Nanotechnology Now

Our NanoNews Digest Sponsors





Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > Rolling out the nanotubes: Synthesis of graphitic nanotubes containing platinum metals achieved through self-assembly techniques

Figure 1: Two examples of nanotubular assemblies fabricated from single hexabenzocoronene amphiphile building blocks (blue/grey/red spheres) and platinum (Pt) metal ions (orange spheres). 
Credit: Riken
Figure 1: Two examples of nanotubular assemblies fabricated from single hexabenzocoronene amphiphile building blocks (blue/grey/red spheres) and platinum (Pt) metal ions (orange spheres). Credit: Riken

Abstract:
Nanoscale materials with well-defined shapes, such as one-dimensional hollow tubes, have attracted the interest of scientists seeking to utilize their unique properties. Nanotubes have large inner and outer surface areas that are accessible to many smaller molecules, meaning they have the potential to be developed into new types of sensors and catalysts.

Rolling out the nanotubes: Synthesis of graphitic nanotubes containing platinum metals achieved through self-assembly techniques

Japan | Posted on July 24th, 2009

Efficient techniques to synthesize nanotubes, however, are uncommon. Now, Takuzo Aida and Takanori Fukushima of the RIKEN Advanced Science Institute in Wako and colleagues from the Japan Science and Technology Agency have developed a way to controllably self-assemble graphitic molecules and platinum metals into nanotubes with specific dimensions and structural features1.

Aida and his team used a molecule called hexabenzocoronene (HBC) as the base for their new nanotubes. Consisting of thirteen aromatic benzene rings interlocked into a large, flat cyclic structure that resembles graphite, HBC is normally used as a building block for liquid crystalline semiconductors.

In 2004, Aida, Fukushima, and colleagues discovered that by adding long hydrocarbon groups and polar chains called triethylene glycol to HBC, they could make the graphitic molecule into an amphiphile2a surfactant that can be dissolved in organic solvents. Recrystallizing a solution of the HBC amphiphiles spontaneously produced new graphitic nanotubes.

In their latest work, the researchers incorporated platinum metals into their nanotubes structures. According to Fukushima, transition metals such as platinum can add useful catalytic, electronic, luminescent, and magnetic functionalities to the nanotubes.

In order to attach platinum metals to the nanotubes, the scientists added a molecule known as pyridine, a nitrogen-containing benzene ring, to the ends of the triethylene glycol chains on the HBC amphiphile.

"Pyridine is one of the simplest and most common molecules for binding transition metals," explains Fukushima. "We thought it fit to use such a general binding molecule in our first attempt to functionalize the HBC nanotubes with transition metals."

By heating a solution of the HBC amphiphiles with platinum metal ions, then allowing the mixture to cool to room temperature, the scientists observed spontaneous formation of new metal-ion-coated graphitic nanotubes (Fig. 1). Altering the assembly conditions produced tubular assemblies with different diameters, lengths, and wall widths.

"Our nanotube can serve as a unique one-dimensional nano-scaffold with not only high structural integrity, but also with beneficial electronic properties such as energy and charge transport capabilities," says Fukushima. "We expect that the combination of these two components might lead to unprecedented phenomenon and functions."
Reference

1. Zhang, W., Jin, W., Fukushima, T., Ishii, N. & Aida, T. Metal-ion-coated graphitic nanotubes: controlled self-assembly of a pyridyl-appended gemini-shaped hexabenzocoronene amphiphile. Angewandte Chemie International Edition 121, 4841-4844 (2009).
2. Hill, J. P., Jin, W., Kosaka, A., Fukushima, T., Ichihara, H., Shimomura, T., Ito, K., Hashizume, T., Ishii, N. & Aida, T. Self-assembled hexa-peri-hexabenzocoronene graphitic nanotube. Science 304, 1481-1483 (2004).

The corresponding author for this highlight is based at the RIKEN Functional Soft Matter Engineering Team

####

For more information, please click here

Copyright © Riken

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

article

Related News Press

News and information

Haydale and Goodfellow Announce Major Distribution Agreement for Functionalised Graphene Materials July 21st, 2014

Relaunch of the Nanoscribe Website New design, optimized research, and impressive gallery of applications July 21st, 2014

Dongbu HiTek Unveils Low-Voltage BCDMOS Process for Efficient Power Management in Smart Phones and Tablet Computers July 21st, 2014

Iran to Host 1st Asian Congress on Nanostructures on Kish Island July 21st, 2014

Self Assembly

Berkeley Lab researchers create nanoparticle thin films that self-assemble in 1 minute June 9th, 2014

Design of self-assembling protein nanomachines starts to click: A nanocage builds itself from engineered components June 5th, 2014

Molecular self-assembly scales up from nanometers to millimeters June 5th, 2014

Nano world: Where towers construct themselves: How physicists get control on the self-assembly process June 2nd, 2014

Nanotubes/Buckyballs

University of Houston researchers create new method to draw molecules from live cells: Technique using magnetic nanomaterials offers promise for diagnosis, gene therapy July 17th, 2014

3-D nanostructure could benefit nanoelectronics, gas storage: Rice U. researchers predict functional advantages of 3-D boron nitride July 15th, 2014

Researchers discover boron 'buckyball' July 14th, 2014

IBM Announces $3 Billion Research Initiative to Tackle Chip Grand Challenges for Cloud and Big Data Systems: Scientists and engineers to push limits of silicon technology to 7 nanometers and below and create post-silicon future July 10th, 2014

Discoveries

Oregon chemists eye improved thin films with metal substitution: Solution-based inorganic process could drive more efficient electronics and solar devices July 21st, 2014

Steam from the sun: New spongelike structure converts solar energy into steam July 21st, 2014

More than glitter: Scientists explain how gold nanoparticles easily penetrate cells, making them useful for delivering drugs July 21st, 2014

Carbyne morphs when stretched: Rice University calculations show carbon-atom chain would go metal to semiconductor July 21st, 2014

Announcements

Oxford Instruments Asylum Research Opens an Atomic Force Microscopy Demonstration Lab in Mumbai, India July 21st, 2014

Steam from the sun: New spongelike structure converts solar energy into steam July 21st, 2014

More than glitter: Scientists explain how gold nanoparticles easily penetrate cells, making them useful for delivering drugs July 21st, 2014

Iran to Host 1st Asian Congress on Nanostructures on Kish Island July 21st, 2014

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







© Copyright 1999-2014 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE