Wires with atomic dimensions are potential structural elements for future nanoscopic electronic components. Such fine wires have completely new electronic properties.
However, apart from the non-trivial production of metallic nanowires, their high chemical reactivity is a critical problem; they are easily oxidized in air and are not stable. Japanese researchers working with R. Kitaura and H. Shinohara have now developed a new method that is simple and delivers stable nanowires: They deposit metal atoms inside of carbon nanotubes.
As the scientists report in the journal Angewandte Chemie, this forms metal wires of individual atoms lined up side-by-side that are so well protected by their sheath that they have long-term stability.
The method of production simply involves heating carbon nanotubes and a metal powder together in a vacuum. It works for all metals that enter into a gaseous phase at relatively low temperatures, such as europium, samarium, ytterbium, and strontium. The metal atoms almost completely fill the cavity inside the carbon nanotubes. Using europium metal and carbon nanotubes with an inner diameter of about 0.76 nm, the researchers were able to obtain wires made of a single chain of individual atoms. This first true one-dimensional nanowires was also stable after one month of exposure to air.
By using carbon nanotubes with different inner diameters, ultrafine wires with various diameters could be produced, which were for example formed of two or four atomic chains. In comparison to macroscopic europium crystals, the atomic wires demonstrate significantly different electronic and magnetic properties.
The nanowires are an ideal model for the study of one-dimensional phenomena. The researchers now aim to test the properties of the wires with respect to their suitability for use as “wiring” for nanoelectronic components.
Congratulations to V. Ramakrishnan, T. A. Steitz, and A. Yonath on the receipt of the Nobel Prize in Chemistry. Yonath is a member of the editorial board of our sister journal ChemBioChem; current reviews by her are available on request.
Author: Hisanori Shinohara, Nagoya University (Japan), mailto:firstname.lastname@example.org
Title: High-Yield Synthesis of Ultrathin Metal Nanowires in Carbon Nanotubes
Angewandte Chemie International Edition 2009, 48, No. 44, doi: 10.1002/anie.200902615
Hisanori Shinohara | Angewandte Chemie
Single-stranded DNA and RNA origami go live
15.12.2017 | Wyss Institute for Biologically Inspired Engineering at Harvard
New antbird species discovered in Peru by LSU ornithologists
15.12.2017 | Louisiana State University
DNA molecules that follow specific instructions could offer more precise molecular control of synthetic chemical systems, a discovery that opens the door for engineers to create molecular machines with new and complex behaviors.
Researchers have created chemical amplifiers and a chemical oscillator using a systematic method that has the potential to embed sophisticated circuit...
MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.
Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...
Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...
Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.
To rapidly transport the right ions through the cell membrane, the tiny channels rely on a complex interplay between the ions and surrounding molecules,...
The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.
Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...
11.12.2017 | Event News
08.12.2017 | Event News
07.12.2017 | Event News
15.12.2017 | Power and Electrical Engineering
15.12.2017 | Materials Sciences
15.12.2017 | Life Sciences