Navigation Links
UNIST research team opens graphene band-gap
Date:12/18/2013

(Ulsan, South Korea 18 Dec. 2013): Ulsan National Institute of Science and Technology (UNIST) announced a method for the mass production of boron/nitrogen co-doped graphene nanoplatelets, which led to the fabrication of a graphene-based field -effect transistor (FET) with semiconducting nature. This opens up opportunities for practical use in electronic devices.

The Ulsan National Institute of Science and Technology (UNIST) research team led by Prof. Jong-Beom Baek have discovered an efficient method for the mass production of boron/nitrogen co-doped graphene nanoplatelets (BCN-graphene) via a simple solvothermal reaction of BBr3/CCl4/N2 in the presence of potassium. This work was published in "Angewandte Chemie International Edition" as a VIP ("Very Important Paper".

Since graphene was experimentally discovered in 2004, it has been the focus of vigorous applied research due to its outstanding properties such as high specific surface area, good thermal and electrical conductivities, and many more properties.

However, its Achilles heel is a vanishing band-gap for semiconductor application. As a result, it is not suitable for logic applications, because devices cannot be switched off. Therefore, graphene must be modified to produce a band-gap, if it is to be used in electronic devices.

Various methods of making graphene-based field effect transistors (FETs) have been exploited, including doping graphene, tailoring graphene-like a nanoribbon, and using boron nitride as a support. Among the methods of controlling the band-gap of graphene, doping methods show the most promisinge in terms of industrial scale feasibility.

Although world leading researchers have tried to add boron into graphitic framework to open its band-gap for semiconductor applications, there has not been any notable success yet. Since the atomic size of boron (85 pm) is larger than that of carbon (77 pm), it is difficult to accommodate boron into the graphitic network structure.

A new synthetic protocol developed by a research team from UNIST, a leading Korean university, has revealed that boron/nitrogen co-doping is only feasible when carbon tetrachloride (CCl4 ) is treated with boron tribromide (BBr3 ) and nitrogen (N2) gas.

In order to help boron-doping into graphene structure, the research team used nitrogen (70 pm), which is a bit smaller than carbon and boron. The idea was very simple, but the result was surprising. Pairing two nitrogen atoms and two boron atoms can compensate for the atomic size mismatch. Thus, boron and nitrogen pairs can be easily introduced into the graphitic network. The resultant BCN-graphene generates a band-gap for FETs.

"Although the performance of the FET is not in the ranges of commercial silicon-based semiconductors, this initiative work should be the proof of a new concept and a great leap forward for studying graphene with band-gap opening," said Prof. Jong-Beom Baek.

"I believe this work is one of the biggest advancements in considering the viability of a simple synthetic approach," said Ph.D. candidate Sun-Min Jung, the first author of this article.

Prof. Baek explains the next step: "Now, the remaining challenge is fine-tuning a band-gap to improve the on/off current ratio for real device applications."


'/>"/>

Contact: Hyunho Lee
hhlee@unist.ac.kr
Ulsan National Institute of Science and Technology(UNIST)
Source:Eurekalert  

Related biology news :

1. Predicting antibiotic resistance among goals of UH research
2. Hack the planet? Geoengineering research, ethics, governance explored
3. MU researchers develop advanced 3-dimensional force microscope
4. Researchers explain why some wound infections become chronic
5. Research shows how household dogs protect against asthma and infection
6. Stanford researchers take a step toward developing a universal flu vaccine
7. Researchers engineer a hybrid 5 times more effective in delivering genetic material into cells
8. NIH and NFL tackle concussion research
9. Timing is everything in new nanotechnology for medicine, security and research
10. Young investigators awarded for research excellence at Hong Kong meeting
11. UI researcher studies evolution on the molecular level
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
UNIST research team opens graphene band-gap
(Date:8/27/2019)... ... August 26, 2019 , ... Shoreline Biome , ... strain level, has hired Bill McKenzie as its CEO and Karen Woodward as its ... Shoreline Biome meet growing demand for its products and expand the company’s sales worldwide. ...
(Date:8/27/2019)... ... August 27, 2019 , ... Ambry Genetics ... improve genetic testing guidelines. In the largest cohort study of its kind, Ambry ... at-risk patients. , Clinicians use guidelines to inform decisions about which patients ...
(Date:8/25/2019)... ... 2019 , ... Sierra Instruments is pleased to announce that their redesigned website ... live. Sierra has redesigned entry to the site with both engineers and those new ... to navigate with streamlined menus and simple access to resources and information on products ...
Breaking Biology News(10 mins):
(Date:9/17/2019)... , ... September 17, 2019 , ... Tucker, a Labrador ... only four months old, Tucker was limping and lame on his right hip and ... dysplasia and it was called “the worst case the vet had seen.” He was ...
(Date:9/17/2019)... ... September 16, 2019 , ... ... with the China Focus @ Biotech Week Boston, a forum organized by MyBioGate, ... in healthcare innovation. , After a careful process of evaluation, twelve companies out ...
(Date:9/9/2019)... ... September 09, 2019 , ... Visikol CEO Dr. Michael Johnson ... focused on how best to characterize 3D cell culture models. The inherent problem of ... too thick and opaque to image through and therefore traditional wide-field or even confocal ...
(Date:8/29/2019)... ROCHESTER, N.Y. (PRWEB) , ... August 29, 2019 ... ... within a chronic disease affecting grapevines, a feat they hope will ultimately help ... products. , Researchers including several Rochester Institute of Technology faculty and alumni sequenced ...
Breaking Biology Technology: