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

NanoSafe, Inc. announces the addition of the Labconco Protector® Glove Box to its NanoSafe Tested™ registry April 23rd, 2014

Study finds long-term survival of human neural stem cells transplanted into primate brain April 23rd, 2014

High-Performance, Low-Cost Ultracapacitors Built with Graphene and Carbon Nanotubes: Future devices based on technology could bridge gap between batteries and conventional capacitors in portable electronics and hybrid electric vehicles April 23rd, 2014

Guo Lab Shows Potential of RNA as Heat-resistant Polymer Material for Nanoarchitectures April 23rd, 2014

Berkeley Lab Researchers Demonstrate First Size-based Chromatography Technique for the Study of Living Cells April 22nd, 2014

Graphene

High-Performance, Low-Cost Ultracapacitors Built with Graphene and Carbon Nanotubes: Future devices based on technology could bridge gap between batteries and conventional capacitors in portable electronics and hybrid electric vehicles April 23rd, 2014

Nanomaterial Outsmarts Ions April 22nd, 2014

Thinnest feasible membrane produced April 17th, 2014

Videos/Movies

Like a hall of mirrors, nanostructures trap photons inside ultrathin solar cells April 22nd, 2014

Physics

A new key to unlocking the mysteries of physics? Quantum turbulence April 21st, 2014

Thinnest feasible membrane produced April 17th, 2014

Scientists Capture Ultrafast Snapshots of Light-Driven Superconductivity: X-rays reveal how rapidly vanishing 'charge stripes' may be behind laser-induced high-temperature superconductivity April 16th, 2014

Announcements

NanoSafe, Inc. announces the addition of the Labconco Protector® Glove Box to its NanoSafe Tested™ registry April 23rd, 2014

Study finds long-term survival of human neural stem cells transplanted into primate brain April 23rd, 2014

High-Performance, Low-Cost Ultracapacitors Built with Graphene and Carbon Nanotubes: Future devices based on technology could bridge gap between batteries and conventional capacitors in portable electronics and hybrid electric vehicles April 23rd, 2014

Guo Lab Shows Potential of RNA as Heat-resistant Polymer Material for Nanoarchitectures April 23rd, 2014

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

Study finds long-term survival of human neural stem cells transplanted into primate brain April 23rd, 2014

High-Performance, Low-Cost Ultracapacitors Built with Graphene and Carbon Nanotubes: Future devices based on technology could bridge gap between batteries and conventional capacitors in portable electronics and hybrid electric vehicles April 23rd, 2014

Guo Lab Shows Potential of RNA as Heat-resistant Polymer Material for Nanoarchitectures April 23rd, 2014

Berkeley Lab Researchers Demonstrate First Size-based Chromatography Technique for the Study of Living Cells April 22nd, 2014

Water

Thinnest feasible membrane produced April 17th, 2014

Trees go high-tech: process turns cellulose into energy storage devices April 7th, 2014

Dais Analytic Wins SBIR Grant: Dais Analytic Receives US Army Small Business Innovation Research Grant to Further Its Demonstrated Successes in Cleaning Most Forms of Wastewater March 28th, 2014

University of Waterloo Engineering to Showcase Student Design March 14th, 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