Nanotechnology Now

Our NanoNews Digest Sponsors
Heifer International

Wikipedia Affiliate Button

Home > Press > Robust new process forms 3-D shapes from flat sheets of graphene

This study demonstrates graphene integration to a variety of different microstructured geometries, including pyramids, pillars, domes, and inverted pyramids.
CREDIT: Nam Research Group, University of Illinois
This study demonstrates graphene integration to a variety of different microstructured geometries, including pyramids, pillars, domes, and inverted pyramids.

CREDIT: Nam Research Group, University of Illinois

Abstract:
Researchers from the University of Illinois at Urbana-Champaign have developed a new approach for forming 3D shapes from flat, 2D sheets of graphene, paving the way for future integrated systems of graphene-MEMS hybrid devices and flexible electronics.

Robust new process forms 3-D shapes from flat sheets of graphene

Urbana, IL | Posted on June 23rd, 2015

"To the best of our knowledge, this study is the first to demonstrate graphene integration to a variety of different microstructured geometries, including pyramids, pillars, domes, inverted pyramids, and the 3D integration of gold nanoparticles (AuNPs)/graphene hybrid structures," explained SungWoo Nam, an assistant professor of mechanical science and engineering at Illinois. "The flexibility and 3D nature of our structures will enable intimate biosensing devices which can be conformed to the shape and characteristics of human skin and other biological systems. The 3D protruding micro-structures can also achieve enhanced sensitivity by maximizing the effective contact area between the sensors and non-flat surfaces.

"We also expect that our new 3D integration approach will facilitate advanced classes of hybrid devices between microelectromechanical systems (MEMS) and 2D materials for sensing and actuation."

Graphene, a two-dimensional honeycomb lattice of sp2-bonded carbon atoms, has been widely studied due to its high carrier mobility, chemical inertness, and biocompatibility. To date, various reported methods of graphene transfer have been mostly limited to planar or curvilinear surfaces due to the challenges associated with fractures from local stress during transfer onto 3D microstructured surfaces.

"Our method utilizes wet-transfer and adaptive substrate-engineering, providing several key advantages over other fabrication/integration methods of 3D graphene," stated Jonghyun Choi, a graduate student in Nam's research group and first author of the article, "Three-Dimensional Integration of Graphene via Swelling, Shrinking, and Adaptation," appearing in Nano Letters. "Our results demonstrate a simple, versatile, and scalable method to integrate graphene with 3D geometries with various morphologies and dimensions. Not only are these 3D features larger than those reported in previous works, but we also demonstrate the uniformity and damage-free nature of integrated graphene around the 3D features."

The researchers' robust approach to integrate graphene onto 3D microstructured surfaces maintains the structural integrity of graphene, where the out-of-plane dimensions of the 3D features vary from 3.5 to 50 μm. The process incorporates three sequential steps: 1) substrate swelling using a solvent that 2) shrinks during the evaporation process, allowing graphene to 3) adapt, or conform to the shape of a prepared substrate, to achieve damage-free, large area integration of graphene on 3D microstructures.

"Our swelling, shrinking, and adaptation steps are optimized to minimize the degree of graphene suspension around the 3D microstructures and facilitate successful 3D integration," Nam added. "We control the amount of substrate swelling by adjusting the time of immersion in organic solvent and the mixing ratios of monomer and curing agent of the polydimethylsiloxane (PDMS) substrate."

Detailed scanning electron microscopy, atomic force microscopy, Raman spectroscopy, and electrical resistance measurement studies show that the amount of substrate swelling, as well as the flexural rigidities of the transfer film, affect the integration yield and quality of the integrated graphene. To demonstrate the versatility of their approach, the researchers applied the process to a variety of 3D microstructured geometries, as well as integrating hybrid structures of graphene decorated with gold nanoparticles onto 3D microstructure substrates, demonstrating the compatibility of the integration method with other hybrid nanomaterials.

###

In addition to Nam and Choi, the article's co-authors include Hoe Joon Kim, Michael Cai Wang, Juyoung Leem, and William P. King, from the Department of Mechanical Science and Engineering at Illinois.

This work was supported by the Air Force Office of Scientific Research/Asian Office of Aerospace Research Development Nano Bio Info Technology (NBIT) Phase III Program, the American Chemical Society Petroleum Research Fund, the Korean-American Scientists and Engineers Association and the National Science Foundation. Experiments were carried out in part in the Frederick Seitz Materials Research Laboratory and the Micro and Nano Technology Laboratory, and the Beckman Institute Imaging Technology Group at Illinois.

####

For more information, please click here

Contacts:
SungWoo Nam

217-300-0267

Copyright © University of Illinois College of Engineering

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

Nanobiotix Plans to Conduct Registered Public Offering in the United States January 17th, 2019

Power stations driven by light: More efficient solar cells imitate photosynthesis January 16th, 2019

Drilling speed increased by 20% – yet another upgrade in the oil & gas sector made possible by graphene nanotubes January 15th, 2019

Chirality in 'real-time' January 14th, 2019

Media invited to open meeting on the future of quantum technology held at RIT Jan. 23-25: Leaders from NASA, NSF, NIST and Sandia National Laboratory to attend January 11th, 2019

Graphene/ Graphite

Drilling speed increased by 20% – yet another upgrade in the oil & gas sector made possible by graphene nanotubes January 15th, 2019

Boffins manage to keep graphene qubits 'quantum coherent' for all of 55... nanoseconds: Doesn't sound very long, but it could have big implications for quantum computing January 3rd, 2019

Imaging

Chirality in 'real-time' January 14th, 2019

DNA design that anyone can do: Computer program can translate a free-form 2-D drawing into a DNA structure January 4th, 2019

Flexible Electronics

Study unlocks full potential of 'supermaterial' graphene: Researchers remove silicon contamination from graphene to double its performance November 30th, 2018

Researchers quickly harvest 2-D materials, bringing them closer to commercialization: Efficient method for making single-atom-thick, wafer-scale materials opens up opportunities in flexible electronics October 12th, 2018

CTI Materials drives nano commercialization with it's patented surfactant free nanoparticle dispersions August 15th, 2018

Amazingly 'green' synthesis method for high-tech dyes: Dyes that are also of great interest for organic electronics have recently been prepared and crystallised at TU Wien. All that is required is just water, albeit under highly unusual conditions. August 10th, 2018

Govt.-Legislation/Regulation/Funding/Policy

Nanobiotix Plans to Conduct Registered Public Offering in the United States January 17th, 2019

2D materials may enable electric vehicles to get 500 miles on a single charge January 11th, 2019

Spintronics 'miracle material' put to the test: Physicists build devices using mineral perovskite January 11th, 2019

Cartilage could be key to safe 'structural batteries' January 11th, 2019

MEMS

Mirrorcle laser-cuts ribbon on cleanroom facility for volume MEMS mirror production November 26th, 2018

Bosch provides customized IoT and Industry 4.0 solutions: Bosch Mondeville and Bosch Connected Devices and Solutions collaborate to meet a wide variety of customer requirements November 16th, 2018

Mode-Changing MEMS Accelerometer from STMicroelectronics Combines High Measurement Resolution and Ultra-Low Power for Industrial Applications November 7th, 2018

UCI scientists push microscopy to sub-molecular resolution: Carbon monoxide used to measure electric forces in single chemical compound October 2nd, 2018

Sensors

Ultra-sensitive sensor with gold nanoparticle array January 9th, 2019

Study on low noise, high-performance transistors may bring innovations in electronics December 28th, 2018

Emerging trends in advanced nano-materials based electrochemical geno-sensors December 28th, 2018

Oxford Instruments participates in the launch of the European Quantum Technology Flagship Programme ‘QMiCS’ December 13th, 2018

Discoveries

Power stations driven by light: More efficient solar cells imitate photosynthesis January 16th, 2019

Chirality in 'real-time' January 14th, 2019

Spintronics 'miracle material' put to the test: Physicists build devices using mineral perovskite January 11th, 2019

Cartilage could be key to safe 'structural batteries' January 11th, 2019

Materials/Metamaterials

Drilling speed increased by 20% – yet another upgrade in the oil & gas sector made possible by graphene nanotubes January 15th, 2019

2D materials may enable electric vehicles to get 500 miles on a single charge January 11th, 2019

New materials could help improve the performance of perovskite solar cells January 11th, 2019

Spintronics 'miracle material' put to the test: Physicists build devices using mineral perovskite January 11th, 2019

Announcements

Nanobiotix Plans to Conduct Registered Public Offering in the United States January 17th, 2019

Power stations driven by light: More efficient solar cells imitate photosynthesis January 16th, 2019

Drilling speed increased by 20% – yet another upgrade in the oil & gas sector made possible by graphene nanotubes January 15th, 2019

Chirality in 'real-time' January 14th, 2019

Tools

Drilling speed increased by 20% – yet another upgrade in the oil & gas sector made possible by graphene nanotubes January 15th, 2019

Chirality in 'real-time' January 14th, 2019

DNA design that anyone can do: Computer program can translate a free-form 2-D drawing into a DNA structure January 4th, 2019

Using sound to independently levitate a range of objects is achieved for the first time December 28th, 2018

Grants/Sponsored Research/Awards/Scholarships/Gifts/Contests/Honors/Records

Scientists program proteins to pair exactly: Technique paves the way for the creation of protein nanomachines and for the engineering of new cell functions December 21st, 2018

Strem Chemicals, Inc., Receives National Performance Improvement Honor: Company Recognized for Stakeholder Communications December 20th, 2018

Superfluidity: what is it and why does it matter? December 20th, 2018

Arrowhead Pharmaceuticals Reports Inducement Grants under NASDAQ Marketplace Rule 5635(c)(4) December 18th, 2018

NanoNews-Digest
The latest news from around the world, FREE



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project