Featured Research

from universities, journals, and other organizations

Tubules 'Grown' From Droplets

Date:
July 5, 2009
Source:
Mainz, Universitaet
Summary:
Since the discovery of carbon nanotubes in the early 1990s, nanotubes and nanowires have been the focus of scientific and technological interest. It has since also proved possible to produce these tiny structures from materials other than carbon. Possible applications range across many areas, including microelectronic circuits, sensor technology, and special fibre optics and light-emitting nanotubes for displays.

TEM images of nanotubes obtained when bulk SnS2 (a) and bulk SnS (b, c) were used as precursors for the synthesis of SnS2 nanotubes.
Credit: Copyright Angewandte Chemie, Wiley-VCH-Verlag

Since the discovery of carbon nanotubes in the early 1990s, nanotubes and nanowires have been the focus of scientific and technological interest. It has since also proved possible to produce these tiny structures from materials other than carbon. Possible applications range across many areas, including microelectronic circuits, sensor technology, and special fibre optics and light-emitting nanotubes for displays.

A team of researchers led by Wolfgang Tremel at Johannes Gutenberg University Mainz have now developed a new technique for producing tin disulfide nanotubes. According to the report published in the journal Angewandte Chemie, the scientists have found a way of 'growing' SnS2 tubules from a metal droplet.

It is not a new concept that metal sulfides with a lamellar structure will form nano-tubes. These are currently employed in medical devices, as fibres with extremely high tensile strength, in hydrogen storage, for rechargeable batteries, in catalysis, and in nanotechnological applications. However, a major problem associated with the synthesis of sulfide-based nanotubes is that high temperatures are required for the planar structures to be induced to bend to form cylinders. In addition, these unstable intermediate products must be trapped. This is nearly impossible in the case of tin disulfide, as the nanotube collapses already at significantly lower temperatures.

The team of researchers at Mainz University therefore implemented an alternative method for the production of tin disulfide nanotubes: They first used the vapour-liquid-solid (VLS) process, a technique more commonly used to produce semicon-ductor nanowires. Bismuth powder is combined with tin disulfide nanoflakes, and the mixture is heated in a tube furnace under an argon gas flow. The product of the reaction is deposited at the cooler end.

Nanodroplets of bismuth are formed in the furnace, and these act as local collec-tion points for tin. In this manner, the reaction partners accumulate in the metal droplets, providing the raw material from which nanotubes can be grown. Tremel explains: "In this process, the metal droplets are retained in the form of spheres at the end of the tubes, while the nanotubes grow out of them like hairs from follicles. And thanks to the catalytic effect provided by the metal droplets, it is possible to grow nanotubes even at relatively low temperatures."

Using the new technique, the team has been able to produce perfect nanotubes with diameters in a range of 30 - 40 nm and lengths of 100 - 500 nm consisting of several layers of SnS2.


Story Source:

The above story is based on materials provided by Mainz, Universitaet. Note: Materials may be edited for content and length.


Journal Reference:

  1. Yella et al. Bismuth-Catalyzed Growth of SnS2 Nanotubes and Their Stability. Angewandte Chemie International Edition, 2009; DOI: 10.1002/anie.200900546

Cite This Page:

Mainz, Universitaet. "Tubules 'Grown' From Droplets." ScienceDaily. ScienceDaily, 5 July 2009. <www.sciencedaily.com/releases/2009/06/090618085926.htm>.
Mainz, Universitaet. (2009, July 5). Tubules 'Grown' From Droplets. ScienceDaily. Retrieved September 17, 2014 from www.sciencedaily.com/releases/2009/06/090618085926.htm
Mainz, Universitaet. "Tubules 'Grown' From Droplets." ScienceDaily. www.sciencedaily.com/releases/2009/06/090618085926.htm (accessed September 17, 2014).

Share This



More Matter & Energy News

Wednesday, September 17, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Stocks Hit All-Time High as Fed Holds Steady

Stocks Hit All-Time High as Fed Holds Steady

AP (Sep. 17, 2014) The Federal Reserve signaled Wednesday that it plans to keep a key interest rate at a record low because a broad range of U.S. economic measures remain subpar. Stocks hit an all-time high on the news. (Sept. 17) Video provided by AP
Powered by NewsLook.com
Space Race Pits Bezos Vs Musk

Space Race Pits Bezos Vs Musk

Reuters - Business Video Online (Sep. 16, 2014) Amazon CEO Jeff Bezos' startup will team up with Boeing and Lockheed to develop rocket engines as Elon Musk races to have his rockets certified. Fred Katayama reports. Video provided by Reuters
Powered by NewsLook.com
MIT's Robot Cheetah Unleashed — Can Now Run, Jump Freely

MIT's Robot Cheetah Unleashed — Can Now Run, Jump Freely

Newsy (Sep. 16, 2014) MIT developed a robot modeled after a cheetah. It can run up to speeds of 10 mph, though researchers estimate it will eventually reach 30 mph. Video provided by Newsy
Powered by NewsLook.com
Manufacturer Prints 3-D Car In Record Time

Manufacturer Prints 3-D Car In Record Time

Newsy (Sep. 15, 2014) Automobile manufacturer Local Motors created a drivable electric car using a 3-D printer. Printing the body only took 44 hours. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins