Electrochemical deposition of carbon nanoparticles from organic solutions

• US 7,422,667 B1
• Filed: 10/18/2004
• Issued: 09/09/2008
• Est. Priority Date: 04/17/2001
• Status: Expired due to Fees

• Current Assignee: University of Central Florida Research Foundation Inc. (State University System of Florida)
• Original Assignee: University of Central Florida Research Foundation Inc. (State University System of Florida)
• Inventors: Chow, Lee, Zhou, Dan, Anoshkina, Elvira Vladimirovna
• Primary Examiner(s): Wilkins, III; Harry D
• Application Number:
  US10/699,488
• Time in Patent Office: 1,422 Days
• Field of Search: 205/202
• US Class Current: 204/230.1
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: B82Y 40/00 Manufacture or treatment of nanostructures
• CPC Class Codes: C01B 32/162 characterised by catalysts
• CPC Class Codes: Y10S 977/742 Carbon nanotubes, CNTs
• CPC Class Codes: Y10S 977/842 for carbon nanotubes or fullerenes
• CPC Class Codes: Y10S 977/899 Electrolytic

Abstract

Carbon nanoparticles including both nanofilaments and nanotubes produced by an electrochemical deposition method from organic solutions at room temperature, in which the formation and growth of carbon nanoparticles are stimulated by the catalyst, such as iron and nickel. It has been found that the electrochemical deposition conditions have a strong influence on the growth phenomenon of the carbon nanotubes. Scanning electron microscope (SEM) and transmitting electron microscope (TEM) characterizations show that the diameter of nanotubes is of the order of approximately 100 nm, and the length of filaments can be up to approximately 50 μm, depending on the size of catalyst particles.

Claims

1. An electrochemical deposition apparatus for producing carbon nanoparticles comprising the components of:

(a) a container having a closed bottom portion and an open top portion, suitable for housing a liquid hydrocarbon selected from at least one of methanol, and benzyl alcohol and mixtures thereof;

(b) a silicon wafer anode and a silicon wafer cathode each coated with catalytic nanoparticles of iron and nickel, wherein the anode and cathode are spaced apart and positioned in the bottom portion of the container as two electrodes in a plurality of electrodes in said container;

(c) a magnetic stirrer for agitating the liquid hydrocarbon in the container; and

(d) a power supply with an ammeter and a voltmeter connected between the anode and the cathode for imposing a direct current potential of approximately 1000 volts between the two electrodes and providing a current density of approximately 12 miliamps per square centimeter between the two electrodes for a time sufficient that carbon nanoparticles are deposited on said the two electrodes, wherein each of the carbon nanoparticles includes;

a nanotube produced from the organic solution under ambient conditions having a diameter ranging from approximately 50 nm to approximately 100 nm and a length ranging from approximately 2 nm to approximately 50 μ

m.

2. The apparatus of claim 1, wherein the container for housing the liquid hydrocarbon is made of at least one of glass or ceramic material.

3. The apparatus of claim 1, wherein the plurality of electrodes further includes a reference electrode to monitor the electrochemical activity in the container.