Binary alloy single-crystalline metal nanostructures and fabrication method thereof

Abstract

Disclosed are a method of fabricating a binary alloy nanostructure by using metal oxides, metal substances or metal halides of metal elements used to form a binary alloy and / or binary alloy substances as a precursor through a vapor phase synthesis method and a binary alloy nanostructure fabricated by the same. More particularly, the present invention provides a method of fabricating a binary alloy nanowire or nanobelt which comprises placing a precursor on the front part of a reaction furnace and a substrate on the rear part of the furnace, and heat treating both of them under inert gas atmosphere to produce the nanowire or nanobelt and, in addition, a binary alloy nanowire or nanobelt fabricated by the method according to the present invention.

Description

[0001]This application claims priority to Korean Patent Application No. 2007-0068548, filed on Jul. 9, 2007, in the Korean Intellectual Property Office, the entire contents of which are hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to binary alloy single-crystalline metal nanostructures and a fabrication method thereof, and more particularly, to a binary alloy single-crystalline nanostructure and a method for fabrication thereof by vapor phase synthesis.[0004]2. Description of the Related Art[0005]In recent years, one dimensional (1D) nanostructures often represented by nanowires have been drawing extensive attention as a material highly applicable, especially, in semiconductor applications. Such nanostructures are expected to have various advantages including decreased size, increased aspect ratio, increased surface to volume ratio and, newly discovered phenomena and unique characteristics owing to nov...

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Benefits of technology

[0017]Accordingly, the present invention is directed to solve problems of prior art as described above and, an object of the present invention is to provide a binary alloy single-crystalline nanostructure with high quality and improved morphology, and a method for fabrication of the same through a vapor phase transport method.

[0034]The present inventive method adopts a vapor phase transport method without a catalyst to fabricate a binary alloy metal nanowire, thus improving simplicity and reproducibility in working processes for fabrication of the nanowire. This method also has advantages in that the fabricated nanowire is a high quality nanowire or nanobelt in a complete single-crystalline condition without defects and the binary alloy nanowire or nanobelt can be massively produced in a uniform size without coagulation on a single-crystalline substrate.

Problems solved by technology

Also, development of improved sensors with excellent sensitivity by domestic and / or oversea research activities is still a long way off.

However, it is known that CoAg alloy has positive combined energy in a binary system of Co and Ag and it is difficult to generate an intermetallic compound thereof.

Like CoAg alloy nanowires, no reports have yet disclosed the fabrication of nanocables or single-crystalline metal nanowires based on PdAu and / or AgTe alloys.

At present, it is difficult to produce nanocables using binary metals and, even more, using single metals.

This method is most convenient in synthesizing 1D nanostructures and is receiving increased interest in an aspect of diameter control that can regulate the diameter of a nanocable dependent on conditions for synthesis, however, it has difficulty in synthesis of single-crystalline metal nanowires.

While, the multi-crystalline metal nanowire as a set of numerous crystals induces the crystals to arrange electron spins in different directions during application of the external field, thus resulting in reduction of magnetic properties thereof.

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