Laser-Induced Reductive Sintering of Nickel Oxide Nanoparticles under Ambient Conditions

Paeng, Dongwoo; Lee, Daeho; Yeo, Junyeob; Yoo, Jae‐Hyuck; Allen, Frances; Kim, Eunpa; So, Hongyun; Park, Hee K.; Minor, Andrew M.; Grigoropoulos, Costas P.

doi:10.1021/jp512776p

Cited by 70 publications

(53 citation statements)

References 54 publications

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“…Furthermore, liquid-phase PLA permits the collection of synthesized nanoparticles much more easily than PLA in vacuum. Many researchers have reported the formation of unique nanoparticles by changing the liquid medium or by adding some chemical compounds into the medium [22,23,25,27]. Namely, this superimposes the chemical reactivity of the liquid onto the physical process of laser ablation.…”

Section: Introductionmentioning

confidence: 99%

Nickel nanoparticles generated by pulsed laser ablation in liquid CO2

et al. 2015

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Nickel nanoparticles with various structures were synthesized by a pulsed laser ablation process in liquid CO 2 at 17°C and 5.2 MPa. A nickel plate immersed in liquid CO 2 was used as a target. This was irradiated by a laser beam with a fundamental wavelength of 1064 nm at 2.46 mJ for 15 min. The generated particles were deposited on a silicon wafer after natural evaporation of the liquid CO 2 , and analyzed by field emission scanning electron microscopy, scanning electron microscopy with energy-dispersive X-ray spectroscopy, and transmission electron microscopy. Nickel and carbon particles with sphere-like structures or apple-shaped structures were observed. Furthermore, characteristic nickel/carbon particles with core/shell structures were also produced. The generated particles ranged in size between 5 and 350 nm in diameter, with dominant sizes under 50 nm.

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Section: Introductionmentioning

confidence: 99%

Nickel nanoparticles generated by pulsed laser ablation in liquid CO2

et al. 2015

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“…Recently, Ag[3a,13] and Cu grids have emerged as next‐generation flexible transparent conductors owing to their high conductivities, high transmittances, and low processing temperatures. In the recent study,[8b] Ni electrode grids on a glass substrate were demonstrated as a transparent conducting panel for touch screen application. However, the Ni electrode grids failed to concurrently satisfy transparency and flexibility since PI is the only applicable flexible substrate, as mentioned above.…”

Section: Resultsmentioning

confidence: 99%

Highly Stable Ni‐Based Flexible Transparent Conducting Panels Fabricated by Laser Digital Patterning

Nam

Shin

Yoon

et al. 2019

Adv Funct Materials

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110

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A novel simple laser digital patterning process to fabricate Ni-based flexible transparent conducting panels using solution-processed nonstoichiometric nickel oxide (NiO x ) thin films and their applications for flexible transparent devices are reported in this study. A largescale synthesis route to produce NiO x nanoparticle (NP) ink is also demonstrated. A low-power continuous-wave laser irradiation photothermochemically reduces and sinters selected areas of a NiO x NP thin film to produce Ni electrode patterns. Owing to the innovative NiO x NP ink and substantially lowered applied laser power density, Ni conductors can be fabricated, for the first time to the best of the authors' knowledge, even on a polyethylene terephthalate substrate, which is known to have one of the lowest glass-transition temperatures among polymers. The resultant Ni electrodes exhibit a high-temperature oxidation resistance up to approximately 400 °C, and high corrosion resistance in tap water and even in seawater. Moreover, a superior mechanical stability of the Ni conductors is confirmed by tape-pull, ultrasonic-bath, bending/twisting, and cyclic bending (up to 10 000 cycles) tests. Finally, flexible transparent touch screen panels and electrical heaters are fabricated with mesh-type Ni conductors to demonstrate possible applications.market. However, ITO suffers from several limitations such as brittleness and lack of flexibility of ITO layers, and costly deposition method requiring vacuum-based equipment, which hinders its application to the next-generation electronics, particularly to flexible or stretchable electronics. Therefore, the demand for alternative materials and deposition methods of TCEs is rapidly increasing. Among alternatives to conventional deposition or patterning methods for conducting/semiconducting electrodes, a laser digital patterning process on solution-processed nanoparticle (NP) thin films [2] has recently attracted significant attention since it enables to achieve a photolithography-free, low-cost, and ondemand electrode fabrication. The laser digital patterning process, in particular, can be applied to fabricate flexible electronic devices owing to lowered thermal stress exerting on thermally vulnerable polymer substrates (see expanded discussion in Section S1, Supporting Information). As materials for laser digital patterning in the early stage, NPs or nanocomposites composed of noble metals such as Ag or Au have been widely employed [3] because these nanomaterials are oxidation resistant, and thus can be easily formed to conducting electrodes simply by sintering. However, nowadays, there is an increasing demand to diversify the electrode materials not only owing to the high price of the noble metals but also particularly owing to the need for unique properties of relevant Flexible Conducting PanelsThe ORCID identification number(s) for the author(s) of this article can be found under https://doi.

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“…[ 20 ] Using thermal and chemical energy, electrons and metal ions are separated, and metals are extracted through combination of separated electrons and metal ions. [ 21,22 ] Such reduction process is being widely applied for diverse metallic oxides (TiO 2 , NiO, GO, Cu x O) to convert oxides into their metallic counterparts, [23][24][25][26] however, the existing processes are limited to nanoparticles (NPs). In the NP reduction process, the target NPs are not only reduced, but also merged together simultaneously by the applied large thermal energy.…”

Section: Doi: 101002/adma201503244mentioning

confidence: 99%

Nanorecycling: Monolithic Integration of Copper and Copper Oxide Nanowire Network Electrode through Selective Reversible Photothermochemical Reduction

et al. 2015

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Laser induced selective photothermochemical reduction is demonstrated to locally and reversibly control the oxidation state of Cu and Cu oxide nanowires in ambient conditions without any inert gas environment. This new concept of "nanorecycling" can monolithically integrate Cu and Cu oxide nanowires by restoring oxidized Cu, considered unusable for the electrode, back to a metallic state for repetitive reuse.

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Laser-Induced Reductive Sintering of Nickel Oxide Nanoparticles under Ambient Conditions

Cited by 70 publications

References 54 publications

Nickel nanoparticles generated by pulsed laser ablation in liquid CO2

Nickel nanoparticles generated by pulsed laser ablation in liquid CO2

Highly Stable Ni‐Based Flexible Transparent Conducting Panels Fabricated by Laser Digital Patterning

Nanorecycling: Monolithic Integration of Copper and Copper Oxide Nanowire Network Electrode through Selective Reversible Photothermochemical Reduction

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