Samsung Electronics Co., Ltd.

Hyeon-Jin Shin

Jae-young Choi

Jae-Ho Lee

Kyung-Eun Byun

In-kyeong Yoo

Seon-mi Yoon

David Seo

Hyun-Jae Song

Young-hee Lee

Jai-yong Han

Dong-Wook Lee

Seong-jae Choi

Jae-Young Choi

Seong-Jun Park

Seon-Mi Yoon

Won-Mook Choi

Hyun-Jong Chung

Jin-Seong Heo

Yun-Sung Woo

A single-crystal graphene sheet includes a polycyclic aromatic molecule wherein a plurality of carbon atoms are covalently bound to each other, the single-crystal graphene sheet comprising between about 1 layer to about 300 layers; and wherein a peak ratio of a Raman D band intensity to a Raman G band intensity is equal to or less than 0.2. Also described is a method for preparing a single-crystal graphene sheet, the method includes forming a catalyst layer, which includes a single-crystal graphitizing metal catalyst sheet; disposing a carbonaceous material on the catalyst layer; and heat-treating the catalyst layer and the carbonaceous material in at least one of an inert atmosphere and a reducing atmosphere. Also described is a transparent electrode including a single-crystal graphene sheet.

Single crystalline graphene sheet and process of preparing the same

Provided is a transparent electrode including a graphene sheet. A transparent electrode having high conductivity, low sheet resistance, and low surface roughness can be prepared by employing the graphene sheet.

Transparent electrode comprising graphene sheet, and display and solar cell including the electrode

Provided are a method of preparing a graphene shell and a graphene shell prepared using the method. A first heat treatment is performed on a mixture of an organic solvent and a graphitization catalyst so as to carburize the graphitization catalyst with carbon decomposed from the organic solvent. The graphitization catalyst is in the form of particles. A second heat treatment process is performed on the carburized graphitization catalyst in an inert or reductive gas atmosphere to thereby form graphene shells on surfaces of the carburized graphitization catalyst.

Method of preparing graphene shell and graphene shell prepared using the method

Provided is a method of modifying carbon nanotubes, the method including: preparing a mixed solution in which a radical initiator and a carbon nanotube are dispersed; applying energy to the mixed solution to decompose the radical initiator into a radical; and reacting the decomposed radical with a surface of the carbon nanotube, wherein the radical which has reacted with the carbon nanotube is detached from the carbon nanotube after the reaction with the carbon nanotube. In the method of modifying carbon nanotube, a radical is reacted with a carbon nanotube and then separated from the carbon nanotube to thus modify the surface of the carbon nanotube without chemical bonding. Accordingly, the conductivity of the carbon nanotube can be increased.

Method of modifying carbon nanotube using radical initiator, and dispersion liquid and electrode comprising the carbon nanotube modified by using the method

An economical method of preparing a large-sized graphene sheet having a desired thickness includes forming a film, the film comprising a graphitizing catalyst; heat-treating a gaseous carbon source in the presence of the graphitizing catalyst to form graphene; and cooling the graphene to form a graphene sheet. A graphene sheet prepared according to the disclosed method is also described.

Graphene sheet and method of preparing the same

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Yongin-si, South Korea

Hyeon-Jin Shin