Surface plasmon resonance tuning of Ag nanoisland films using a CO<sub>2</sub> laser

Faniayeu, Ihar; Ishimatsu, Yuki; Nakajima, Takashi

doi:10.1088/1361-6463/ab1b7b

Cited by 4 publications

(4 citation statements)

References 35 publications

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“…For OLED, a lot of research has focused on its transparent and conductive anodes [6][7][8][9][10], while little attention is paid to the cathode. At present, vacuum evaporation is the most common method for the preparation of silver or aluminium thin-film electrodes or other films [11][12][13]. As is well known, the thin-film electrodes prepared by vacuum evaporation possess high conductivity, good smoothness and extremely thin thickness; however, vacuum evaporation is also limited owing to insurmountable shortcomings such as expensive equipment, complicated vacuuming processes and low economic efficiency.…”

Section: Introductionmentioning

confidence: 99%

Facile preparation of high conductive silver electrodes by dip-coating followed by quick sintering

et al. 2020

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With polyol-synthesized silver nanoparticles (AgNPs) as raw materials, the silver electrodes with high conductivity were fabricated via a dip-coating method followed by sintering process, and the effects of the dip-coating and sintering process on the conductivity and surface roughness of silver electrodes were investigated in detail. The silver film with a thickness of 1.97 µm and a roughness of about 2 nm can be prepared after dip-coating at a pulling rate of 500 µm s −1 for 40 coating times. The non-conductive dip-coated silver films are transformed into conductive silver electrodes after conventional sintering in a muffle oven, infrared sintering and microwave sintering, respectively. Compared with high sintering temperature and long sintering time of conventional sintering and infrared sintering, microwave sintering can achieve quick sintering of silver films to fabricate high conductive silver electrodes. The silver electrodes with a sheet resistance of 0.75 Ω sq −1 and a surface roughness of less than 1 nm can be obtained after microwave sintering at 500 W for 50 s. The adjustable dip-coating method followed by quick microware sintering is an appropriate approach to prepare high conductive AgNPs-based electrodes for organic light-emitting diodes or other devices.

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Section: Introductionmentioning

confidence: 99%

Facile preparation of high conductive silver electrodes by dip-coating followed by quick sintering

et al. 2020

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“…The laser beam diameter is ~10 mm at the position of the film with a Gaussian spatial profile. This means that the effective laser power density is different as a function of distance from the irradiation center [23]. Although it is technically possible to make the spatial profile of the laser beam to a nearly flat-top by introducing a commercial beam shaper we use the laser beam as it is in this work.…”

Section: Lasermentioning

confidence: 99%

“…Substrate heating with a CO2 laser is a versatile method to fabricate functional films, and it can be used not only to promote the reduction speed of metallic ions dispersed in a polymer matrix (so-called metal-polymer nanocomposite films) but also to induce solid-state dewetting of metallic films (socalled nanostructured metallic films). Indeed, we have recently shown that the irradiation of a non-focused CO2 laser beam onto thin metallic films for a few tens of seconds at a few W enables us to rapidly induce nanostructures in thin Au [22] and Ag films [23] with some notable differences between them.…”

Section: Introductionmentioning

confidence: 99%

Size-controlled in situ synthesis of metal–polymer nanocomposite films using a CO2 laser

2020

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In-situ synthesis of metal-polymer nanocomposite films by irradiating a CO2 laser for several seconds is a new alternative to fabricate metal-polymer nanocomposite films. The main features of this method are that the number density of the synthesized metal nanoparticles is very high so that the optical density easily exceeds 0.5~1.5 for the film thickness of ~200 nm, and owing to the short fabrication time and the use of non-focused laser beam, largescale processing is possible. For this technique to be applicable for a variety of purposes an important question is how and how much we can control the film properties. In this work we demonstrate that the size and size distribution of metallic nanoparticles in the synthesized nanocomposite films can be well-controlled by the choice of the laser power and irradiation time as well as the concentrations of nanoparticle precursor. Properties of the synthesized films can be roughly understood by considering the diffusion of metallic ions, atoms, and nanoparticles in the polymer film under the elevated temperature induced by the CO2 laser.

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“…Alternatively, laser annealing with mid-infrared lasers, such as CO2 laser, do not necessarily need to be focused since their energy is mainly get absorbed by the substrate (typically quartz, silicon, or glass) which will rapidly be heated to high temperatures enough to initiate the solid-state dewetting process. Solid-state-dewetting of plasmonic metal films by a CO2 laser is already been reported for different applications (20,21,22).…”

Section: Introductionmentioning

confidence: 99%

Laser Annealing of Gold Thin Films as a Platform for Plasmonic Sensing Applications

2022

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The future of the plasmonic devices is heavily challenged by the nanoconstruction schemes of metals which often require rather fast, low-cost, and high-throughput fabrication techniques. Laser annealing is considered to be an unrivaled tool for surface manipulation of thin metallic films, especially with functional plasmonic devices of pre-determined morphology. Herein, a commercial CW CO2 laser, wavelength of 10.6 µm and optimum power of 15W, has been used for surface reconstruction of thin Au films, with an initial film thickness of 15 nm (±3 nm) sputtered on quartz substrates, as plasmonic sensing platforms. The effect of two main laser parameters on the Au film morphology have been explored namely power density and scanning speed. Thermal annealing of Au nanostructured films by the electrical furnace is also been studied. UV-Visible (UV-Vis) spectroscopy characterization measurements is utilized to monitor the the plasmonic induced optical absorption changes with different experimental conditions. Surface annealed Au nanofilms were then used as a plasmonic sensing substrate to detect the size and density variation of Ag NPs, fabricated by pulsed Nd: YAG laser ablation, ith pulse duration of 7 nsec, in DI water with a wavelength of 1064 nm and different laser energies, imbedded in a solution-processed thin dielectric material (CeO2 NPs) to form a composite film. Our plasmonic sensing structure shows a remarkable detection to variable concentrations of Ag NPs reflected by a significant red-shift in the plasmonic resonance absorption of Au nanostructures with laser ablation energy at a fixed number of pulses of 50 (1Hz).

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Surface plasmon resonance tuning of Ag nanoisland films using a CO₂ laser

Cited by 4 publications

References 35 publications

Facile preparation of high conductive silver electrodes by dip-coating followed by quick sintering

Facile preparation of high conductive silver electrodes by dip-coating followed by quick sintering

Size-controlled in situ synthesis of metal–polymer nanocomposite films using a CO2 laser

Laser Annealing of Gold Thin Films as a Platform for Plasmonic Sensing Applications

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Surface plasmon resonance tuning of Ag nanoisland films using a CO2 laser

Cited by 4 publications

References 35 publications

Facile preparation of high conductive silver electrodes by dip-coating followed by quick sintering

Facile preparation of high conductive silver electrodes by dip-coating followed by quick sintering

Size-controlled in situ synthesis of metal–polymer nanocomposite films using a CO2 laser

Laser Annealing of Gold Thin Films as a Platform for Plasmonic Sensing Applications

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Surface plasmon resonance tuning of Ag nanoisland films using a CO₂ laser