Uniform droplet printing of graphene micro-rings based on multiple droplets overwriting and coffee-ring effect

Lian, Hongcheng; Qi, Lehua; Luo, Jian; Hu, Kewen

doi:10.1016/j.apsusc.2019.143826

Cited by 15 publications

(5 citation statements)

References 39 publications

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“…Prior to printing, the pristine glass slides were cleaned with ethanol by ultrasonication for 30 min. A home-built DOD printing equipment [52,53] shown in figure 2(a) was utilized in the experiments. The equipment here was composed of a self-developed DOD printhead for graphene droplet generation, a signal generator (Model 9214, Quantum Composers, US) and signal amplifier for pulse voltage generation, a 3D-piezo-nano-stage (M410.DG, PI, Germany) for droplet deposition, a CCD (charge coupled device) camera (MVC-1000SAM-GE30, Microview, China) and LED light source (HFL-100-100-W, CST, China) for image acquisition, as well as a temperature control unit for substrate heating (see figure S1 in supplementary material (available online at stacks.iop.org/2DM/8/035004/mmedia)).…”

Section: Printing and Post-processing Proceduresmentioning

confidence: 99%

Drop-on-demand printing of edge-enhanced and conductive graphene twin-lines by coalescence regulation and multi-layers overwriting

Lian¹,

Qi²,

Luo³

2021

2D Mater.

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Fabrication of straight and highly conductive graphene lines, the cornerstones of high-performance graphene-based printed electronics, still faces considerable challenges. We have developed a convenient and effective way to print edge-enhanced highly conductive graphene twin-lines by coalescence regulation and multi-layers overwriting (CRMO), which enhances both outline accuracy and electrical conductivity. The overlapping traces and wavy edges were eliminated by droplets coalescence at the expense of introducing discrete footprints, which were transformed into continuous lines by multi-layers overwriting. We successfully fabricated the edge-enhanced graphene twin-line with an edge width of 72.33 ± 7.96 μm and a linear resistivity of 0.188 ± 0.160 kΩ μm−1, yielding the coinstantaneous enhancement of outline accuracy, printing efficiency, and electrical conductivity. Printed graphene twin-lines achieve one of the lowest relative linear resistivity reported so far and a conductivity of 359.88 S m−1. We attributed the highly concentrated and tightly interconnected graphene flakes at the edge to the synergetic effect of CRMO. Finally, we have demonstrated the feasibility of CRMO by printing graphene line resistors with excellent linearity and broad resistance ranges. Such findings establish relationships among the printing method, line morphologies, flakes distribution, and electrical conductivity. This work will be of great significance for the self-assembly of graphene-based functional materials and graphene-based printed electronics development.

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Section: Printing and Post-processing Proceduresmentioning

confidence: 99%

Drop-on-demand printing of edge-enhanced and conductive graphene twin-lines by coalescence regulation and multi-layers overwriting

Lian¹,

Qi²,

Luo³

2021

2D Mater.

Self Cite

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“…Droplet arrays have garnered widespread attention in recent years within the fields of materials science, biology, and chemistry by precisely controlling the formation, arrangement, and manipulation of droplets [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ]. The development of droplet array preparation technology has been facilitated by the rapid progress in microfluidic technology and a profound understanding of liquid behavior at the microscale [ 8 , 9 ]. Over the past decade, droplet array preparation has demonstrated substantial potential in fields such as optoelectronic displays [ 10 , 11 ], sensing and detection [ 12 ], and materials synthesis.…”

Section: Introductionmentioning

confidence: 99%

Review of Droplet Printing Technologies for Flexible Electronic Devices: Materials, Control, and Applications

Jiang,

Chen,

Mei

et al. 2024

Micromachines

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Flexible devices have extensive applications in areas including wearable sensors, healthcare, smart packaging, energy, automotive and aerospace sectors, and other related fields. Droplet printing technology can be utilized to print flexible electronic components with micro/nanostructures on various scales, exhibiting good compatibility and wide material applicability for device production. This paper provides a comprehensive review of the current research status of droplet printing technologies and their applications across various domains, aiming to offer a valuable reference for researchers in related areas.

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“…18 During thermal postprocessing, the distribution of graphene may exhibit a "coffee ring" effect. 19,20 The coffee ring effect is a phenomenon that occurs when a droplet of coffee or tea is deposited onto a surface, leaving behind a characteristic stain. The stain exhibits an uneven distribution of color, with the edges appearing darker than the center, resulting in the formation of a ring-like pattern.…”

Section: Introductionmentioning

confidence: 99%

“…Graphene-based flexible composites exhibit outstanding conductivity and thus have a significant potential for flexible wearable applications. – These composites are typically prepared through direct growth via chemical vapor deposition or post-treatment techniques following solution synthesis; these techniques include solution mixing, , in situ polymerization, , and melt mixing. , The reinforcing graphene within a composite forms a random network structure, which has substantial contact resistance between graphene sheets . During thermal postprocessing, the distribution of graphene may exhibit a “coffee ring” effect. , The coffee ring effect is a phenomenon that occurs when a droplet of coffee or tea is deposited onto a surface, leaving behind a characteristic stain. The stain exhibits an uneven distribution of color, with the edges appearing darker than the center, resulting in the formation of a ring-like pattern.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Field-Induced Aligned Graphene/Cellulose Conductive Composites for Electroluminescent Devices

Zhi,

Xu,

et al. 2023

ACS Appl. Nano Mater.

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Graphene is a promising reinforcement for fiber composite materials in flexible wearable applications because of its exceptional conductivity. Researchers have focused on bridging the gap between the intrinsic conductivity of graphene and the macroscopic performance of composite materials. The anisotropy of 2D nanomaterials indicates that their orientation and distribution are crucial factors in determining the macroscopic performance of thin films and bulk materials. Various technologies developed to control the formation of microstructures include electric and magnetic field methods, hot pressing, centrifugation, and freeze-drying. In this study, we prepared flexible graphene/cellulose composite film materials and used magnetic fields to regulate the orientation and distribution of graphene within cellulose paper. Results show that the grid structure of graphene arranged on the composite material produced interconnected conductive paths and reduced the graphene permeation threshold. By giving the conductive layer a higher dielectric constant, we prevented its breakdown as a conductive film. Electroluminescent devices were constructed using graphene/cellulose flexible composite materials and achieved an effective improvement in luminescence performance. Furthermore, directional luminescence was obtained through a microstructure design. This study provides a feasible path for using 2D nanomaterials in high-performance, flexible wearable devices.

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Uniform droplet printing of graphene micro-rings based on multiple droplets overwriting and coffee-ring effect

Cited by 15 publications

References 39 publications

Drop-on-demand printing of edge-enhanced and conductive graphene twin-lines by coalescence regulation and multi-layers overwriting

Drop-on-demand printing of edge-enhanced and conductive graphene twin-lines by coalescence regulation and multi-layers overwriting

Review of Droplet Printing Technologies for Flexible Electronic Devices: Materials, Control, and Applications

Magnetic Field-Induced Aligned Graphene/Cellulose Conductive Composites for Electroluminescent Devices

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