a systematic dependence on the ligand coverage.We propose an accurate analytical description of the calculated potential of mean force as a function of a set of parameters that scale linearly with the ligand coverage. Noting that the conformational freedom of the ligands implies that multiparticle induced deviations from additivity of the pair potential of mean force are likely important, we define and calculate an effective pair potential of mean force for a square configuration of particles; our definition contains, implicitly, both the three-and four-particle contributions to deviation from additivity. We find that the effective pair potential of mean force in this configuration has a different minimum and a different well depth than the isolated pair potential of mean force. Previous work has found that the three-particle contribution to deviation from additivity is

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“…Like amphiphilic molecules, these capped nanoparticles self-assemble into 2D lattices at the air-water interface. [3][4][5][6][7][8][9][10][11][12][13][14] Nanoparticles exhibit remarkable physical properties including quantum confinement, 15 plasmon resonance 9,[16][17][18][19] and superparamagnetism 5,20 Thin films composed of nanoparticles have shown potential applications in biosensors 16,19,21 , high sensitivity resonators 14 , filtration devices 22 , magnetoresistive devices 10 , and flexible electronics. [23][24][25] Langmuir monolayers in particular have remarkable mechanical properties as two-dimensional materials that can extend into the third dimension.…”

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confidence: 99%

Comparison of the Mechanical Properties of Self-Assembled Langmuir Monolayers of Nanoparticles and Phospholipids

et al. 2013

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Nanoparticles with hydrophobic capping ligands and amphiphilic phospholipids are both found to self-assemble into monolayer films when deposited on the air/water interface. By separately measuring the anisotropic stress response of these films under uniaxial compression, we obtain both the 2D compressive and shear moduli of a range of different thin nanoparticle and phospholipid films. The compressive moduli of both nanoparticle and lipid films in the solid phase are on the same order of magnitude, whereas the shear moduli of the lipid films are found to be significantly lower. Additionally, the moduli of the nanoparticle films depended substantially on the polydispersity of the constituent particles-broader size distribution lowered the stiffness of the nanoparticle film.

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Wafer-scale self-assembled plasmonic thin films

Cited by 13 publications

References 49 publications

A visible light-driven plasmonic photocatalyst

A visible light-driven plasmonic photocatalyst

Pair and many-body interactions between ligated Au nanoparticles

Comparison of the Mechanical Properties of Self-Assembled Langmuir Monolayers of Nanoparticles and Phospholipids

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