Medindia LOGIN REGISTER
Medindia
Advertisement

Scientists are Now Able to Control Chirality in Carbon Nanotubes

by Kathy Jones on May 4, 2013 at 7:10 PM
 Scientists are Now Able to Control Chirality in Carbon Nanotubes

Ability to synthesise single-walled carbon nanotubes (SWNTs) with controlled chiralities is an ultimate goal in the field of carbon nanotube research.

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.

Advertisement

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.
Advertisement

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.



Source: Eurekalert
Font : A-A+

Advertisement

Advertisement
Advertisement

Recommended Readings

Latest Research News

New Immunotherapy for Psoriasis & Vitiligo
Scientists identified mechanisms governing immune cells, selectively removing troublemakers to reshape skin immunity. Benefits those with psoriasis, vitiligo.
2050 Forecast: 1.06 Billion Individuals to Face 'Other' Musculoskeletal Disorders
By 2050, an anticipated increase from 494 million cases in 2020 to 1.06 billion people with musculoskeletal disabilities is expected.
Gene Therapies Can Disrupt Gaucher Disease Drug Market
Experts consulted by GlobalData anticipate a significant overhaul in the Gaucher disease scenario because of forthcoming gene therapies in development.
NASH Cases Expected to Hit 26.55 Million in 7MM by 2032
Within the seven major markets, 12% to 20% of diagnosed prevalent NASH cases present severe liver damage (stage 4 liver fibrosis), denoting cirrhosis.
Can Sleep Brain Waves Defend Against Epileptic Activity?
Memory deficits in individuals with epilepsy, especially cognitive difficulties, might partially stem from the transient impairments caused by these slow waves.
View All
This site uses cookies to deliver our services.By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Use  Ok, Got it. Close
×

Scientists are Now Able to Control Chirality in Carbon Nanotubes Personalised Printable Document (PDF)

Please complete this form and we'll send you a personalised information that is requested

You may use this for your own reference or forward it to your friends.

Please use the information prudently. If you are not a medical doctor please remember to consult your healthcare provider as this information is not a substitute for professional advice.

Name *

Email Address *

Country *

Areas of Interests