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Title: Stable and metastable 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.
Inventors:
;
Issue Date:
OSTI Identifier:
1163986
Assignee:
Brookhaven Science Associates, LLC (Upton, NY) CHO
Patent Number(s):
8,890,115
Application Number:
13/526,239
Contract Number:
AC02-98CH10886
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; 36 MATERIALS SCIENCE

Other works cited in this record:

Methods of fabricating nanostructures and nanowires and devices fabricated therefrom
patent-application, April 2008

Nanowire configured to couple electromagnetic radiation to selected guided wave, devices using same, and methods of fabricating same
patent-application, October 2008

Phase structure of electrodeposited alloys
journal, August 2005

Formation of an intermediate phase in eutectic Au-Ge and Ag-Ge systems under high pressure
journal, June 1991

Metastable Metallic Alloys
journal, December 1999

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