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Self‐Organized Graphene Nanosheets with Corrugated, Ordered Tip Structures for High‐Performance Flexible Field Emission
Author(s) -
Jeong Hee Jin,
Jeong Hae Deuk,
Kim Ho Young,
Jeong Seung Yol,
Han Joong Tark,
Lee GeonWoong
Publication year - 2013
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201202143
Subject(s) - graphene , materials science , field electron emission , nanotechnology , substrate (aquarium) , oxide , fabrication , crystallinity , bending , chemical engineering , composite material , medicine , oceanography , physics , alternative medicine , pathology , quantum mechanics , geology , engineering , metallurgy , electron
Patterned reduced graphene oxide (rGO) films with vertically aligned tip structures are fabricated by a straightforward self‐assembly method. The size, uniformity of the patterns, and alignment of the tips are successfully controlled according to the concentration of a GO/octadecylamine (ODA)‐dispersed solution. The surface energy difference between the GO/ODA solution and a self‐assembled water droplet is a critical parameter for determining the pattern structure. Numerous rGO nanosheets are formed so as to be vertically aligned with respect to the substrate during film fabrication at GO concentrations below 2.0 g/L. These samples provide high field‐emission characteristics. The patterned rGO arrays are highly flexible with preservation of the field emission properties, even at large bending angles. This is attributed to the high crystallinity, emitter density, and good chemical stability of the rGO arrays, as well as the strong interactions between the rGO arrays and the substrate.