Characteristic time scales of coalescence of silver nanocomposite and nanoparticle films induced by continuous wave laser irradiation

Paeng, Dongwoo; Lee, Daeho; Grigoropoulos, Costas P.

doi:10.1063/1.4893465

Cited by 23 publications

(14 citation statements)

References 25 publications

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“…Such an evolvement of an effectively two‐dimensional meander network and the growth of the structures with increasing laser fluence is also found for laser‐sintered films of Si nanoparticles, for SiGe alloy nanoparticles and for composite powders of Si and Ge nanoparticles. Very similar structures have been reported in the literature for other materials, many of them in the context of (pulsed) laser‐sintering . The formation of these particular structures is caused by surface tension effects.…”

Section: Processing To Nanocrystalline Bulk and Laser‐sintered Thin Fsupporting

confidence: 77%

Silicon‐based nanocomposites for thermoelectric application

Schierning

Stoetzel

Chavez

et al. 2016

Physica Status Solidi (a)

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Here we present the realization of efficient and sustainable silicon‐based thermoelectric materials from nanoparticles. We employ a gas phase synthesis for the nanoparticles which is capable of producing doped silicon (Si) nanoparticles, doped alloy nanoparticles of silicon and germanium (Ge), SixGe1–x, and doped composites of Si nanoparticles with embedded metal silicide precipitation phases. Hence, the so‐called “nanoparticle in alloy” approach, theoretically proposed in the literature, forms a guideline for the material development. For bulk samples, a current‐activated pressure‐assisted densification process of the nanoparticles was optimized in order to obtain the desired microstructure. For thin films, a laser annealing process was developed. Thermoelectric transport properties were characterized on nanocrystalline bulk samples and laser‐sintered‐thin films. Devices were produced from nanocrystalline bulk silicon in the form of p–n junction thermoelectric generators, and their electrical output data were measured up to hot side temperatures of 750 °C. In order to get a deeper insight into thermoelectric properties and structure forming processes, a 3D‐Onsager network model was developed. This model was extended further to study the p–n junction thermoelectric generator and understand the fundamental working principle of this novel device architecture. Gas phase synthesis of composite nanoparticles; nanocrystalline bulk with optimized composite microstructure; laser‐annealed thin film.

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Section: Processing To Nanocrystalline Bulk and Laser‐sintered Thin Fsupporting

confidence: 77%

Silicon‐based nanocomposites for thermoelectric application

Schierning

Stoetzel

Chavez

et al. 2016

Physica Status Solidi (a)

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“…8,9 Several optical probing techniques have been developed for studying laser-material interactions. 10,11 For example, timeresolved shadowgraphy has been utilized to directly observe the ablation process in the nanosecond time regime, [12][13][14] capturing the ejected plume and shockwave emission at certain delay times. 15 Nevertheless, even in the simplest case of metal films, the induced phase change and the ensuing dewetting and ablation processes have not yet been fully investigated.…”

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confidence: 99%

Time-resolved analysis of thickness-dependent dewetting and ablation of silver films upon nanosecond laser irradiation

Paeng

Yeo

et al. 2016

Applied Physics Letters

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Nanosecond pulsed laser dewetting and ablation of thin silver films is investigated by time-resolved imaging. Laser pulses of 532 nm wavelength and 5 ns temporal width are irradiated on silver films of different thicknesses (50 nm, 80 nm, and 350 nm). Below the ablation threshold, it is observed that the dewetting process does not conclude until 630 ns after the laser irradiation for all samples, forming droplet-like particles in the spot central region. At higher laser intensities, ablative material removal occurs in the spot center. Cylindrical rims are formed in the peripheral dewetting zone due to the solidification of transported matter at about 700 ns following the laser pulse exposure. In addition to these features, droplet fingers are superposed upon irradiation of 350-nm thick silver films with higher intensity.

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“…Practically, single laser sintering involves a large number of nanoparticles, and the overall process should be examined in a more macroscopic perspective. Paeng et al [16] suggested that silver nanoparticle film under continuous wave-laser irradiation goes through certain steps of initial contact, neck growth, and coalescence for complete sintering, and the macroscopic coalescence time measured from pump-and-probe technique is around 10 ms. This value is in accordance with the time lag between laser irradiation and conductive metal electrode formation that was measured by transient resistance change during the laser irradiation on silver nanoparticle ink as shown in Figure 2(b) [9].…”

Section: Mechanismmentioning

confidence: 99%

Selective Laser Sintering of Nanoparticles

Hong¹

2018

Sintering of Functional Materials

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Selective laser sintering of nanoparticles has received much attention recently as it enables rapid fabrication of functional layers including metal conductors and metal-oxide electrodes on heat-sensitive polymer substrate in ambient conditions. Photothermal reactions induced by lasers rapidly increase the local temperature of the target nanoparticle in a highly selective manner, and subsequent sintering steps including melting and coalescence between nanoparticles occur to fabricate interconnected sintered films for various future applications. The mechanism of laser sintering, as well as possible target materials subject to laser sintering, together with experimental schemes developed to improve the process and potential applications, is briefly summarized in this chapter.

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Characteristic time scales of coalescence of silver nanocomposite and nanoparticle films induced by continuous wave laser irradiation

Cited by 23 publications

References 25 publications

Silicon‐based nanocomposites for thermoelectric application

Silicon‐based nanocomposites for thermoelectric application

Time-resolved analysis of thickness-dependent dewetting and ablation of silver films upon nanosecond laser irradiation

Selective Laser Sintering of Nanoparticles

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