MechSE Researchers Create One-step Graphene Patterning MethodApril 28, 2016 | University of Illinois
Estimated reading time: 2 minutes
Researchers from the University of Illinois at Urbana-Champaign have developed a one-step, facile method to pattern graphene by using stencil mask and oxygen plasma reactive-ion etching, and subsequent polymer-free direct transfer to flexible substrates.
Graphene, a two-dimensional carbon allotrope, has received immense scientific and technological interest. Combining exceptional mechanical properties, superior carrier mobility, high thermal conductivity, hydrophobicity, and potentially low manufacturing cost, graphene provides a superior base material for next generation bioelectrical, electromechanical, optoelectronic, and thermal management applications.“Significant progress has been made in the direct synthesis of large-area, uniform, high quality graphene films using chemical vapor deposition (CVD) with various precursors and catalyst substrates,” explained SungWoo Nam, an assistant professor of mechanical science and engineeringat Illinois. “However, to date, the infrastructure requirements on post-synthesis processing—patterning and transfer—for creating interconnects, transistor channels, or device terminals have slowed the implementation of graphene in a wider range of applications.”
“In conjunction with the recent evolution of additive and subtractive manufacturing techniques such as 3D printing and computer numerical control milling, we developed a simple and scalable graphene patterning technique using a stencil mask fabricated via a laser cutter,” stated Keong Yong, a graduate student and first author of the paper, “Rapid Stencil Mask Fabrication Enabled One-Step Polymer-Free Graphene Patterning and Direct Transfer for Flexible Graphene Devices" appearing in Scientific Reports.“Our approach to patterning graphene is based on a shadow mask technique that has been employed for contact metal deposition,” Yong added. “Not only are these stencil masks easily and rapidly manufactured for iterative rapid prototyping, they are also reusable, enabling cost-effective pattern replication. And since our approach involves neither a polymeric transfer layer nor organic solvents, we are able to obtain contamination-free graphene patterns directly on various flexible substrates.”
Nam stated that this approach demonstrates a new possibility to overcome limitations imposed by existing post-synthesis processes to achieve graphene micro-patterning. Yong envisions this facile approach to graphene patterning sets forth transformative changes in “do It yourself” (DIY) graphene-based device development for broad applications including flexible circuits/devices and wearable electronics.
“This method allows rapid design iterations and pattern replications, and the polymer-free patterning technique promotes graphene of cleaner quality than other fabrication techniques,” Nam said. “We have shown that graphene can be patterned into varying geometrical shapes and sizes, and we have explored various substrates for the direct transfer of the patterned graphene.”
In addition to Nam and Yong, study co-authors include Ali Ashraf and Pilgyu Kang from the Department of Mechanical Science and Engineering at Illinois.
HyPerStripes project partners will create a technology platform including manufacturing techniques for roll-to-roll (R2R) processing as well as the integration of electronic components onto very long ("endless"), flexible and stretchable printed circuit boards.
All Flex Solutions announced its acquisition of the building located at 1200 West 96th Street in Minneapolis; the purchase and buildout of this property will expand the company’s manufacturing capacity and capabilities.
DELO has developed a flexible electronics adhesive that permanently seals sensor housings airtight and thus reliably protects components such as image sensors.
Insulectro continues its drive to educate PCB designers about the ins and outs of advanced flex materials. On Sept. 19 the company hosted an all-day seminar on flexible and printed electronic materials at its San Jose, Calif., facility.
The latest “Automotive Display Market Analysis” from TrendForce indicates that the overall demand for automotive display panels (automotive panels) is gradually stabilizing and shows an upward trend as the automotive market as a whole slowly recovers, and promotional activities related to smart cockpits continue to expand.