Nanotechnology Now







Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > Movies of graphene nanopore opening

Figure: Nanopores in graphene, catalyzed by single silicon atoms and recorded by HTEM.

Source: http://www.graphenea.com/blogs/graphene-news/12040077-movies-of-graphene-nanopore-opening#ixzz2tPrSBi3U
Figure: Nanopores in graphene, catalyzed by single silicon atoms and recorded by HTEM. Source: http://www.graphenea.com/blogs/graphene-news/12040077-movies-of-graphene-nanopore-opening#ixzz2tPrSBi3U

Abstract:
Fabricating functional nano-devices is an ultimate goal of nanotechnology. Atomic-scale modification and sculpting of materials can enable nano-machines with wide-varying application potential in biological (medical) and chemical (trace sensing) uses. In our most recent publication, together with Harvard University, the Lawrence Berkeley National Laboratory and FEI corporation, we demonstrate precise modification of graphene at the atomic scale.

Movies of graphene nanopore opening

San Sebastian, Spain | Posted on February 15th, 2014

In our paper "Direct Observation of a Long-Lived Single-Atom Catalyst Chiseling Atomic Structures in Graphene", published in NanoLetters, we report the direct observation of single silicon atoms catalyzing a reaction on a graphene surface. The reaction removes carbon atoms in a controlled fashion, allowing for precise sculpting of nanopores in graphene. Nanopores in graphene hold great technological and scientific potential, and are already being considered for several uses, such as water filtration and DNA sequencing.

Known to humans for centuries, catalysts play an enabling role in many chemical processes that are important to the modern society. Recent advances in nanotechnology introduced nanocatalysts that enable the creation of novel nanostructures, such as carbon nanotubes and semiconductor nanowires. The characteristics of the resulting structures can be tuned by the structures of the corresponding nanocatalysts. For example, in the growth of semiconductor nanowires from metal nanoparticles, the diameter of the resultant nanowire is determined by the size of the catalytic nanoparticles.

Catalysis typically involves complex atomic-scale events that are hard to record, either because they are too fast or too small for the instrumentation used for the recording. We overcome these challenges by using high-resolution transmission electron microscopy (HRTEM) to record individual silicon atoms as they catalyze the graphene chiseling reaction. The products of the chiseling process are atomic-scale features including graphene pores and clean edges.

The silicon atoms are naturally present impurities in the HRTEM chamber. The atoms freely drift along the graphene surface, until they come across an occasional atomic-scale defect in the sheet. The silicon atom then replaces a carbon atom in the chickenwire structure of graphene. A scientist starts the chiseling reaction by directing a focused electron beam to the defect site. The width of the pore starts from only a few angstroms, gradually increasing with the presence of silicon adatoms and under continuous electron irradiation. The pore size is controlled by stopping the irradiation when the desired size has been reached, as seen in the figure above.

These molecular-sized pores are excellent candidates for molecular detection applications, such as rapid DNA sequencing, because they can be tuned to match the size of a single DNA molecule (~10 Angstroms) for the sensitivity that is needed for single base recognition.

Apart from demonstrating the proof of principle, we found some interesting physics of the process, including the dynamics, stability and selectivity of the single-atom chiseling process. Our findings show that there are likely other pairs of atoms in nature, aside from silicon-graphene, that possess atomic chiseling ability.

The graphene used in this research is our standard high-quality CVD graphene, transferred onto a TEM grid.

####

About Graphenea
We are a leading graphene company that manufacture, produce and supply graphene for industrial and research needs. We have developed a synthesis and transfer process to obtain high uniformity monolayer graphene films on any substrate.

For more information, please click here

Contacts:
General Enquiries

Copyright © Graphenea

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 Links

Download paper “Direct Observation of a Long-Lived Single-Atom Catalyst Chiseling Atomic Structures in Graphene”, published in NanoLetters:

Download video:

Related News Press

News and information

Iranian Researchers Planning to Produce Edible Insulin January 28th, 2015

Nanoparticles that deliver oligonucleotide drugs into cells described in Nucleic Acid Therapeutics January 28th, 2015

'Bulletproof' battery: Kevlar membrane for safer, thinner lithium rechargeables January 28th, 2015

Spider electro-combs its sticky nano-filaments January 28th, 2015

JPK opens new expanded offices in Berlin to meet the growing demand for products worldwide January 28th, 2015

Videos/Movies

'Bulletproof' battery: Kevlar membrane for safer, thinner lithium rechargeables January 28th, 2015

Stomach acid-powered micromotors get their first test in a living animal January 27th, 2015

Graphene

Researchers Make Magnetic Graphene: UC Riverside research could lead to new multi-functional electronic devices January 27th, 2015

Fullerex launches 2015 edition of the Bulk Graphene Pricing Report January 26th, 2015

Physics

New pathway to valleytronics January 27th, 2015

Visualizing interacting electrons in a molecule: Scientists at Aalto University and the University of Zurich have succeeded in directly imaging how electrons interact within a single molecule January 26th, 2015

Announcements

Iranian Researchers Planning to Produce Edible Insulin January 28th, 2015

Nanoparticles that deliver oligonucleotide drugs into cells described in Nucleic Acid Therapeutics January 28th, 2015

'Bulletproof' battery: Kevlar membrane for safer, thinner lithium rechargeables January 28th, 2015

Spider electro-combs its sticky nano-filaments January 28th, 2015

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers

Detecting chemical weapons with a color-changing film January 28th, 2015

Joint international research project leads to a breakthrough in terahertz spectroscopy January 28th, 2015

Nanoparticles that deliver oligonucleotide drugs into cells described in Nucleic Acid Therapeutics January 28th, 2015

'Bulletproof' battery: Kevlar membrane for safer, thinner lithium rechargeables January 28th, 2015

Water

Nanoparticles for clean drinking water January 17th, 2015

Going with the flow January 16th, 2015

Rice's Naomi Halas to direct Smalley Institute: Optics pioneer will lead Rice's multidisciplinary science institute January 15th, 2015

Liquids and glasses relax, too. But not like you thought January 15th, 2015

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



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More










ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







© Copyright 1999-2015 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE