Surface ablation thresholds of femtosecond laser micropatterning silver nanowires network on flexible substrate

Liang, Chang; Sun, Xiaoyan; Zheng, Jianfen; Su, Wenming; Hu, Youwang; Duan, Ji’an

doi:10.1016/j.mee.2020.111396

Cited by 13 publications

(16 citation statements)

References 30 publications

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“…The yellow curve in Figure k was the corresponding laser energy distribution according to different areas. The clear boundary in Figure l showed that the Ag NWs could be removed or welded by laser. − From Figure m, it was seen in the A area the junctions were ∼67%, while in the B area they were ∼10%. The ablation threshold energy for PET or Ag NWs was 1.50 or 0.55 J/cm 2 , respectively, and the Ag NWs were welded with the laser intensity of 0.06–0.55 J/cm 2 .…”

Section: Printing Technologymentioning

confidence: 99%

“…The direct writing method differs from conventional inkjet printing, which can fabricate the Ag mesh/grid by jetting a concentrated ink directly or curing the coated Ag solution by the laser directly. ,,,− The method improves the resolution and benefits the applications in microelectronics with many virtues such as precise patterning, flexibility, and adaptability. For jetting ink with a high concentration, Ahn et al directly wrote Ag grids by extruding a concentrated Ag ink as shown in Figure a .…”

Section: Printing Technologymentioning

confidence: 99%

“…With the increase of the concentration of Ag ink, the edges of the Ag lines became wavy (Figure g–i). Liang et al found the surface ablation thresholds by micropatterning Ag NWs networks with a femtosecond laser as shown in Figure j . The laser-ablating area was divided into PET ablation, Ag NWs removal (I), and Ag NWs welded (II) areas (Figure k).…”

Section: Printing Technologymentioning

confidence: 99%

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Fabrication of Silver Mesh/Grid and Its Applications in Electronics

Zhou

Song

2021

ACS Appl. Mater. Interfaces

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With the development of flexible electronics, researchers have endeavored to improve the characteristics of the commonly used indium tin oxide such as brittleness, poor mechanical or chemical stability, and scarcity. Currently, many alternative materials have been considered such as conductive polymers, graphene, carbon nanotubes, metallic nanoparticles (NPs), nanowires (NWs), or nanofibers. Among them, silver (Ag) mesh/grid NPs or NWs have been considered as an excellent substitute due to the good transmittance, excellent electrical conductivity, outstanding mechanical robustness, and cost competitiveness. So far, much effort has been devoted to the fabrication of Ag mesh/grid, and many methods such as printing technology, self-assembly, electrospun, hot-pressing, and atomic layer deposition have been reported. Here printing technologies include jet printing, gravure printing, screen printing, nanoimprint lithography, microcontact printing, and flexographic printing. The solution-based self-assembly usually combines with coating, template, or mask assistance. This review summarizes the characteristics of these fabrication methods for the Ag mesh/grid with its related applications in electronics. Then the prospect and challenges of the fabrication methods are discussed, and the new preparation approaches and applications of the Ag mesh/grid are highlighted, which will be of significance for the applications in electronics such as transparent conducting electrodes, organic light-emitting diode, energy harvester, strain sensor, cells, etc.

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Section: Printing Technologymentioning

confidence: 99%

Section: Printing Technologymentioning

confidence: 99%

Section: Printing Technologymentioning

confidence: 99%

See 1 more Smart Citation

Fabrication of Silver Mesh/Grid and Its Applications in Electronics

Zhou

Song

2021

ACS Appl. Mater. Interfaces

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“…ture will significantly promote the device performance for excellent electrical con duction or isolation. [12,13] The recently reported methods for patterning AgNWs include photolitho graphy, [14,15] laser ablation, [16][17][18] inkjet prin ting, [19][20][21][22][23] printing, [24][25][26][27] mask assis ting, [28][29][30] stamping transfer, [31,32] micro channel selfassembly, [33,34] and substrate surface treatment. [35][36][37] The minimum patterning widths of these methods for AgNWs electrode are summarized in Table S1, Supporting Information.…”

mentioning

confidence: 99%

“…However, this technology involves multiple processing steps and the use of expensive equipment. Laser abla tion [18] is likely to damage heatsensitive plastic substrates or fuse AgNWs, because of the high temperature generated during laser processing. Inkjet printing [19][20][21][22][23] is a facile onestep, maskfree patterning techniques, but its min imum patterning accuracy will be limited by the nozzle size.…”

mentioning

confidence: 99%

Femtosecond Laser Patterning Wettability‐Assisted PDMS for Fabrication of Flexible Silver Nanowires Electrodes

Liang

Sun

et al. 2021

Adv Materials Inter

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In this paper, a facile method is demonstrated to fabricate high resolution silver nanowires (AgNWs) electrode by combining femtosecond laser patterning and oxygen plasma treatment. The laser precision cutting selectively removes the thin polydimethylsiloxane (PDMS) mask to expose the target PDMS substrate. The subsequent oxygen plasma treatment makes the target substrate hydrophilic. The resulting wetting/dewetting pattern allows for selective trapping of AgNWs solutions into the hydrophilic regions. The geometry of AgNWs electrode can be readily tuned by varying the cutting path of laser patterning mask. Improving the cutting accuracy of mask by adjusting laser processing parameters, the minimum width of the AgNWs electrode can be reduced to 50 µm. The prepared AgNWs electrodes show good conductivity even after tensile strain less than 20% or 5000 bending cycles at 4 mm bending radius. Furthermore, using the patterned AgNWs electrodes, flexible electroluminescent displays are constructed, which exhibit bright and uniform emission with clear edges; even the track width is only 50 µm. This method provides a novel approach to pattern complex electrode for the application of flexible electronic products.

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Fast Welding of Silver Nanowires for Flexible Transparent Conductive Film by Spatial Light Modulated Femtosecond Laser

Liang

Sun

et al. 2021

Adv Eng Mater

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Silver nanowires (AgNWs) conductors with fine flexibility and high conductivity have been considered to have a promising perspective in the area of flexible transparent electrode. However, many challenges still exist in improving the conductivity of AgNWs films, such as high temperature and time‐consuming. Herein, an efficient and rapid method to weld AgNWs by spatial light modulated femtosecond (fs) laser is proposed. The Gaussian laser beam is modulated into a line‐shaped laser beam with the length of 773 μm. Compared with traditional spherical lens focus irradiation welding, the welding efficiency can be improved up to tens of times. The mechanism of fs laser welding is mainly to use high‐energy laser beam irradiation to generate local field enhancement which causes local high temperature at the nanowire junction. After laser welding, the sheet resistance of AgNWs films can be reduced to 14.7 Ω sq−1 at the transmittance of 89.5% without substrate damage. The welded AgNWs films exhibit excellent electrical conductivity even after 10 000 bending cycles. Moreover, the welded AgNWs films are used to make a flexible transparent heater, showing superior sheet resistance uniformity.

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Surface ablation thresholds of femtosecond laser micropatterning silver nanowires network on flexible substrate

Cited by 13 publications

References 30 publications

Fabrication of Silver Mesh/Grid and Its Applications in Electronics

Fabrication of Silver Mesh/Grid and Its Applications in Electronics

Femtosecond Laser Patterning Wettability‐Assisted PDMS for Fabrication of Flexible Silver Nanowires Electrodes

Fast Welding of Silver Nanowires for Flexible Transparent Conductive Film by Spatial Light Modulated Femtosecond Laser

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