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나노 구조 물리 연구단
나노구조물리 연구단
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Chemically doped three-dimensional porous graphene monoliths for high-performance flexible filed emitters

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Title
Chemically doped three-dimensional porous graphene monoliths for high-performance flexible filed emitters
Author(s)
Ho Young Kim; Sooyeon Jeong; Seung Yol Jeong; Kang-Jun Baeg; Joong Tark Han; Mun Seok Jeong; Geon-Woong Lee; Hee Jin Jeong
Publication Date
2015-03
Journal
NANOSCALE, v.7, no.12, pp.5495 - 5502
Publisher
ROYAL SOC CHEMISTRY
Abstract
Despite the recent progress in the fabrication of field emitters based on graphene nanosheets, their morphological and electrical properties, which affect their degree of field enhancement as well as the electron tunnelling barrier height, should be controlled to allow for better field-emission properties. Here we report a method that allows the synthesis of graphene-based emitters with a high field-enhancement factor and a low work function. The method involves forming monolithic three-dimensional (3D) graphene structures by freeze-drying of a highly concentrated graphene paste and subsequent work-function engineering by chemical doping. Graphene structures with vertically aligned edges were successfully fabricated by the freeze-drying process. Furthermore, their number density could be controlled by varying the composition of the graphene paste. Al- and Au-doped 3D graphene emitters were fabricated by introducing the corresponding dopant solutions into the graphene sheets. The resulting field-emission characteristics of the resulting emitters are discussed. The synthesized 3D graphene emitters were highly flexible, maintaining their field-emission properties even when bent at large angles. This is attributed to the high crystallinity and emitter density and good chemical stability of the 3D graphene emitters, as well as to the strong interactions between the 3D graphene emitters and the substrate.
URI
https://pr.ibs.re.kr/handle/8788114/2074
ISSN
2040-3364
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
Files in This Item:
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