Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

Home > Press > Tubes Grow From Drops

Nanotubes of tin disulfide were fabricated from SnS2 nanoflakes by the vapor-liquid-solid process using bismuth nanodroplets as a catalyst. The SnS2 reagent in the gas phase preferentially adsorbs onto the bismuth particles; upon cooling, nucleation and growth of SnS2 nanotubes occurs (see HRTEM image). Annealing the nanotubes results in the formation of SnS2/SnS superlattices.
Nanotubes of tin disulfide were fabricated from SnS2 nanoflakes by the vapor-liquid-solid process using bismuth nanodroplets as a catalyst. The SnS2 reagent in the gas phase preferentially adsorbs onto the bismuth particles; upon cooling, nucleation and growth of SnS2 nanotubes occurs (see HRTEM image). Annealing the nanotubes results in the formation of SnS2/SnS superlattices.

Abstract:
Bismuth-catalyzed growth of tin sulfide nanotubes

Tubes Grow From Drops

Posted on June 15th, 2009

Since the discovery of carbon nanotubes in the early 1990s, nanotubes and nanowires have been the focus of much scientific attention. Aside from carbon, nanotubes have since been made from various other materials. Possible applications for these nanostructures range across many fields, including microelectronic circuits, sensors, and special light conductors and light-emitting nanotubes for displays. A research team headed by Wolfgang Tremel at the University of Mainz has now developed a new process for the production of tin sulfide nanotubes. As reported in the journal Angewandte Chemie, the researchers let the SnS2 tubes "grow" out of a drop of metal.

Metal sulfides with a lamellar structure that form inorganic nanotubes are not a new concept. They are currently in use in medical technology, for fibers with ultrahigh tensile strength, in hydrogen storage, for rechargeable batteries, in catalysis, and in nanotechnology. One fundamental problem with the fabrication of sulfidic nanotubes is the need for high temperatures to make the planar layers bend and fuse into tubes. In addition, they must be trapped as unstable intermediates. In the case of tin disulfide, this is nearly impossible, however, because the compound decomposes at a significantly lower temperature.

The Mainz researchers thus implemented a different process for the production of tin disulfide nanotubes: they first used a vapor-liquid-solid (VLS) process, a method normally used in the production of semiconducting nanowires. Bismuth metal powder is mixed with tin sulfide nanoflakes and heated in a tube furnace under an argon stream. The reaction product is deposited at the cooler end of the tube.

Nanodroplets of bismuth are formed inside the oven; these act as local points of contact for the tin. In this way, the reaction partners become concentrated within the metal droplet, which then serves as the nucleus for growth of the nanotubes. "In this process, the metal drop is obtained as a sphere at the end of the tube, and the nanotubes grow out of the sphere like a hair out of a follicle," explains Tremel. "Catalysis by the metal droplet makes growth possible at low temperatures."

The new method allowed the scientists to produce nanotubes made of several SnS2 layers with few defects, diameters between 30 and 40 nm, and lengths between 100 and 500 nm.

Author: Wolfgang Tremel, Universität Mainz (Germany), www.ak-tremel.chemie.uni-mainz.de/

Title: Bismuth-Catalyzed Growth of SnS2 Nanotubes and Their Stability

Angewandte Chemie International Edition, doi: 10.1002/anie.200900546

####

Copyright © Angewandte Chemie

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 News Press

News and information

Chains of nanogold – forged with atomic precision September 23rd, 2016

Tattoo therapy could ease chronic disease: Rice-made nanoparticles tested at Baylor College of Medicine may help control autoimmune diseases September 23rd, 2016

Nanotech Grants Options September 22nd, 2016

Coffee-infused foam removes lead from contaminated water September 21st, 2016

Display technology/LEDs/SS Lighting/OLEDs

New perovskite research discoveries may lead to solar cell, LED advances September 12th, 2016

Silicon nanoparticles instead of expensive semiconductors: Within an international collaboration, physicists of the Moscow State University replace expensive semiconductors with affordable silicon nanoparticles for display production September 9th, 2016

Low-cost and defect-free graphene: FAU researchers make key break-through September 7th, 2016

Lowering the cost and environmental footprint of white LEDs September 1st, 2016

Possible Futures

Chains of nanogold – forged with atomic precision September 23rd, 2016

Tattoo therapy could ease chronic disease: Rice-made nanoparticles tested at Baylor College of Medicine may help control autoimmune diseases September 23rd, 2016

Coffee-infused foam removes lead from contaminated water September 21st, 2016

Towards Stable Propagation of Light in Nano-Photonic Fibers September 20th, 2016

Nanotubes/Buckyballs/Fullerenes

Semiconducting inorganic double helix: New flexible semiconductor for electronics, solar technology and photo catalysis September 15th, 2016

World's most powerful X-ray takes a 'sledgehammer' to molecules September 14th, 2016

Researchers design solids that control heat with spinning superatoms: Carnegie Mellon University and Columbia University collaborators discover the cause of vastly different thermal conductivities in superatomic structural analogues September 8th, 2016

For first time, carbon nanotube transistors outperform silicon September 8th, 2016

Sensors

Chains of nanogold – forged with atomic precision September 23rd, 2016

Speedy bacteria detector could help prevent foodborne illnesses September 21st, 2016

NIST Patents Single-Photon Detector for Potential Encryption and Sensing Apps September 16th, 2016

Notre Dame researchers find transition point in semiconductor nanomaterials September 6th, 2016

Announcements

Chains of nanogold – forged with atomic precision September 23rd, 2016

Tattoo therapy could ease chronic disease: Rice-made nanoparticles tested at Baylor College of Medicine may help control autoimmune diseases September 23rd, 2016

Nanotech Grants Options September 22nd, 2016

Coffee-infused foam removes lead from contaminated water September 21st, 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







Car Brands
Buy website traffic