Nanotechnology Now

Our NanoNews Digest Sponsors



Heifer International

Wikipedia Affiliate Button


android tablet pc

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

SEMATECH to Showcase Innovation and Advances in Manufacturing at SEMICON Japan 2014: SEMATECH experts will share the latest techniques, emerging trends and best practices in advanced manufacturing strategies and methodologies November 26th, 2014

Australian startup creates world’s first 100% cotton hydrophobic T-Shirts November 26th, 2014

The mysterious 'action at a distance' between liquid containers November 26th, 2014

'Giant' charge density disturbances discovered in nanomaterials: Juelich researchers amplify Friedel oscillations in thin metallic films November 26th, 2014

Research yields material made of single-atom layers that snap together like Legos November 25th, 2014

Physics

The mysterious 'action at a distance' between liquid containers November 26th, 2014

Cooling with the coldest matter in the world November 24th, 2014

Researchers discern the shapes of high-order Brownian motions November 17th, 2014

Graphene

Research yields material made of single-atom layers that snap together like Legos November 25th, 2014

Researchers engineer improvements of technology used in digital memory November 24th, 2014

Graphene/nanotube hybrid benefits flexible solar cells: Rice University labs create novel electrode for dye-sensitized cells November 17th, 2014

Videos/Movies

Purdue 3-D printing innovation capable of making stronger, lighter metal works for auto, aerospace industries November 20th, 2014

New way to move atomically thin semiconductors for use in flexible devices November 13th, 2014

Announcements

SEMATECH to Showcase Innovation and Advances in Manufacturing at SEMICON Japan 2014: SEMATECH experts will share the latest techniques, emerging trends and best practices in advanced manufacturing strategies and methodologies November 26th, 2014

Australian startup creates world’s first 100% cotton hydrophobic T-Shirts November 26th, 2014

The mysterious 'action at a distance' between liquid containers November 26th, 2014

'Giant' charge density disturbances discovered in nanomaterials: Juelich researchers amplify Friedel oscillations in thin metallic films November 26th, 2014

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

The mysterious 'action at a distance' between liquid containers November 26th, 2014

'Giant' charge density disturbances discovered in nanomaterials: Juelich researchers amplify Friedel oscillations in thin metallic films November 26th, 2014

Vegetable oil ingredient key to destroying gastric disease bacteria: In mice, therapeutic nanoparticles dampen H. pylori bacteria and inflammation that lead to ulcers and gastric cancer November 25th, 2014

Research yields material made of single-atom layers that snap together like Legos November 25th, 2014

Water

Iranian Experts Clean Uranium-Contaminated Water by Nano-Particles November 23rd, 2014

Nano Sorbents Able to Remove Pollutions Caused by Oil Derivatives November 20th, 2014

Application of Nanocomposites in Production of Photocatalysts for Water Treatment November 17th, 2014

Newly-Developed Enzyme Catalyst Able to Remove Pollutants from Wastewater November 12th, 2014

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 1999-2014 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE