Local Structure-Driven Localized Surface Plasmon Absorption and Enhanced Photoluminescence in ZnO-Au Thin Films

Chamorro‐Coral, William; Ghanbaja, Jaâfar; Battie, Yann; Naciri, A. En; Soldera, F.; Mücklich, Frank; Horwat, David

doi:10.1021/acs.jpcc.6b09974

Cited by 34 publications

(21 citation statements)

References 44 publications

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“…Recently, however, it has been established that this optical limitation on the light extraction efficiency can be overcome by using a nanostructured gold thin-film surface coating, which has been found to significantly enhance that ZnO NBE emission output. [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] Increase in the ZnO NBE luminescence intensity due to Au nanoparticle (NP) surface coatings have been attributed to the formation of an additional fast relaxation channel due to dipole-dipole coupling between excitons and NP plasmon modes, which increases the spontaneous emission rate (SER). [29][30][31] However, this mechanism is unlikely to be an efficient process for gold/ZnO systems because of the large energy difference between the ZnO exciton UV NBE emission at around 3.37 eV and the Au NP longitudinal surface plasmon (LSP) resonance ~ 2.5 eV.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of the UV emission from gold/ZnO nanorods exhibiting no green luminescence

Fiedler¹,

Lem²,

Hoffmann³

et al. 2020

Opt. Mater. Express

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Large reflection losses at interfaces in light emitting semiconductor devices cause a significant reduction in their light emission and energy efficiencies. Metal nanoparticle (NP) surface coatings have been demonstrated to increase the light extraction efficiency from planar high refractive index semiconductor surfaces. This emission enhancement in Au NP-coated ZnO is widely attributed to involvement of a green (~ 2.5 eV) deep level ZnO defect exciting localized surface plasmons in the NPs that non-radiatively decay into hot electrons, which return to ZnO and radiatively recombine. In this work, we achieve a 6 times enhancement of the ultra-violet excitonic emission in ZnO nanorods that are coated with 5 nm Au NPs without the aid of ZnO defects. Cathodoluminescence (CL), photoluminescence (PL) and a novel concurrent CL-PL technique as well as time resolved PL spectroscopy revealed that the increase in UV emission is due to the formation of an additional fast excitonic relaxation pathway that increases the exciton spontaneous emission rate. Concurrent CL-PL measurements ruled out the presence of charge transfer mechanism in the emission enhancement process. While time resolved PL results confirmed the existence of a new excitonic recombination channel that is attributed to exciton relaxation via the plasmon-assisted excitation of rapid non-radiative Au interband transitions. Our results establish that ZnO defect levels ~ 2.5 eV are not required to facilitate Au NP induced enhancement of the ZnO UV emission.

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Section: Introductionmentioning

confidence: 99%

Enhancement of the UV emission from gold/ZnO nanorods exhibiting no green luminescence

Fiedler¹,

Lem²,

Hoffmann³

et al. 2020

Opt. Mater. Express

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“…Meanwhile, phase separation phenomenon is widely observed in thin films and has been thoroughly studied in order to manipulate resulting functional properties. Different configurations could be obtained, such as the nanodispersion of metal or ceramic particles in a ceramic matrix [9,10]. Alternatively, thin films showing lateral self-separation of ceramic phases could be obtained in case of specific epitaxial relationships between phases or between at least one phase and the substrate [11,12,13].…”

Section: Introductionmentioning

confidence: 99%

Controlling surface morphology by nanocrystalline/amorphous competitive self-phase separation in thin films: Thickness-modulated reflectance and interference phenomena

et al. 2019

Self Cite

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Controlling surface morphology is a key issue for obtaining functional materials with surface-based properties. In this paper, we explore the possibility of using the self-separation of phases as a way of controlling the surface morphology features. We demonstrate using X-ray diffraction and transmission electron microscopy that a competitive self-separation of a nanocrystalline and an amorphous phases occurs in co-sputtered Zr-Mo thin films with a Mo content of 60 at%, corresponding to a composition intermediate to those necessary to form single-phased amorphous and nanocrystalline films. The dependence of the residual stress with the thickness at the biphased composition is discussed in terms of the morphology evolution and a possible mechanism for the self-separation of phases is presented. We show that the self-separation of phases as presented here is not limited to Zr-Mo alloys and can be extended to other systems. By changing the film thickness, it is possible to change the surface morphology of the films at the biphasic composition, due to the competitive growth of the nanocrystalline phase in the amorphous phase. In this way, it was possible to control the surface roughness and, because of this, tuning the film reflectance at a determined wavelength. The occurrence of an interference pattern in the reflectance spectra was discussed and associated to the presence of two different height levels at the film surface.

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“…The photocatalytic performance of ZnO nanostructures under visible light can be enhanced by doping with transition metals and noble metal NPs. Typical transition metal dopants include copper (Cu), iron (Fe), cobalt (Co), manganese (Mn), nickel (Ni) and chromium (Cr) [100][101][102][103][104][105][106][107][108][109][110][111][112], while noble metal NPs used are gold (Au), and silver (Ag) [113][114][115][116][117][118][119]. The ionic radius of Zn 2+ , Co 2+ , Cu 2+ , and Mn 2+ is 0.074, 0.072, 0.073, and 0.080 nm, respectively [100,106].…”

Section: Transition Metal Doped Znomentioning

confidence: 99%

Recent Advances in Zinc Oxide Nanostructures with Antimicrobial Activities

Liao

Tjong

2020

IJMS

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This article reviews the recent developments in the synthesis, antibacterial activity, and visible-light photocatalytic bacterial inactivation of nano-zinc oxide. Polycrystalline wurtzite ZnO nanostructures with a hexagonal lattice having different shapes can be synthesized by means of vapor-, liquid-, and solid-phase processing techniques. Among these, ZnO hierarchical nanostructures prepared from the liquid phase route are commonly used for antimicrobial activity. In particular, plant extract-mediated biosynthesis is a single step process for preparing nano-ZnO without using surfactants and toxic chemicals. The phytochemical molecules of natural plant extracts are attractive agents for reducing and stabilizing zinc ions of zinc salt precursors to form green ZnO nanostructures. The peel extracts of certain citrus fruits like grapefruits, lemons and oranges, acting as excellent chelating agents for zinc ions. Furthermore, phytochemicals of the plant extracts capped on ZnO nanomaterials are very effective for killing various bacterial strains, leading to low minimum inhibitory concentration (MIC) values. Bioactive phytocompounds from green ZnO also inhibit hemolysis of Staphylococcus aureus infected red blood cells and inflammatory activity of mammalian immune system. In general, three mechanisms have been adopted to explain bactericidal activity of ZnO nanomaterials, including direct contact killing, reactive oxygen species (ROS) production, and released zinc ion inactivation. These toxic effects lead to the destruction of bacterial membrane, denaturation of enzyme, inhibition of cellular respiration and deoxyribonucleic acid replication, causing leakage of the cytoplasmic content and eventual cell death. Meanwhile, antimicrobial activity of doped and modified ZnO nanomaterials under visible light can be attributed to photogeneration of ROS on their surfaces. Thus particular attention is paid to the design and synthesis of visible light-activated ZnO photocatalysts with antibacterial properties

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Local Structure-Driven Localized Surface Plasmon Absorption and Enhanced Photoluminescence in ZnO-Au Thin Films

Cited by 34 publications

References 44 publications

Enhancement of the UV emission from gold/ZnO nanorods exhibiting no green luminescence

Enhancement of the UV emission from gold/ZnO nanorods exhibiting no green luminescence

Controlling surface morphology by nanocrystalline/amorphous competitive self-phase separation in thin films: Thickness-modulated reflectance and interference phenomena

Recent Advances in Zinc Oxide Nanostructures with Antimicrobial Activities

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