Method of carbon coating on nanoparticle and carbon coated nanoparticle produced by the same

Patent metadata

Field	Value
Publication number	US-10427982-B2
Application number	US-201615267307-A
Country	US
Kind code	B2
Filing date	Sep 16, 2016
Priority date	Sep 17, 2015
Publication date	Oct 1, 2019
Grant date	Oct 1, 2019

Abstract

A method includes: supplying sources or nanoparticles of any one or two or more combinations selected from a group which consists of a carbon source, a doping source, a doped element containing carbon source, and a waste plastic source into a high-temperature and high-pressure closed autoclave, completely closing the high-temperature and high-pressure closed autoclave, and forming a nanoparticle-carbon core-shell structure by a single process by coating a carbon layer on the surface of the nanoparticles or forming a core-shell structure of nanoparticle-doped carbon by the single process by coating a carbon layer doped with the doped element on the surface of the nanoparticles under pressure self-generated in the autoclave and a reaction temperature in the range of 500 to 850° C. by heating the autoclave.

First claim

What is claimed is:

1. A method including:
supplying only nanoparticles and sources of any one or two or more combinations selected from a group which consists of a carbon source, a doping source, a carbon source capable of providing a doped element, and a waste plastic source into a high-temperature and high-pressure closed autoclave;
completely closing the high-temperature and high-pressure closed autoclave; and
forming a core-shell structure of the nanoparticle-a carbon shell or a core-shell structure of the nanoparticle-a carbon shell having the doped element by a single process under self-generated pressure and a first reaction temperature in the range of 500 to 850° C. by heating the autoclave,
wherein the method further comprises an additional functioning:
making the autoclave to a high-temperature and atmospheric state by removing gas from the autoclave in a state of high-temperature and high-pressure and thereafter, purging the autoclave by using an inert gas;
changing temperature up to a second reaction temperature for functioning and performing reaction while supplying a reaction gas; and
cooling the autoclave to room-temperature while purging the autoclave with an inert gas.

2. The method of claim 1 , wherein
the sources are used to form the carbon shell or the carbon shell having the doped element without loss during the forming of the core-shell structure of the nanoparticle-a carbon shell or the core-shell structure of the nanoparticle-a carbon shell having the doped element.

3. The method of claim 1 , wherein
the sources are solid and the sources are supplied based on a weight ratio (wt % ratio) of the nanoparticles and the carbon source,
the sources are the liquid and the sources are supplied based on a volume ratio (Vol % ratio) of a capacity of the autoclave and the carbon source, and
the source is gas and the sources are supplied based on a pressure of the gas, which is set based on the volume of the autoclave.

4. The method of claim 1 , wherein
the carbon source is benzene (C 6 H 6 ), toluene (C 7 H 8 ), styrene (C 8 H 8 ), indene (C 9 H 8 ), hexane (C 6 H 14 ), octane (C 8 H 18 ), paraffin oil (C x H y ), naphthalene (C 10 H 8 ), anthracene (C 14 H 10 ), fluorene (C 13 H 10 ), solid paraffin (C x H y ), pyrene (C 16 H 10 ) or polymers, polyethylene (C 2 H 4 )n/polypropylene(C 3 H 6 )n/polystyrene (C 8 H 8 )n which consist of monomers having 2 to 8 carbon atoms, acetylene (C 2 H 2 ), ethylene (C 2 H 4 ), propane (C 3 H 8 ), or methane (CH 4 ),
the doped element is N and the carbon source capable of providing doped element is melamine (C 3 H 6 N 6 ), pyridine (C 5 H 5 N), acrylonitrile (C 3 H 3 N), Pyrrole (C 4 H 5 N), or mixed gas of ammonia (NH 3 ) and hydrocarbon gas,
the doped element is P and the carbon source capable of providing doped element is tributylphosphine ([CH 3 (CH 2 ) 3 ] 3 P) or phosphorine (C 5 H 5 P),
the doped element is B and the carbon source capable of providing doped element is triphenylborane ((C6H5)3B), borinine (C5H5B), triethylborane ((C2H5)3B), trimethylboron (B(CH3)3), or trimethylboron-d9 (B(CD3)3),
the doped element is Li and the carbon source capable of providing doped element is lithium acetylacetonate (LiO 2 C 5 H 7 ), lithium carbonante (Li 2 CO 3 ), lithium sulfide (LiS), lithium hydride (LiH), lithium dimethylamide (Nli(CH 3 ) 2 ), or lithium acetoacetate (LiO 3 C 4 H 5 ),
the doped element is two types or more and the carbon source capable of providing doped element is borane dimethylamine, borane pyridine, borane trimethylamine, borane-ammonia, tetrabutylammonium cyanoborohydride, ammonium tetraphenylborate, tetrabutylammonium borohydride, tetramethylammonium triacetoxyborohydride, 2,4,6-triphenylborazine, or borane diphenylphosphine, or
the waste plastic source is polyethylene, polypropylene, polystyrene, or acrylonitrile butadiene styrene.

5. The method of claim 1 , wherein
the doped element is N and the N doped carbon is any one selected from a group which consists of pyridine type N, pyrrole type N, and quaternary type N.

6. The method of claim 1 , wherein
the waste plastic source is supplied while being mixed with liquid carbon source and doping containing carbon source.

7. The method of claim 1 , wherein
the nanoparticles are metal, a metal oxide, a semiconductor material, or a semiconductor oxide.

8. The method of claim 1 , wherein:
the nanoparticles in the supplying are the metal oxide or semiconductor oxide nanoparticles, and
the metal oxide is reduced to the metal or the semiconductor oxide is reduced to the semiconductor material by further performing hydrogen heat treatment.

9. The method of claim 1 , wherein:
crystallinity of the shell is increased by further performing subsequent heat treatment.

10. The method of claim 1 , wherein:
the shell is functionalized by further performing subsequent coating treatment.

11. The method of claim 1 , wherein:
the plurality of nanoparticle-carbon core-shell structures or the plurality of core-shell structured of the nanoparticle-doped carbon are coated with a carbon layer or a doped carbon layer again to form a carbon shell connection structure having a micron size.

12. The method of claim 1 , wherein:
the nanoparticle-carbon core-shell structure or the core-shell structure of the nanoparticle-doped carbon is synthesized,
a state of the autoclave is made to an atmospheric-pressure and high-temperature state by removing non-reaction gas which remains in the autoclave while reaction is not completed,
hydrogen gas is collected and the gas is removed in the process of removing the non-reaction gas, and
the nanoparticle-carbon core-shell structure or the core-shell structure of the nanoparticle-doped carbon is functionalized while controlling a temperature of the autoclave or supply of reaction gas.

Assignees

• Korea Inst Energy Res

Inventors

• Jeong Namjo
• Kim Chan-Soo
• Choi Ji Yeon
• Nam Joo-Youn
• Park Soon-Chul
• Jang Moon Seok
• Chon Kangmin
• Han Ji-Hyung
• Kim Han-Ki
• Jwa Eun-Jin

Classifications

• B22F1/056

  Submicron particles having a size above 100 nm up to 300 nm · CPC title

• B22F1/00 Primary

  Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties · CPC title

• B22F1/16

  Metallic particles coated with a non-metal (coated with lubricating or binding agents or with organic material B22F1/10) · CPC title

• B22F1/054

  Nanosized particles · CPC title

• B22F9/22

  using gaseous reductors · CPC title