Optical Scattering by Dense Disordered Metal Nanoparticle Arrays

Prikulis, Juris; Malinovskis, Uldis; Popļausks, Raimonds; Apsite, Indra; Bergs, Gatis; Erts, Donāts

doi:10.1007/s11468-013-9639-2

Cited by 14 publications

(17 citation statements)

References 39 publications

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“…It is a very universal template for hosting many different materials. In our previous works, PAAO was used to produce nanowires of germanium [16], antimony sulfide [17], gold [18], arrays of metal and diamond nanoparticles [19][20][21], as well as different types of nanostructured metal-insulator-metal systems [22,23]. Recently ZnO NR arrays in PAAO templates were produced using atomic layer deposition (ALD) [24][25][26][27][28], a technique that is capable to uniformly coat surfaces with a nearly arbitrary topology, including pores with high aspect ratio [29].…”

Section: Introductionmentioning

confidence: 99%

Visible Photoluminescence of Variable-Length Zinc Oxide Nanorods Embedded in Porous Anodic Alumina Template for Biosensor Applications

et al. 2021

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Zinc oxide (ZnO) and porous anodic aluminum oxide (PAAO) are technologically important materials, rich with features that are of interest in optical applications, for example, in light-emitting and sensing devices. Here, we present synthesis method of aligned ZnO nanorods (NR) with 40 nm diameter and variable length in 150 to 500 nm range obtained by atomic layer deposition (ALD) of ZnO in pores of continuously variable thickness PAAO. The relative intensity of yellow (1.99 eV), green (2.35 eV), and blue (2.82 eV) photoluminescence (PL) components originating from the different types of defects, varied with non-monotonic dependency on the composite film thickness with a Fabry–Pérot like modulation. The intensity variation of any individual PL component correlated well with anti-reflective properties of ZnO NR–PAAO composite film at the peak wavelength of the particular PL component. This provides a route for selective enhancement or suppression of color components of hybrid fluorescent emitters by tuning only geometric parameters, with potential use in imaging and other optical devices. As an application example we tested the composite film for sensing of vascular endothelial growth factor (VEGF) using a widely accessible fluorescence microscopy setup. The intensity of the yellow and green PL components reduced in response to increased VEGF concentrations, whereas blue component remained invariant.

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Section: Introductionmentioning

confidence: 99%

Visible Photoluminescence of Variable-Length Zinc Oxide Nanorods Embedded in Porous Anodic Alumina Template for Biosensor Applications

et al. 2021

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“…Lithographic top-down fabrication of hybrid systems with the predetermined geometry for plasmonic PL enhancement is possible [24], but it is a relatively time consuming and expensive process for scalable production. Masked deposition through self-organized templates such as nanoporous anodic alumina (NAA) films [25] can produce exceptionally high density arrays of isolated NP, that support new collective resonant modes [26] for interferometric sensors, however, particle properties in this technique cannot be tuned independently from template geometry.…”

Section: Introductionmentioning

confidence: 99%

Deposition of colloidal metal nanoparticles on zinc oxide nanorods and their influence on visible photoluminescence

Kulmatova¹,

Baitimirova²,

Malinovskis³

et al. 2021

physics

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We examine the influence of colloidal Au and Ag nanoparticles (NP) on hydrothermally grown ZnO nanorods (NR). Individual 60 nm diameter NP and small NP assemblies without formation of large aggregates were deposited on poly-L-lysine covered NR films using the dip-coating method. The evaluation of morphological and optical properties of the obtained ZnO-metal hybrids was done using scanning electron microscopy, photoluminescence (PL) and diffuse reflection spectroscopy. The presence of Au NP selectively suppressed the PL components near 560 nm wavelength associated with ZnO surface defects, whereas equally sized Ag NP resulted in a much smaller change of PL signal, barely above the noise level. The presented results may be useful for tuning the optical properties of hybrid materials in development of sensor or photovoltaic devices.

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“…Periodic NPAs can also form photonic crystals, which often are produced by close-packed colloid assemblies [10]. Arrays with some degree of disorder may exhibit new effects, such as phase shifts or change of polarization [11] that can be used for interferometric sensing of biomolecules [12,13]. However, reliable, reproducible, and cost-effective production of the nanoparticle array substrates for label-free sensor architectures remains challenging.…”

Section: Introductionmentioning

confidence: 99%

High-Density Plasmonic Nanoparticle Arrays Deposited on Nanoporous Anodic Alumina Templates for Optical Sensor Applications

et al. 2019

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This study demonstrates a new, robust, and accessible deposition technique of metal nanoparticle arrays (NPAs), which uses nanoporous anodic alumina (NAA) as a template for capillary force-assisted convective colloid (40, 60, and 80 nm diameter Au) assembly. The NPA density and nanoparticle size can be independently tuned by the anodization conditions and colloid synthesis protocols. This enables production of non-touching variable-density NPAs with controllable gaps in the 20–60 nm range. The NPA nearest neighbor center distance in the present study was fixed to 100 nm by the choice of anodization protocol. The obtained Au NPAs have the resonant scattering maxima in the visible spectral range, with a refractometric sensitivity, which can be tuned by the variation of the array density. The thickness of the NAA layer in an Aluminum-NAA-NPA multilayer system enables further tuning of the resonance frequency and optimization for use with specific molecules, e.g., to avoid absorption bands. Applicability of the mentioned multilayers for colorimetric refractive index (RI) sensing is demonstrated. Their use as Surface-Enhanced Raman Scattering (SERS) substrates is tested using hemoglobin as a biological probe molecule.

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Optical Scattering by Dense Disordered Metal Nanoparticle Arrays

Cited by 14 publications

References 39 publications

Visible Photoluminescence of Variable-Length Zinc Oxide Nanorods Embedded in Porous Anodic Alumina Template for Biosensor Applications

Visible Photoluminescence of Variable-Length Zinc Oxide Nanorods Embedded in Porous Anodic Alumina Template for Biosensor Applications

Deposition of colloidal metal nanoparticles on zinc oxide nanorods and their influence on visible photoluminescence

High-Density Plasmonic Nanoparticle Arrays Deposited on Nanoporous Anodic Alumina Templates for Optical Sensor Applications

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