Navigation Links
New method of growing high-quality graphene promising for next-gen technology
Date:10/17/2011

(UC Santa Barbara) Making waves as the material that will revolutionize electronics, graphene composed of a single layer of Carbon atoms has nonetheless been challenging to produce in a way that will be practical for innovative electronics applications. Researchers at UC Santa Barbara have discovered a method to synthesize high quality graphene in a controlled manner that may pave the way for next-generation electronics application.

Kaustav Banerjee, a professor with the Electrical and Computer Engineering department and Director of the Nanoelectronics Research Lab at UCSB that has been studying carbon nanomaterials for more than seven years, led the research team to perfect methods of growing sheets of graphene, as detailed in a study to be published in the November 2011 issue of the journal Carbon.

"Our process has certain unique advantages that give rise to high quality graphene," says Banerjee. "For the electronics industry to effectively use graphene, it must first be grown selectively and in larger sheets. We have developed a synthesis technique that yields high- quality and high-uniformity graphene that can be translated into a scalable process for industry applications."

Using adhesive tape to lift flakes of graphene from graphite, University of Manchester researchers Geim and Novoselov were awarded the 2010 Nobel Prize in Physics for their pioneering isolation and characterization of the material. To launch graphene into futuristic applications, however, researchers have been seeking a controlled and efficient way to grow a higher quality of this single-atom-thick material in larger areas.

The discovery by UCSB researchers turns graphene production into an industry-friendly process by improving the quality and uniformity of graphene using efficient and reproducible methods. They were able to control the number of graphene layers produced from mono-layer to bi-layer graphene an important distinction for future applications in electronics and other technology.

"Intel has a keen interest in graphene due to many possibilities it holds for the next generation of energy- efficient computing, but there are many roadblocks along the way," added Intel Fellow, Shekhar Borkar. "The scalable synthesis technique developed by Professor Banerjee's group at UCSB is an important step forward."

As a material, graphene is the thinnest and strongest in the world more than 100 times stronger than diamond and is capable of acting as an ultimate conductor at room temperature. If it can be produced effectively, graphene's properties make it ideal for advancements in green electronics, super strong materials, and medical technology. Graphene could be used to make flexible screens and electronic devices, computers with 1,000 GHz processors that run on virtually no energy, and ultra-efficient solar power cells.

Key to the UCSB team's discovery is their understanding of graphene growth kinetics under the influence of the substrate. Their approach uses a method called low pressure chemical vapor deposition (LPCVD) and involves disintegrating the hydrocarbon gas methane at a specific high temperature to build uniform layers of carbon (as graphene) on a pretreated copper substrate. Banerjee's research group established a set of techniques that optimized the uniformity and quality of graphene, while controlling the number of graphene layers they grew on their substrate.

According to Dr. Wei Liu, a post-doctoral researcher and co-author of the study, "Graphene growth is strongly affected by imperfection sites on the copper substrate. By proper treatment of the copper surface and precise selection of the growth parameters, the quality and uniformity of graphene are significantly improved and the number of graphene layers can be controlled."

Professor Banerjee and credited authors Wei Liu, Hong Li, Chuan Xu and Yasin Khatami are not the first research team to make graphene using the CVD method, but they are the first to successfully refine critical methods to grow a high quality of graphene. In the past, a key challenge for the CVD method has been that it yields a lower quality of graphene in terms of carrier mobility or how well it conducts electrons. "Our graphene exhibits the highest reported field-effect mobility to date for CVD graphene, having an average value of 4000 cm2/V.s with the highest peak value at 5500 cm2/V.s. This is an extremely high value compared with the mobility of silicon." added Hong Li, a Ph.D. candidate in Banerjee's research group.

"Kaustav Banerjee's group is leading graphene nanoelectronics research efforts at UCSB, from material synthesis to device design and circuit exploration. His work has provided our campus with unique and very powerful capabilities," added David Awschalom, Professor of Physics, Electrical and Computer Engineering, and Director of the California NanoSystems Institute (CNSI) at UCSB where Banerjee's laboratory is located. "This new facility has also boosted our opportunities for collaborations across various science and engineering disciplines."

"There is no doubt graphene is a superior material. Intrinsically it is amazing," says Banerjee. "It is up to us, the scientists and engineers, to show how we can use graphene and harness its capabilities. There are challenges in how to grow it, how to transfer or not to transfer and pattern it, and how to tailor its properties for specific applications. But these challenges are fertile grounds for exciting research in the future."


'/>"/>

Contact: Melissa Van De Werfhorst
melissa@engineering.ucsb.edu
805-893-4301
University of California - Santa Barbara
Source:Eurekalert  

Related biology news :

1. Commercial aquatic plants offer cost-effective method for treating wastewater
2. UC Riverside biochemists devise method for bypassing aluminum toxicity effects in plants
3. New lab manual focuses on essential methods for purifying and characterizing proteins
4. Deep biosphere research points to new methods for recovering petroleum
5. Fingerprinting method tracks mercury emissions from coal
6. Iowa State researcher develops new treatment method for canine eye diseases
7. New method provides panoramic view of protein-RNA interactions in living cells
8. Cold Spring Harbor Protocols features organ and cell culture methods
9. Engineer to present leak-proof method for carbon dioxide storage at international conference
10. Pitt researchers use fluorescence to develop method for detecting mercury in fish
11. New holographic method could be used for lab-on-a-chip technologies
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
New method of growing high-quality graphene promising for next-gen technology
(Date:4/28/2016)... and BANGALORE, India , April 28, ... Systems, a product subsidiary of Infosys (NYSE: INFY ... announced a global partnership that will provide end ... use mobile banking and payment services.      (Logo: ... key innovation area for financial services, but it also plays ...
(Date:4/15/2016)... 2016  A new partnership announced today will ... decisions in a fraction of the time it ... high-value life insurance policies to consumers without requiring ... Force Diagnostics, rapid testing (A1C, Cotinine and HIV) ... pressure, weight, pulse, BMI, and activity data) available ...
(Date:3/31/2016)... , March 31, 2016  Genomics firm Nabsys has ... CEO, Barrett Bready , M.D., who returned to ... the original technical leadership team, including Chief Technology Officer, ... Product Development, Steve Nurnberg and Vice President of Software ... the company. Dr. Bready served as CEO ...
Breaking Biology News(10 mins):
(Date:5/22/2016)... Raleigh, NC (PRWEB) , ... May 22, 2016 , ... ... powerful weapons in combating the asbestos cancer, malignant mesothelioma. Surviving Mesothelioma has just posted ... , Researchers in the University of Rome’s Department of Clinical Sciences and Translational Medicine ...
(Date:5/20/2016)... Baltimore, MD (PRWEB) , ... May 20, 2016 , ... ... contaminated with Listeria, as reported by Food Safety News on May 12, 2016(1), demonstrates ... according to Ted Olsen, CEO of Baltimore-based biotech firm, PathSensors, Inc. ...
(Date:5/19/2016)... (PRWEB) , ... May 19, 2016 , ... ... research organization (CRO) has welcomed Abu Siddiqui as Director, Large Molecule & Biomarker ... executing biologics, vaccine and translational biomarker discovery studies for preclinical and clinical safety ...
(Date:5/18/2016)... (PRWEB) , ... May 18, 2016 , ... ... Pharmaceutical Sciences Summer Camp at The University of Toledo. This two-day camp will ... an opportunity to explore the field of pharmaceutical sciences in preparation for a ...
Breaking Biology Technology: