Nanowires assembles independently into customized arrangements

Researchers at Tokyo Metropolitan University have developed a technique for making nanowires on a scale – and adjusting their arrangement – using chemical precipitation (CVD).

To continue miniaturizing electronics, packing more computing power into the same amount of space, you need to create fewer and fewer wiring and components.

A hypothetical wire thick atom, for example, would be the ultimate goal. This could create new categories of electronic and energy devices, as electrons traveling through them would behave more as if they were moving through a one-dimensional world than a three-dimensional world.

Scientists can already transform materials such as carbon nanotubes and transition metal chalcogenides (TMCs), mixtures of transition metals, and group 16 elements that can assemble themselves into nanowires of atomic proportions. They have a diameter of three atoms (with chalcogen atoms occupying the three corners of the triangle-shaped frame and metal atoms in the middle of each side) and a van der Waals surface, and have been reported to possess a one-dimensional metallic nature.

Although TMCs were discovered 40 years ago, their creation in scale and useful length is still a challenge, and mass production of nanowires has been unattainable so far.

Now the team of the University of Tokyo has developed a method for creating long wires from nanowires from telluride transition metal on an unprecedented scale.

Using CVN, these nanowires can be assembled into different configurations, depending on the substrate they use as a template. Adjusting the substrate structure allowed the researchers to make wafer-sized centimeters covered with arrangements, including atomically thin single-layer layers, double-layer, and random networks of wire bundles, all with different applications.

The structure of the nanowires themselves was highly crystalline and ordered, and their properties (including excellent conductivity and one-dimensional behavior) coincided with theoretical predictions.

The production of large quantities of long crystal nanowires will be valuable for further research of these structures, which have so far been limited due to the scarcity of TMC nanowire samples. It is also an important step towards real nanowire applications.

“The ability to achieve large-scale synthesis and manipulation of the direction of nanowire growth is important because it provides a possible means for scalable, direct routing of a TMC nanowire sample through surface engineering,” the researchers wrote in their Nano words paper. “Current discoveries offer a new platform for new studies and applications [one-dimensional] nanowires, contributing not only to new discoveries in basic low-dimensional physics, but also to the design of future applications in electronics and energy storage / conversion devices. “

The header image does not show the nanowire arrangements created in this study.

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