Effect of solvent and PVP on electrode conductivity in laser-induced reduction process

Lee, Hu Seung; Yang, Min-Yang

doi:10.1007/s00339-014-8970-6

Cited by 41 publications

(24 citation statements)

References 20 publications

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“…To overcome this problem, direct writing using laser-induced reduction has been proposed [1,2,3,4]. With this technology, Cu micropatterns are directly written using a laser-induced thermochemical reduction of copper oxide nanoparticles (NPs), such as CuO and Cu 2 O NPs, which are mixed with reductants and dispersants, and reduced to Cu by laser irradiation.…”

Section: Introductionmentioning

confidence: 99%

“…When a CuO NP solution containing CuO NPs, polyvinylpyrrolidone (PVP), and ethylene glycol (EG) is irradiated by continuous-wave and nanosecond-pulsed lasers, acetaldehyde generated by dehydrating EG reduces the CuO NPs to Cu NPs, which are subsequently sintered to form Cu micropatterns [1]. When using a Cu 2 O NP solution, which contains Cu 2 O NPs, 2-propanol, and PVP, 2-propanol and PVP react thermally to generate formic acid, which then reduces Cu 2 O to Cu [2].…”

Section: Introductionmentioning

confidence: 99%

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Direct Writing of Copper Micropatterns Using Near-Infrared Femtosecond Laser-Pulse-Induced Reduction of Glyoxylic Acid Copper Complex

et al. 2019

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We have fabricated Cu-based micropatterns in an ambient environment using femtosecond laser direct writing to reduce a glyoxylic acid Cu complex spin-coated onto a glass substrate. To do this, we scanned a train of focused femtosecond laser pulses over the complex film in air, following which the non-irradiated complex was removed by rinsing the substrates with ethanol. A minimum line width of 6.1 µm was obtained at a laser-pulse energy of 0.156 nJ and scanning speeds of 500 and 1000 µm/s. This line width is significantly smaller than that obtained in previous work using a CO2 laser. In addition, the lines are electrically conducting. However, the minimum resistivity of the line pattern was 2.43 × 10−6 Ω·m, which is ~10 times greater than that of the pattern formed using the CO2 laser. An X-ray diffraction analysis suggests that the balance between reduction and re-oxidation of the glyoxylic acid Cu complex determines the nature of the highly reduced Cu patterns in the ambient air.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Direct Writing of Copper Micropatterns Using Near-Infrared Femtosecond Laser-Pulse-Induced Reduction of Glyoxylic Acid Copper Complex

et al. 2019

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“…Metal oxide NP solutions with NPs of CuO, Cu 2 O, and NiO, a reducing agent, and a dispersant, have been used for laser reductive sintering [ 8 , 9 , 10 , 11 ]. A CuO NP solution composed of CuO NPs, ethylene glycol (EG) as the reductant, and polyvinylpyrrolidone (PVP) as the dispersant, was reduced and sintered using continuous-wave and nanosecond lasers at a wavelength of 1070 nm [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

“…When a laser beam is focused onto the Cu 2 O NP solutions, formic acid is generated by the thermal reaction of 2-propanol and PVP. Then, the formic acid reduces the Cu 2 O to Cu [ 9 ]. Ni micropatterns have also been fabricated by laser reductive sintering of NiO NPs [ 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Heat Accumulation on Femtosecond Laser Reductive Sintering of Mixed CuO/NiO Nanoparticles

2018

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Direct laser-writing techniques have attracted attention for their use in two- and three-dimensional printing technologies. In this article, we report on a micropatterning process that uses femtosecond laser reductive sintering of mixed CuO/NiO nanoparticles. The writing speed, laser fluence, and incident total energy were varied to investigate the influence of heat accumulation on the micropatterns formed by these materials. Heat accumulation and the thermal history of the laser irradiation process significantly affected the material composition and the thermoelectric properties of the fabricated micropatterns. Short laser irradiation durations and high laser fluences decrease the amount of metal oxide in the micropatterns. Selective fabrication of p-type and n-type thermoelectric micropatterns was demonstrated to be possible with control of the reduction and reoxidization reactions through the control of writing speed and total irradiation energy.

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“…Woo et al investigated the reduction effect of various carboxylic acids on CuO NP films. Yang and co‐workers[4a,12] explained the role of PVP and carboxylic acid as a reducing agent for CuO NPs during the laser irradiation process; they also claimed that the solvent of the NP ink is related to the reduction reaction. In order to verify whether the solvent is essential for the reduction reaction in our case, we performed LRS on a completely dried NiO x NP thin film baked at 120 °C for 5 min after spin‐coating, and observed that identical results were achieved at the same laser processing parameters, which confirms that the solvent is not an essential component for reduction.…”

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

109

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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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Effect of solvent and PVP on electrode conductivity in laser-induced reduction process

Cited by 41 publications

References 20 publications

Direct Writing of Copper Micropatterns Using Near-Infrared Femtosecond Laser-Pulse-Induced Reduction of Glyoxylic Acid Copper Complex

Direct Writing of Copper Micropatterns Using Near-Infrared Femtosecond Laser-Pulse-Induced Reduction of Glyoxylic Acid Copper Complex

Effect of Heat Accumulation on Femtosecond Laser Reductive Sintering of Mixed CuO/NiO Nanoparticles

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

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