Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

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

Construction of practical quantum computers radically simplified: Scientists invent ground-breaking new method that puts quantum computers within reach December 5th, 2016

Shape matters when light meets atom: Mapping the interaction of a single atom with a single photon may inform design of quantum devices December 4th, 2016

UTSA study describes new minimally invasive device to treat cancer and other illnesses: Medicine diffusion capsule could locally treat multiple ailments and diseases over several weeks December 3rd, 2016

Novel Electrode Structure Provides New Promise for Lithium-Sulfur Batteries December 3rd, 2016

Physics

Shape matters when light meets atom: Mapping the interaction of a single atom with a single photon may inform design of quantum devices December 4th, 2016

Deep insights from surface reactions: Researchers use Stampede supercomputer to study new chemical sensing methods, desalination and bacterial energy production December 2nd, 2016

An Archimedes' screw for groups of quantum particles November 19th, 2016

Trickling electrons: Close to absolute zero, the particles exhibit their quantum nature November 10th, 2016

Spin liquid on a peak: Modelling of a magnetic material unveils an unusual state of matter that promises to advance the field of condensed matter November 9th, 2016

Graphene/ Graphite

Bumpy surfaces, graphene beat the heat in devices: Rice University theory shows way to enhance heat sinks in future microelectronics November 29th, 2016

Uncovering the secrets of friction on graphene: Sliding on flexible graphene surfaces has been uncharted territory until now November 23rd, 2016

2-D material a brittle surprise: Rice University researchers finds molybdenum diselenide not as strong as they thought November 14th, 2016

Rice expands graphene repertoire with MRI contrast agent: Metal-free fluorinated graphene shows no signs of toxicity in cell culture tests November 10th, 2016

Videos/Movies

2-D material a brittle surprise: Rice University researchers finds molybdenum diselenide not as strong as they thought November 14th, 2016

Announcements

Construction of practical quantum computers radically simplified: Scientists invent ground-breaking new method that puts quantum computers within reach December 5th, 2016

Shape matters when light meets atom: Mapping the interaction of a single atom with a single photon may inform design of quantum devices December 4th, 2016

UTSA study describes new minimally invasive device to treat cancer and other illnesses: Medicine diffusion capsule could locally treat multiple ailments and diseases over several weeks December 3rd, 2016

Novel Electrode Structure Provides New Promise for Lithium-Sulfur Batteries December 3rd, 2016

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

Construction of practical quantum computers radically simplified: Scientists invent ground-breaking new method that puts quantum computers within reach December 5th, 2016

Shape matters when light meets atom: Mapping the interaction of a single atom with a single photon may inform design of quantum devices December 4th, 2016

UTSA study describes new minimally invasive device to treat cancer and other illnesses: Medicine diffusion capsule could locally treat multiple ailments and diseases over several weeks December 3rd, 2016

Deep insights from surface reactions: Researchers use Stampede supercomputer to study new chemical sensing methods, desalination and bacterial energy production December 2nd, 2016

Water

Deep insights from surface reactions: Researchers use Stampede supercomputer to study new chemical sensing methods, desalination and bacterial energy production December 2nd, 2016

Water, water -- the two types of liquid water: Understanding water's behavior could help with Alzheimer's research November 11th, 2016

How nanoscience will improve our health and lives in the coming years: Targeted medicine deliveries and increased energy efficiency are just two of many ways October 26th, 2016

Water vapor sets some oxides aflutter: Newly discovered phenomenon could affect materials in batteries and water-splitting devices October 3rd, 2016

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