摘要:
Methods for producing nanostructures from copper-based catalysts on porous substrates, particularly silicon nanowires on carbon-based substrates for use as battery active materials, are provided. Related compositions are also described. In addition, novel methods for production of copper-based catalyst particles are provided. Methods for producing nanostructures from catalyst particles that comprise a gold shell and a core that does not include gold are also provided.
摘要:
The present disclosure relates to nanoscale device comprising an elongated crystalline nanostructure, such as a nanowire crystal, a nanowhisker crystal or a nanorod crystal, and a method for producing thereof. One embodiment relates to a nanoscale device comprising an elongated crystalline semiconductor nanostructure, such as a nanowire (crystal) or nanowhisker (crystal) or nanorod (crystal), having a plurality of substantially plane side facets, a crystalline structured first facet layer of a superconductor material covering at least a part of one or more of said side facets, and a second facet layer of a superconductor material covering at least a part of the first facet layer, the superconductor material of the second facet layer being different from the superconductor material of the first facet layer, wherein the crystalline structure of the semiconductor nanostructure is epitaxially matched with the crystalline structure of the first facet layer on the interface between the two crystalline structures.
摘要:
A resonant tunneling diode, and other one dimensional electronic, photonic structures, and electromechanical MEMS devices, are formed as a heterostructure in a nanowhisker by forming length segments of the whisker with different materials having different band gaps. Thus a resonant tunneling diode comprises a nanowhisker having a seed particle melt at one end, and a column of a constant diameter with a nanometer dimension, such as to exhibit quantum confinement effects, the column comprising first and second semiconductor portions comprising respectively an emitter and a collector, and, disposed between the first and second semiconductor portions, third and fourth portions of material having a different band gap from that of the first and second semiconductor portions, and a fifth central portion of a semiconductor material having a different band gap from that of the third and fourth portions, disposed between the third and fourth portions and forming a quantum weil. The RTD is made by a method including depositing a seed particle on a substrate, and exposing the seed particle to materials under controlled conditions of temperature and pressure such as to form a melt with the seed particle, so that the seed particle rises on top of a column whereby to form a nanowhisker, the column of the nanowhisker having a constant diameter of a nanometer dimension; during the growth of the column, selectively changing the compositions of said gases whereby to abruptly change the composition of the material of the column at regions along its length, whilst retaining epitaxial growth, wherein lattice mismatch between the materials of the portions is accommodated by radial outward bulging of the whisker at the boundaries.
摘要:
The invention relates, inter alia, to a method for producing a conductor structure, comprising at least one silicon nanowire (4) having a diameter of less than 50 nm, which nanowire is contacted via at least two points by electrodes (11, 13, 30), and wherein the at least one nanowire (4) and the electrodes (11, 13, 30) are arranged on one plane on a substrate (1, 5), which is characterized in that a) catalytically active metal nanoparticles having a diameter in the range of 0.5-50 nm are deposited on the surface (2) of an insulating substrate (1), b) the surface and the metal nanoparticles deposited thereon are exposed to a gas flow containing at least one gaseous silicon component at a temperature in the range of 300-1100 ºC and during a time period in the range of 10-200 minutes, wherein at least one nanowire (4) of a length in the range of 5-200 μm projecting from the substrate is formed, c) said at least one nanowire (4) projecting from the surface of the substrate (1) is deposited in one plane with one of the contact surfaces (6) corresponding to the surface (2) of the insulating substrate (1) by applying a secondary substrate (5), and d) either the at least one nanowire (4) deposited on the insulating substrate (1) is contacted at two different points by electrodes (11, 13, 30) or the at least one nanowire adhering to the secondary substrate (5) is contacted at two different points by electrodes (11, 13, 30).
摘要:
Methods for producing nanostructures from copper-based catalysts on porous substrates, particularly silicon nanowires on carbon-based substrates for use as battery active materials, are provided. Related compositions are also described. In addition, novel methods for production of copper-based catalyst particles are provided. Methods for producing nanostructures from catalyst particles that comprise a gold shell and a core that does not include gold are also provided.
摘要:
The invention relates to a method of forming a nanostructure. A first one-dimensional nano-element is grown for a predetermined period of time. After completion of the predetermined period of time, a catalytic particle is provided on a periphery of the first one-dimensional nano-element. From a periphery of the first one-dimensional nano-element a second one-dimensional nano-element is grown, extending transversely to the first one-dimensional nano-element. The invention also relates to a nanostructure comprising a first one-dimensional nanoelement, a second one-dimensional nanoelement grown on and extending transversely from a periphery of the first one-dimensional nanoelement, and a third one-dimensional nanoelement grown on and extending transversely from a periphery of the second one-dimensional nanoelement.
摘要:
Systems and methods for nanowire growth, doping and harvesting are provided, including methods for epitaxial oriented naπowire growth using a combination of silicon precursors, as well as use of patterned substrates to grow oriented nanowires. Improvements in nanowire quality are made through the use of sacrificial growth layers. Methods for transferring nanowires from one substrate to another substrate are also provided.
摘要:
The present invention is directed to methods to harvest, integrate and exploit nanomaterials, and particularly elongated nanowire materials. The invention provides methods for harvesting nanowires that include selectively etching a sacrificial layer placed on a nanowire growth substrate to remove nanowires. The invention also provides methods for integrating nanowires into electronic devices that include placing an outer surface of a cylinder in contact with a fluid suspension of nanowires and rolling the nanowire coated cylinder to deposit nanowires onto a surface. Methods are also provided to deposit nanowires using an ink-jet printer or an aperture to align nanowires. Additional aspects of the invention provide methods for preventing gate shorts in nanowire based transistors. Additional methods for harvesting and integrating nanowires are provided.