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Segmented Nanowires Displaying Locally Controllable Properties

Brookhaven National Laboratory

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<p>
	Changes in nanowire diameter on cooling below the bulk eutectic temperature.</p>

Changes in nanowire diameter on cooling below the bulk eutectic temperature.

Technology Marketing Summary

The electrical, chemical, mechanical, and optical properties of nanostructures depend on their physical dimensions and chemical compositions. Current methods of forming nanowires rely on knowing the average values for these parameters. As a result, there is poor control over local properties of the nanowires, which may vary from spot to spot in an uncontrolled fashion. By using knowledge of the size-dependent phase diagram, the inventors have developed methods of controlling the properties of nanowires precisely over regions on the order of a nanometer. These nanowires can be used in robust and reliable optical and electronic devices.

Description

Vapor-liquid-solid growth of nanowires is tailored to achieve complex one-dimensional material geometries using phase diagrams determined for nanoscale materials. Segmented one-dimensional nanowires having constant composition display locally variable electronic band structures that are determined by the diameter of the nanowires. The unique electrical and optical properties of the segmented nanowires are exploited to form electronic and optoelectronic devices.

Benefits

This method offers a means to control the local electronic and optical properties of nanowires on the order of a nanometer.

Applications and Industries

The unique electrical and optical properties of the segmented nanowires are exploited to form electronic and optoelectronic devices.

More Information

Sutter and Sutter, “Phase Diagram of Nanoscale Alloy Particles Used for Vapor-Liquid-Solid Growth of Semiconductor Nanowires,” Nano Letters, 8, 411-414 (2008) doi:10.1021/nl0719630

Patents and Patent Applications
ID Number
Title and Abstract
Primary Lab
Date
Patent 8,389,387
Patent
8,389,387
Segmented nanowires displaying locally controllable properties
Vapor-liquid-solid growth of nanowires is tailored to achieve complex one-dimensional material geometries using phase diagrams determined for nanoscale materials. Segmented one-dimensional nanowires having constant composition display locally variable electronic band structures that are determined by the diameter of the nanowires. The unique electrical and optical properties of the segmented nanowires are exploited to form electronic and optoelectronic devices. Using gold-germanium as a model system, in situ transmission electron microscopy establishes, for nanometer-sized Au--Ge alloy drops at the tips of Ge nanowires (NWs), the parts of the phase diagram that determine their temperature-dependent equilibrium composition. The nanoscale phase diagram is then used to determine the exchange of material between the NW and the drop. The phase diagram for the nanoscale drop deviates significantly from that of the bulk alloy.
Brookhaven National Laboratory 03/05/2013
Issued
Technology Status
Technology IDDevelopment StageAvailabilityPublishedLast Updated
BSA 08-23PrototypeAvailable04/22/201104/22/2011

Contact BNL About This Technology

To: Avijit Sen<asen@bnl.gov>