Unlock instant, AI-driven research and patent intelligence for your innovation.

Nanotube Structures, Materials, and Methods

a technology of nanotubes and nanotubes, applied in the field of materials science, can solve the problems of arrays or other sets of nanotubes having a relatively low packing density of nanotubes in the array or s

Inactive Publication Date: 2008-12-25
MOLECULAR NANOSYST
View PDF0 Cites 37 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012]Yet another aspect of the invention relates to a nanotube structure produced by a process comprising forming nanotubes on a surface of a substrate, and applying a compressiv

Problems solved by technology

However, synthesis methods for nanotubes often result in arrays or other sets of nanotubes having a relatively low packing density of nanotubes in the array or set (e.g. for carbon nanotubes, sometimes below 1% of the theoretical density of graphite).

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Nanotube Structures, Materials, and Methods
  • Nanotube Structures, Materials, and Methods
  • Nanotube Structures, Materials, and Methods

Examples

Experimental program
Comparison scheme
Effect test

example 1

Growth of vertically aligned Nanotube Structures

[0085]A four inch single crystal silicon substrate was cleaned by immersion in a 4:1 bath of H2SO4 / H2O2, maintained at 120° C., for 10 minutes. The substrate was then rinsed in water and immersed in a 5:1:1 bath of H2O / H2O2 / HCl, maintained at 90° C., for 10 minutes. The substrate was then rinsed in water and immersed in a 50:1 HF:H2O bath, at room temperature, for 1 minute. The substrate was then rinsed in water and spun dry.

[0086]500 nm of SiO2 were thermally grown on the cleaned substrate followed by 20 nm Al2O3 deposited by sputtering from an Al2O3 target. Straight, 12.5 μm wide boundaries, separating regions to become active surface, were fabricated using lithography, such that each region was a 1 mm wide strip that traversed the length of the wafer. 1 nm of Fe was then deposited on these regions using electron beam deposition, and then the photoresist mask was lifted off.

[0087]The wafer was then coated with a protective photoresis...

example 2

Compressing Nanotube Structures

[0091]A sample grown using the procedure of Example 1 is placed in an arbor press (e.g. DEVIN LP-500(TM)) and 1 ton of force applied through a polished stainless steel plate placed on top of the sample. Force is applied in a direction parallel to the growth direction.

[0092]A sample is grown using the procedure of Example 1. To establish an initial height, the sample is first z-pressed with an arbor press using metal spacers. With the spacers still in place, a glass slide is then placed over the film with two 200 g weights over the slide. The spacers are then slid in toward each other and the film is subsequently pressed in the x-direction. Further compression in the z-direction can be performed by changing the spacer heights and using the arbor press.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

Nanotube structures and methods for forming nanotube structures are disclosed. The methods include forming nanotubes such that they are associated with a surface of a substrate and compressing at least a portion of the nanotubes. In some embodiments, the nanotubes may be dimensionally constrained in one direction while being compressed in another direction. Compressing at least a portion of the nanotubes may comprise stamping an impression into a surface of the nanotubes, at least a portion of which is retained when the stamp is removed. In some embodiments, the nanotubes may be aligned with respect to one another and to the surface of the substrate and may extend in a direction that is, for example, normal to the substrate.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation-in-part of U.S. patent application Ser. No. 11 / 897,893, filed Aug. 30, 2007, which claims priority to, and the benefit of, U.S. Provisional Application Nos. 60 / 841,266, filed Aug. 30, 2006; 60 / 876,336, filed Dec. 21, 2006; and 60 / 923,904, filed Apr. 17, 2007. This application also claims priority to, and the benefit of, U.S. Provisional Patent Application No. 61 / 066,647, filed Feb. 22, 2008. The entire contents of all of those applications are incorporated by reference herein in their entireties.STATEMENT REGARDING FEDERALLY FUNDED RESEARCH AND DEVELOPMENT[0002]This invention was made with United States Government support under SBIR Contract # 0422198 from the National Science Foundation. The United States has certain rights in the invention.BACKGROUND OF THE INVENTION[0003]1. Field of the Invention[0004]The invention relates generally to the field of materials science, and more particularly to nanotube ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): D01F9/12
CPCB82Y10/00B82Y30/00B82Y40/00C01B2202/08H01L51/0048C01B32/162C01B32/172H10K85/221
Inventor PAN, LAWRENCE S.FORNACIARI, BERT
Owner MOLECULAR NANOSYST