Navigation Links
Graphene films clear major fabrication hurdle
Date:4/8/2010

final product was a single-layer graphene film on a bare dielectric.

"This is exciting news for electronic applications because chemical vapor deposition is a technique already widely used in the semiconductor industry," Zhang says. "Also, we can learn more about the growth of graphene on metal catalyst surfaces by observing the evolution of the films after the evaporation of the copper. This should lay an important foundation for further control of the process and enable us to tailor the properties of these films or produce desired morphologies, such as graphene nanoribbons."

Zhang and his colleagues have reported their findings in the journal Nano Letters in a paper titled, "Direct Chemical Vapor Deposition of Graphene on Dielectric Surfaces." Other co-authors of this paper were Ariel Ismach, Clara Druzgalski, Samuel Penwell, Maxwell Zheng, Ali Javey and Jeffrey Bokor, all with Berkeley Lab.

In their study, Zhang and his colleagues used electron-beam evaporation to deposit copper films ranging in thickness from 100 to 450 nanometers. Copper was chosen because as a low carbon solubility metal catalyst it was expected to allow better control over the number of graphene layers produced. Several different dielectric substrates were evaluated including single-crystal quartz, sapphire, fused silica and silicon oxide wafers. CVD of the graphene was carried out at 1,000 degrees Celsius in durations that ranged from 15 minutes up to seven hours.

"This was done to allow us to study the effect of film thickness, substrate type and CVD growth time on the graphene formation," Zhang says.

A combination of scanning Raman mapping and spectroscopy, plus scanning electron and atomic force microscopy confirmed the presence of continuous single-layer graphene films coating metal-free areas of dielectric substrate measuring tens of square micrometers.

"Further improvement on the control of the dewetting and evaporatio
'/>"/>

Contact: Lynn Yarris
lcyarris@lbl.gov
510-486-5375
DOE/Lawrence Berkeley National Laboratory
Source:Eurekalert  

Page: 1 2 3

Related biology technology :

1. UM physicists show electrons can travel over 100 times faster in graphene than in silicon
2. Graphene gazing gives glimpse of foundations of universe
3. Graphene used to create worlds smallest transistor
4. Graphene-based gadgets may be just years away
5. By adding graphene, researchers create superior polymer
6. Penn scientists demonstrate potential of graphene films as next-generation transistors
7. Graphene pioneers follow in Nobel footsteps
8. New graphene-based material clarifies graphite oxide chemistry
9. Researchers discover method for mass production of nanomaterial graphene
10. Light-speed nanotech: Controlling the nature of graphene
11. Scientists prove graphenes edge structure affects electronic properties
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Graphene films clear major fabrication hurdle
(Date:1/22/2015)... | RBJ today announces the firm brokered a long-term lease ... leading biopharmaceutical company, at Two Ledgemont Center in ... , president, and Brian Cohen , senior vice president, ... at 95 Hayden Ave. Photo - http://photos.prnewswire.com/prnh/20150122/170765 ...
(Date:1/22/2015)... BOSTON , Jan. 22, 2015  Transwestern | RBJ today ... feet of office space for Shire a leading biopharmaceutical company, ... . Transwestern | RBJ,s Robert Richards , president, and ... the lease for the entire five-floor building at 95 Hayden ...
(Date:1/22/2015)... January 22, 2015 The laboratory information ... has witnessed a number of technological advancements due to ... requirements, growing need to integrate healthcare systems, and increasing ... challenges in system integration. Key players in the market ...
(Date:1/22/2015)... OH (PRWEB) January 22, 2015 Crystal Diagnostics ... today that it has received AOAC-PTM Certifications for the six ... O121, and O145; collectively referred to as STEC or the ... 1 colony forming unit (cfu) per 325 g of raw ...
Breaking Biology Technology:Transwestern | RBJ Advises Shire in 202,000 SF Lease, Creating Boston's Largest Suburban Biotech Campus 2Transwestern?RBJ Advises Shire in 202,000 SF Lease, Creating Boston's Largest Suburban Biotech Campus 2Laboratory Information Management Systems Market is Expected to Reach $1,323.6 Million by 2019 - New Research Report by MarketsandMarkets 2Laboratory Information Management Systems Market is Expected to Reach $1,323.6 Million by 2019 - New Research Report by MarketsandMarkets 3Laboratory Information Management Systems Market is Expected to Reach $1,323.6 Million by 2019 - New Research Report by MarketsandMarkets 4Crystal Diagnostics Awarded AOAC-PTM Accreditation for the Rapid Detection of “Big 6” E.coli Food Pathogens 2
... to Screen Donated Blood for Hepatitis B, as well ... and Semi-Automated Instrument Systems -, SAN DIEGO, Aug. ... that the US Food and Drug Administration,(FDA) has approved ... to screen donated blood for the hepatitis B,virus (HBV). ...
... Stock Exchange Symbol: MS, - Milestone triggers ... - EDMONTON, Aug. 13 /PRNewswire-FirstCall/ - BioMS ... treatment of multiple sclerosis (MS), today,announced that the ... trial has conducted the scheduled interim analysis of ...
... Mentice, Inc. and MATC have,forged a relationship that ... multiple,and mutually beneficial projects to further advance the ... throughout North America., Mentice,s Procedicus VIST Simulator ... physician to gain exposure to routine,and sophisticated procedures. ...
Cached Biology Technology:FDA Grants Full Approval of PROCLEIX(R) ULTRIO(R) Blood Screening Assay 2FDA Grants Full Approval of PROCLEIX(R) ULTRIO(R) Blood Screening Assay 3FDA Grants Full Approval of PROCLEIX(R) ULTRIO(R) Blood Screening Assay 4BioMS Medical announces positive interim analysis on phase III trial of dirucotide (MBP8298) for multiple sclerosis 2BioMS Medical announces positive interim analysis on phase III trial of dirucotide (MBP8298) for multiple sclerosis 3BioMS Medical announces positive interim analysis on phase III trial of dirucotide (MBP8298) for multiple sclerosis 4Mentice, Inc. and the Milwaukee Area Technical College (MATC) Announce Their Partnership in the Area of Procedural Medical Simulation 2
(Date:1/22/2015)... Jan. 21, 2015  Analyst Report Issued by Small Cap IR. ... showed that planet-wide, transactions at merchants on the leading payment ... number of credit, debit, and prepaid cards reached 6.54 billion.  ... of fraudulent card usage in 2012, and credit and debit ...
(Date:12/24/2014)... NEW YORK , Dec. 23, 2014  Since its launch in ... of people to eliminate the pain of trying to remember ... their own biometrics fused to their smartphones. To assist people ... Labs , the company that created 1U and focuses on ...
(Date:12/19/2014)... ( http://www.researchandmarkets.com/research/86ncd6/micro_market ) has announced the addition of ... Market" report to their offering. ... market is estimated to grow at a CAGR of 3.6% ... larger share in this market, Canada ...
Breaking Biology News(10 mins):$4.80 Near Term Price Target with "Buy" given by CapRock Research for NXT-ID, Inc. (NASDAQ: NXTD) issued by Small Cap IR 21U Offers Best Solution to the Username / Password Dilemma: For FREE! 21U Offers Best Solution to the Username / Password Dilemma: For FREE! 3Micro Market Monitor: North America Perimeter Security Systems Market (Intrusion Detection Sensor, Video Surveillance, Communication/Alarm and Notification, Access Control System) 2Micro Market Monitor: North America Perimeter Security Systems Market (Intrusion Detection Sensor, Video Surveillance, Communication/Alarm and Notification, Access Control System) 3
... you are obese and hope to be a father, ... grandchildren may inherit your waistline or metabolic disorders. That,s ... even those who did not show any signs of ... their daughters. Sons don,t entirely dodge this genetic ...
... Trust today launches a global funding scheme to seed research ... of human health. With the ever-rising global ... scheme responds to the pressing challenge of ensuring that everyone ... ecological and societal needs in a sustainable and economically viable ...
... established HPV types. Cancerous human papillomavirus (HPV) viruses are the ... to 100% of cervical tumors. Cervical cancer and ... virus using standard techniques can sometimes give a negative result ... In a new study published in Virology , ...
Cached Biology News:Obese dads pass on predisposition to obesity and metabolic disorders to their kids 2Fund launched to seed new thinking in sustaining the future of health 2Fund launched to seed new thinking in sustaining the future of health 3
Rat Epidermal Keratinocytes (REK) (>500,000 cells)...
Porcine Coronary Artery Endothelial Cells (PCAEC) (>500,000 cells)...
...
Porcine Aortic Smooth Muscle Cells (PAOSMC) (>500,000 cells)...
Biology Products: