Transparent arrays of silver nanowire rings driven by evaporation of sessile droplets

Kang, Giho; Seong, Baekhoon; Chae, Illkyeong; Yudistira, Hadi Teguh; Lee, Hyungdong; Kim, Hyunggun; Byun, Doyoung

doi:10.1088/1361-6463/aa8c23

Cited by 9 publications

(6 citation statements)

References 38 publications

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“…[13] Self-assembled structures like the coffee-ring structure using evaporation could be applied to various research and industrial areas, such as transparent electrodes [14,15] and printing technologies. Deegan et al reported the coffeering effect that particles assembled by capillary and Marangoni flow inside the drying droplet.…”

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confidence: 99%

Hydrogel Film Assembly Process at Droplet Interface with Evaporation Temperature

Kang

Seong

Gim

et al. 2019

Adv Materials Inter

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and its change of properties by various experimental conditions are essential to explain the assembly process.Nanoparticles assembly process and behaviors inside the drying droplet were highly affected by the role of internal flow. Deegan et al. reported the coffeering effect that particles assembled by capillary and Marangoni flow inside the drying droplet. [13] Self-assembled structures like the coffee-ring structure using evaporation could be applied to various research and industrial areas, such as transparent electrodes [14,15] and printing technologies. [16] To control the particles, it is an important issue that understand and physics of Marangoni flow. Therefore, there were different parametric researches to control the Marangoni flow with controlling temperature, [16,17] droplet size, [18] particle size, [19] and shape. [20] These internal flows did not only make the internal assemblies but also make the interfacial assemblies of particles. Im et al. have reported the self-ordered structure of nanoparticles was made from the strong convective flow. [21] Film assembly at the interface was highly affected by internal flow and its characteristics. However, there were more studies needed to apply to functional materials and polymer films assembly.In this research, we investigated the hydrogel assembly to interface film affect by internal flow change with evaporation temperature using a gelatin solution. Changing the evaporation temperature, the morphology of assembled final hydrogel films after droplet evaporation was measured using a profiler and scanning electron microscopy (SEM). Also, its mechanical properties were measured using nanoindenter. From the increasing internal flow, film assembly was enhanced and morphology changed. And film hardness was increased with faster evaporation. We analyze its change in characteristic and visualization of its nanostructures. Results and Discussion Film Morphology Change with Evaporation TemperatureTo evaluate the hydrogel film assembly changing with evaporation temperature, we observed the final film morphology with the temperature change. Figure 1a shows the final film Recently, thin-film assembly at the liquid-air interface has been widely studied. These film scaffolds have high potential to control the crystallization process and fabricate single crystals. However, there have been limitations in understanding and controlling the behavior of polymer chains form into films. This study investigates thin-film assembly at the hydrogel droplet interface with internal flow and its role. During the hydrogel film formation, the internal flow of the droplet is visualized using micro-particle image velocimetry technique at various temperatures. From the droplet evaporation, convection flow induced by heat cause buoyancy effect and pressure on the interface film from evaporation flux affect the film morphology and its mechanical characteristics. Therefore, more dense assembled film is generated on the droplet interface. It is expected that the investigations could give bette...

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confidence: 99%

Hydrogel Film Assembly Process at Droplet Interface with Evaporation Temperature

Kang

Seong

Gim

et al. 2019

Adv Materials Inter

Self Cite

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“…There is no sign of the coffee-ring effect in the dried pixels. It was shown that large aspect-ratio particles, like Ag-NWs, produce strong capillary interactions that reduce the effect of accumulating particles in the liquid-air contact line [40,41]. These interactions, together with a fast-drying rate lead to a uniform distribution of the Ag-NWs along the whole pixel.…”

Section: Resultsmentioning

confidence: 99%

Transparent and conductive silver nanowires networks printed by laser-induced forward transfer

Sopeña

Serra

Fernández-Pradas

2019

Applied Surface Science

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“…Wang et al have reported that AgNWs are subject to bending and aligning along the liquid-air interface of droplets. [50] Thus, in our printing technique, where the liquid-air interfaces were defined as hydrophilic/hydrophobic interfaces, AgNWs could be bent and aligned along the boundary lines on the edges of hydrophilic areas. However, few AgNWs remained on the hydrophobic areas ( Figure 3c); however, they are unconnected to the AgNW patterns.…”

Section: Discussionmentioning

confidence: 99%

Printable Transparent Microelectrodes toward Mechanically and Visually Imperceptible Electronics

Takemoto

Araki

Uemura

et al. 2020

Advanced Intelligent Systems

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Flexible and transparent electrodes are highly useful in wearable optoelectronic systems for healthcare and biosensing applications for conducting multimodal assessments with electrophysiological and optical measures. In such systems, the electrodes should exhibit a low sheet resistance, high visible transmittance, and small feature size, for reliable electrical sensing, optical observation of attached objects, and integration of devices for mapping local biology events, respectively. Herein, fine-printed, flexible, and transparent microelectrodes that allow biosensing and device integration are reported. The microelectrodes containing cross-aligned silver nanowire (AgNW) networks are patterned via a selective wetting deposition technique on a 1 μm-thick polymer substrate. A low sheet resistance of 25 Ω sq À1 and a visible transmittance of 96%-99% are achieved with a small pattern width of 25 μm. The biosensing application is demonstrated by detecting the leaf electric potential; the leaf cells under the microelectrodes are observed because of visible transparency. Furthermore, device integration is demonstrated by electronic circuits with ultrathin and transparent organic transistors. The transistors exhibit white-light illumination stability and mechanical stability to bending stress. These demonstrations provide a basis for developing ultraimperceptible wearable sensor systems with ultrathinness and high visible transmittance.

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Transparent arrays of silver nanowire rings driven by evaporation of sessile droplets

Cited by 9 publications

References 38 publications

Hydrogel Film Assembly Process at Droplet Interface with Evaporation Temperature

Hydrogel Film Assembly Process at Droplet Interface with Evaporation Temperature

Transparent and conductive silver nanowires networks printed by laser-induced forward transfer

Printable Transparent Microelectrodes toward Mechanically and Visually Imperceptible Electronics

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