Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

Home > Press > Scientists reach the ultimate goal -- controlling chirality in carbon nanotubes

This image shows the initial carbon cap formation on Co nanoparticles.

Credit: Esko Kauppinen
This image shows the initial carbon cap formation on Co nanoparticles.

Credit: Esko Kauppinen

Abstract:
An ultimate goal in the field of carbon nanotube research is to synthesise single-walled carbon nanotubes (SWNTs) with controlled chiralities. Twenty years after the discovery of SWNTs, scientists from Aalto University in Finland, A.M. Prokhorov General Physics Institute RAS in Russia and the Center for Electron Nanoscopy of Technical University of Denmark (DTU) have managed to control chirality in carbon nanotubes during their chemical vapor deposition synthesis.

Scientists reach the ultimate goal -- controlling chirality in carbon nanotubes

Aalto, Finland | Posted on April 29th, 2013

Carbon nanotube structure is defined by a pair of integers known as chiral indices (n,m), in other words, chirality.

Chirality defines the optical and electronic properties of carbon nanotubes, so controlling it is a key to exploiting their practical applications, says Professor Esko I. Kauppinen, the leader of the Nanomaterials Group in Aalto University School of Science.

Over the years, substantial progress has been made to develop various structure-controlled synthesis methods. However, precise control over the chiral structure of SWNTs has been largely hindered by a lack of practical means to direct the formation of the metal nanoparticle catalysts and their catalytic dynamics during tube growth.

We achieved an epitaxial formation of Co nanoparticles by reducing a well-developed solid solution in CO, reveals Maoshuai He, a postdoctoral researcher at Aalto University School of Chemical Technology.

For the first time, the new catalyst was employed for selective growth of SWNTs, adds senior staff scientist Hua Jiang from Aalto University School of Science.

By introducing the new catalysts into a conventional CVD reactor, the research team demonstrated preferential growth of semiconducting SWNTs (~90%) with an exceptionally high population of (6,5) tubes (53%) at 500 °C. Furthermore, they also showed a shift of the chiral preference from (6,5) tubes at 500 °C to (7, 6) and (9, 4) nanotubes at 400 °C.

These findings open new perspectives both for structural control of SWNTs and for elucidating their growth mechanisms, thus are important for the fundamental understanding of science behind nanotube growth, comments Professor Juha Lehtonen from Aalto University.

This work is financially supported by the CNB-E project in Aalto University through the Multidisciplinary Institute of Digitalization and Energy (MIDE) program and the Aalto Energy Efficiency program project (MOPPI). This work made use of facilities at Nanomicroscopy Center of Aalto University in Finland and at the Center for Electron Nanoscopy at the Technical University in Denmark sponsored by the A.P. Møller and Chastine Mc-Kinney Møller Foundation.

####

About Aalto University
Aalto University, Finland is a new multidisciplinary science and art community in the fields of science, economics, and art and design. The University is founded on Finnish strengths, and its goal is to develop as a unique entity to become one of the world's top universities. Aalto University's cornerstones are its strengths in education and research. At the new University, there are 20,000 basic degree and graduate students as well as a staff of 5,000 of which 350 are professors.

For more information, please click here

Contacts:
Esko I. Kauppinen

358-405-098-064

Copyright © Aalto University

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

The research has been recently published in a new Nature Publishing Group journal Scientific Reports, 3 (2013), 1460.

Related News Press

News and information

Band Gaps, Made to Order: Engineers create atomically thin superlattice materials with precision September 26th, 2017

Assembly of nanoparticles proceeds like a zipper: Viruses and nanoparticles can be assembled into processable superlattice wires according to scientists from Aalto University Finland September 25th, 2017

Enhancing the sensing capabilities of diamonds with quantum properties: A simple method can give diamonds the special properties needed for quantum applications such as sensing magnetic fields September 24th, 2017

Quantum twisted Loong confirms the physical reality of wavefunctions September 23rd, 2017

Videos/Movies

DNA triggers shape-shifting in hydrogels, opening a new way to make 'soft robots' September 21st, 2017

Chemistry

Copper catalyst yields high efficiency CO2-to-fuels conversion: Berkeley Lab scientists discover critical role of nanoparticle transformation September 20th, 2017

Chemical hot spots: Scanning tunneling microscopy measurements identify active sites on catalyst surfaces September 7th, 2017

More durable, less expensive fuel cells: University of Delaware researchers have developed a new technology that could speed up the commercialization of fuel cell vehicles September 5th, 2017

Research shows how DNA molecules cross nanopores: Study could inform biosensors, manufacturing, and more September 5th, 2017

Nanotubes/Buckyballs/Fullerenes/Nanorods

How to draw electricity from the bloodstream: A one-dimensional fluidic nanogenerator with a high power-conversion efficiency September 11th, 2017

Silk could improve sensitivity, flexibility of wearable body sensors August 20th, 2017

Regulation of two-dimensional nanomaterials: New driving force for lithium-ion batteries July 26th, 2017

Killing cancer in the heat of the moment: A new method efficiently transfers genes into cells, then activates them with light. This could lead to gene therapies for cancers July 9th, 2017

Discoveries

Band Gaps, Made to Order: Engineers create atomically thin superlattice materials with precision September 26th, 2017

Assembly of nanoparticles proceeds like a zipper: Viruses and nanoparticles can be assembled into processable superlattice wires according to scientists from Aalto University Finland September 25th, 2017

Quantum twisted Loong confirms the physical reality of wavefunctions September 23rd, 2017

Application of air-sensitive semiconductors in nanoelectronics: 2-D semiconductor gallium selenide in encapsulated nanoelectronic devices September 22nd, 2017

Announcements

Band Gaps, Made to Order: Engineers create atomically thin superlattice materials with precision September 26th, 2017

Assembly of nanoparticles proceeds like a zipper: Viruses and nanoparticles can be assembled into processable superlattice wires according to scientists from Aalto University Finland September 25th, 2017

Enhancing the sensing capabilities of diamonds with quantum properties: A simple method can give diamonds the special properties needed for quantum applications such as sensing magnetic fields September 24th, 2017

Quantum twisted Loong confirms the physical reality of wavefunctions September 23rd, 2017

Grants/Sponsored Research/Awards/Scholarships/Gifts/Contests/Honors/Records

Magnetic cellular 'Legos' for the regenerative medicine of the future September 12th, 2017

Quantum detectives in the hunt for the world's first quantum computer September 8th, 2017

New results reveal high tunability of 2-D material: Berkeley Lab-led team also provides most precise band gap measurement yet for hotly studied monolayer moly sulfide August 26th, 2017

A more complete picture of the nano world August 24th, 2017

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