Fabrication of Ag-Au bimetallic nanoparticles by laser-induced dewetting of bilayer films

Oh, Yeonsu; Lee, Won Jin; Lee, Myeongkyu

doi:10.1016/j.apsusc.2017.11.245

Cited by 74 publications

(33 citation statements)

References 45 publications

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“…Full Width at Half Maximum (FWHM)) of plasmon resonance. For instance, a single plasmonic metal nanoparticle or nanostructure is made by either chemicalsynthesis [13] or thin film evaporation deposition [14]. A single metallic nanostructure is composed of ordered grains, called a mono-metallic nanoensemble.…”

Section: Introductionmentioning

confidence: 99%

“…A metallic nanoalloy is fabricated by thermal annealing process, pursuing the new permittivity of alloy materials to control a desirable plasmon resonance wavelength. On the contrary, bimetallic nanocomposites have a quite small grain size, ranging from sub-nanoscale to Angstrom [12,14]. The spectral responses of bimetallic nanocomposites depending on the grain or the unit size are still unknown as well.…”

Section: Introductionmentioning

confidence: 99%

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Au/Ag Bimetallic Nanocomposites as a Highly Sensitive Plasmonic Material

et al. 2018

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We report Au/Ag bimetallic nanocomposites as a highly sensitive plasmonic material. A unit approach via a three-dimensional numerical modeling is introduced to observe collective plasmon resonance in Au/Ag bimetallic nanocomposites as well as Au mono-metallic nanoensembles. Au nanoensembles provide consistently identical plasmon wavelength, independent of inter-unit distance. In analogy with mono-metallic nanoensembles, Au/Ag bimetallic nanocomposites distinctly feature converging dual plasmon resonance peaks to a single plasmon resonance peak, strongly depending on the packing density and the unit size. An effective unit size of bimetallic nanocomposites is below 2.5 nm in a subwavelength structure, which is small enough to feature bimetallic nanocomposites. As a result, the Au/Ag bimetallic nanocomposites clearly show exceptionally high sensitivity and figure-ofmerit (approximately 3 fold of conventional plasmon sensitivity and 4.3 fold of conventional plasmon FOM), resulting from coupled Au-Ag quadrupole bimetallic nanounits. This study provides essential rationales for Au/Ag bimetallic nanocomposites serving as a desirable and alternative plasmonic material for advanced nanoplasmonic sensing technologies.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Au/Ag Bimetallic Nanocomposites as a Highly Sensitive Plasmonic Material

et al. 2018

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“…In many such applications, it is desirable to pattern metallic nanoparticles on the substrate surface. This is commonly performed using a laser dewetting process [13][14][15][16]. The literature contains many studies on the formation of metallic nanoparticles through laser dewetting [17].…”

Section: Introductionmentioning

confidence: 99%

Effects of Accumulated Energy on Nanoparticle Formation in Pulsed-Laser Dewetting of AgCu Thin Films

et al. 2021

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Ag50Cu50 films were deposited on glass substrates by a sputtering system. Effects of accumulated energy on nanoparticle formation in pulse-laser dewetting of AgCu films were investigated. The results showed that the properties of the dewetted films were found to be dependent on the magnitude of the energy accumulated in the film. For a low energy accumulation, the two distinct nanoparticles had rice-shaped/Ag60Cu40 and hemispherical/Ag80Cu20. Moreover, the absorption spectra contained two peaks at 700 nm and 500 nm, respectively. By contrast, for a high energy accumulation, the nanoparticles had a consistent composition of Ag60Cu40, a mean diameter of 100 nm and a peak absorption wavelength of 550 nm. Overall, the results suggest that a higher Ag content of the induced nanoparticles causes a blue shift of the absorption spectrum, while a smaller particle size induces a red shift.

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“…The feasibility of pulsed laser-induced dewetting, especially using nanosecond pulses, has attracted significant attention in the literature [24][25][26][27][28][29][30]. However, only scant information is available regarding the synthesis of metallic NPs using a high repetition rate laser.…”

Section: Introductionmentioning

confidence: 99%

Antifungal Properties of Pure Silver Films with Nanoparticles Induced by Pulsed-Laser Dewetting Process

Lin

Wang

et al. 2020

Applied Sciences

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Silver particles were prepared by dewetting Ag films coated on glass using a fiber laser. The size of the particles was controlled in the range of 92 nm–1.2 μm by adjusting the thickness of the Ag film. The structural properties and surface roughness of the particles were evaluated by means of scanning electron microscopy. In addition, the antifungal activity of the Ag particles was examined using spore suspensions of Colletotrichum gloeosporioides. It is shown that particles with a size of 1.2 μm achieved 100% inhibition of conidia growth of C. gloeosporioides after a contact time of just 5 min. Furthermore, the smaller particles also achieved good antifungal activity given a longer contact time. Similar results were observed for spore germination and pathogenicity tests performed on mango fruit and leaves. Overall, the results confirm that Ag particles have an excellent antifungal effect on C. gloeosporioides.

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Fabrication of Ag-Au bimetallic nanoparticles by laser-induced dewetting of bilayer films

Cited by 74 publications

References 45 publications

Au/Ag Bimetallic Nanocomposites as a Highly Sensitive Plasmonic Material

Au/Ag Bimetallic Nanocomposites as a Highly Sensitive Plasmonic Material

Effects of Accumulated Energy on Nanoparticle Formation in Pulsed-Laser Dewetting of AgCu Thin Films

Antifungal Properties of Pure Silver Films with Nanoparticles Induced by Pulsed-Laser Dewetting Process

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