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Hongjie Te Dai

from Cupertino, CA
Age ~58

Hongjie Dai Phones & Addresses

  • 20777 Hanford Dr, Cupertino, CA 95014 (408) 873-7351
  • Mountain View, CA
  • Houston, TX
  • Sunnyvale, CA
  • Cambridge, MA
  • Santa Clara, CA
  • 20777 Hanford Dr, Cupertino, CA 95014

Work

Company: Stanford university Sep 1997 Position: Professor at stanford university

Education

Degree: Doctorates, Doctor of Philosophy School / High School: Harvard University 1992 to 1995 Specialities: Philosophy

Industries

Higher Education

Resumes

Resumes

Hongjie Dai Photo 1

Professor At Stanford University

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Location:
4238 Rickeys Way, Palo Alto, CA 94306
Industry:
Higher Education
Work:
Stanford University
Professor at Stanford University

Rice University Jul 1995 - Jul 1997
Postdoc
Education:
Harvard University 1992 - 1995
Doctorates, Doctor of Philosophy, Philosophy
Columbia University In the City of New York 1989 - 1992
Masters, Chemistry
Tsinghua University 1984 - 1989
Bachelors, Applied Physics

Publications

Us Patents

Carbon Nanotube Structures Made Using Catalyst Islands

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US Patent:
6346189, Feb 12, 2002
Filed:
Aug 14, 1998
Appl. No.:
09/133948
Inventors:
Hongjie Dai - Sunnyvale CA
Calvin F. Quate - Stanford CA
Hyongsok Soh - Stanford CA
Jing Kong - Stanford CA
Assignee:
The Board of Trustees of the Leland Stanford Junior University - Palo Alto CA
International Classification:
G01B 528
US Classification:
205766, 423445 R, 423453, 73105
Abstract:
The present invention includes several nanotube structures which can be made using catalyst islands disposed on a substrate (e. g. silicon, alumina, or quartz) or on the free end of an atomic force microscope cantilever. The catalyst islands are capable of catalyzing the growth of carbon nanotubes from carbon containing gases (e. g. methane). The present invention includes an island of catalyst material (such as Fe O ) disposed on the substrate with a carbon nanotube extending from the island. Also included in the present invention is a pair of islands with a nanotube extending between the islands, electrically connecting them. Conductive metal lines connected to the islands (which may be a few microns on a side) allows for external circuitry to connect to the nanotube. Such a structure can be used in many different electronic and microelectromechanical devices. For example, a nanotube connected between two islands can function as a resonator if the substrate beneath the nanotube is etched away.

Carbon Nanotubes And Methods Of Fabrication Thereof Using A Liquid Phase Catalyst Precursor

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US Patent:
6401526, Jun 11, 2002
Filed:
Dec 10, 1999
Appl. No.:
09/467096
Inventors:
Hongjie Dai - Sunnyvale CA
Calvin F. Quate - Stanford CA
Robert J. Chen - Palo Alto CA
Assignee:
The Board of Trustees of the Leland Stanford Junior University - Stanford CA
International Classification:
G01B 5028
US Classification:
73105, 4234473
Abstract:
Single-walled carbon nanotube (SWNT) probe-tips for atomic force microscopy (AFM) are realized by direct synthesis of SWNTs on silicon pyramids integrated onto AFM cantilevers. The growth of SWNT tips involves dip coating of silicon pyramids with a liquid phase catalyst followed by chemical vapor deposition (CVD) using methane. Van der Waals interactions between the silicon pyramidal surface and the nanotube ensure proper SWNT orientation. Production of large scale arrays of nanotube probe tips using contact printing and controllably shortening nanotubes in an inert discharge are also described.

Carbon Nanotube Devices

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US Patent:
6528020, Mar 4, 2003
Filed:
May 19, 2000
Appl. No.:
09/574393
Inventors:
Hongjie Dai - Sunnyvale CA
Jing Kong - Menlo Park CA
Assignee:
The Board of Trustees of the Leland Stanford Junior University - Palo Alto CA
International Classification:
G01N 2700
US Classification:
422 98, 422 8202, 422 8203
Abstract:
This invention provides an assembly of novel nanotube devices that can be employed in a variety of applications. In particular, the nanotube devices of the present invention provide a new class of versatile chemical and biological sensors. The present invention describes methods for growing individual nanotubes in a controlled fashion and for manipulating and integrating the nanotubes into functional devices. It further provides methods for modifying the nanotubes such that their sensitivity to a wide range of chemical and biological species can be achieved.

Carbon Fibers Formed From Single-Wall Carbon Nanotubes

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US Patent:
6683783, Jan 27, 2004
Filed:
Dec 22, 1999
Appl. No.:
09/380545
Inventors:
Richard E. Smalley - Houston TX
Daniel T. Colbert - Houston TX
Hongjie Dai - Sunnyvale CA
Jie Liu - Houston TX
Andrew G. Rinzler - Newberry FL
Jason H. Hafner - Somerville MA
Ken Smith - Spring TX
Ting Guo - La Jolla CA
Pavel Nikolaev - Houston TX
Andreas Thess - Kusterdingen, DE
Assignee:
William Marsh Rice University - Houston TX
International Classification:
D01F 912
US Classification:
361502, 423445 B, 4234472
Abstract:
A method for purifying a mixture comprising single-wall carbon nanotubes and amorphous carbon contaminate is disclosed. The method includes the steps of heating the mixture under oxidizing conditions sufficient to remove the amorphous carbon, followed by recovering a product comprising at least about 80% by weight of single-wall carbon nanotubes. A method for producing tubular carbon molecules of about 5 to 500 nm in length is also disclosed. The method includes the steps of cutting single-wall nanotube containing-material to form a mixture of tubular carbon molecules having lengths in the range of 5-500 nm and isolating a fraction of the molecules having substantially equal lengths. The nanotubes may be used, singularly or in multiples, in power transmission cables, in solar cells, in batteries, as antennas, as molecular electronics, as probes and manipulators, and in composites.

Method For Growing Continuous Fiber

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US Patent:
6749827, Jun 15, 2004
Filed:
Dec 28, 2001
Appl. No.:
10/032732
Inventors:
Richard E. Smalley - Houston TX
Daniel T. Colbert - Houston TX
Hongjie Dai - Sunnyvale CA
Jie Liu - Houston TX
Andrew G. Rinzler - Houston TX
Jason H. Hafner - Houston TX
Kenneth A. Smith - Houston TX
Ting Guo - La Jolla CA
Pavel Nikolaev - Houston TX
Andreas Thess - Martinsried, DE
Assignee:
William Marsh Rice University - Houston TX
International Classification:
D01F 912
US Classification:
4234473
Abstract:
This invention relates generally to a method for growing carbon fiber from single-wall carbon nanotube (SWNT) molecular arrays. In one embodiment, the present invention involves a macroscopic molecular array of at least about 10 tubular carbon molecules in generally parallel orientation and having substantially similar lengths in the range of from about 50 to about 500 nanometers. The hemispheric fullerene cap is removed from the upper ends of the tubular carbon molecules in the array. The upper ends of the tubular carbon molecules in the array are then contacted with a catalytic metal. A gaseous source of carbon is supplied to the end of the array while localized energy is applied to the end of the array in order to heat the end to a temperature in the range of about 500Â C. to about 1300Â C. The growing carbon fiber is continuously recovered.

Method For Growing Single-Wall Carbon Nanotubes Utilizing Seed Molecules

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US Patent:
6756025, Jun 29, 2004
Filed:
Dec 21, 2001
Appl. No.:
10/027568
Inventors:
Daniel T. Colbert - Houston TX
Hongjie Dai - Sunnyvale CA
Jason H. Hafner - Houston TX
Andrew G. Rinzler - Houston TX
Richard E. Smalley - Houston TX
Assignee:
William Marsh Rice University - Houston TX
International Classification:
D01F 9127
US Classification:
4234473, 423445 B
Abstract:
This invention relates generally to a method for growing single-wall carbon nanotube (SWNT) from seed molecules. The supported or unsupported SWNT seed materials can be combined with a suitable growth catalyst by opening SWNT molecule ends and depositing a metal atom cluster. In one embodiment, a suspension of seed particles containing attached catalysts is injected into an evaporation zone to provide an entrained reactive nanoparticle. A carbonaceous feedstock gas is then introduced into the nanoparticle stream under conditions to grow single-wall carbon nanotubes. Recovery of the product produced can be done by filtration, centrifugation and the like.

Method For Growing Continuous Carbon Fiber And Compositions Thereof

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US Patent:
6756026, Jun 29, 2004
Filed:
Dec 21, 2001
Appl. No.:
10/027750
Inventors:
Daniel T. Colbert - Houston TX
Hongjie Dai - Sunnyvale CA
Jason H. Hafner - Houston TX
Andrew G. Rinzler - Houston TX
Richard E. Smalley - Houston TX
Kenneth A. Smith - Katy TX
Jie Liu - Chapel Hill NC
Ting Guo - Davis CA
Pavel Nikolaev - Houston TX
Andreas Thess - Kusterdingen, DE
Assignee:
William Marsh Rice University - Houston TX
International Classification:
D01F 912
US Classification:
4234473, 4234471, 4234472, 423445 R
Abstract:
This invention relates generally to a method for growing carbon fiber from single-wall carbon nanotube (SWNT) molecular arrays. The carbon fiber which comprises an aggregation of substantially parallel carbon nanotubes may be produced by growth (elongation) of a suitable seed molecular array. The first step is to open the growth end of the SWNTs in the molecular array. Next, a transition metal catalyst is added to the open-ended seed array. In the next step, the SWNT molecular array with catalyst deposited on the open tube ends is subjected to tube growth (extension) conditions. The carbon supply necessary to grow the SWNT molecular array into a continuous fiber is supplied to the SWNT molecular array tip heated to a temperature sufficient to cause growth to any desired length. The continuous carbon fiber can also be grown from more than one separately prepared molecular arrays or templates.

Method For Producing A Catalyst Support And Compositions Thereof

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US Patent:
6824755, Nov 30, 2004
Filed:
Dec 21, 2001
Appl. No.:
10/027753
Inventors:
Daniel T. Colbert - Houston TX
Hongjie Dai - Sunnyvale CA
Jason H. Hafner - Houston TX
Andrew G. Rinzler - Houston TX
Richard E. Smalley - Houston TX
Assignee:
William Marsh Rice University - Houston TX
International Classification:
D01F 912
US Classification:
4234471, 502174, 502180, 50252714
Abstract:
This invention relates generally to a method for producing single-wall carbon nanotube (SWNT) catalyst supports and compositions thereof. In one embodiment, SWNTs or SWNT structures can be employed as the support material. A transition metal catalyst is added to the SWNT. In a preferred embodiment, the catalyst metal cluster is deposited on the open nanotube end by a docking process that insures optimum location for the subsequent growth reaction. The metal atoms may be subjected to reductive conditions.

Wikipedia

Hgjie Dai

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Hongjie Dai (born May 2, 1966 in Shaoyang, China) is a Chinese-American Chemist and Applied Physicist, the J.G. Jackson & C.J. Wood Professor of Chemistry ...

Wikipedia References

Hongjie Dai Photo 2

Hongjie Dai

About:
Born:

02 May 1966 • Shaoyang , People's Republic of China

Known for:

carbon nanotubes

Work:
Area of science:

Physicist

Company:

Stanford University Department of Chemistry

Position:

Physicist

Education:
Studied at:

Columbia University • Harvard University

Professional scientist:

Chemist

Skills & Activities:
Ascribed status:

American of Chinese descent • Fellow of the American Academy of Arts and Sciences • Fellow of the American Association for the Advancement of Science

Hongjie Dai Photo 3

Hongjie Dai

Hongjie Te Dai from Cupertino, CA, age ~58 Get Report