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Author

Kim, Kwanpyo
Experimental Nanoscale Physics Lab
Research Interests
  • Two-dimensional (2D) materials, graphene, NEMS, electron microscopy

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Selective metal deposition at graphene line defects by atomic layer deposition

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Title
Selective metal deposition at graphene line defects by atomic layer deposition
Author
Kim, KwanpyoLee, Han-Bo-RamJohnson, Richard W.Tanskanen, Jukka T.Liu, NanKim, Myung-GilPang, ChanghyunAhn, ChiyuiBent, Stacey F.Bao, Zhenan
Keywords
CHEMICAL-VAPOR-DEPOSITION; TOTAL-ENERGY CALCULATIONS; WALLED CARBON NANOTUBES; HIGH-KAPPA DIELECTRICS; GAUSSIAN-BASIS SETS; WAVE BASIS-SET; GRAIN-BOUNDARIES; POLYCRYSTALLINE GRAPHENE; LARGE-AREA; TRANSPARENT ELECTRODES
Issue Date
201409
Publisher
NATURE PUBLISHING GROUP
Citation
NATURE COMMUNICATIONS, v.5, no., pp.1 - 9
Abstract
One-dimensional defects in graphene have a strong influence on its physical properties, such as electrical charge transport and mechanical strength. With enhanced chemical reactivity, such defects may also allow us to selectively functionalize the material and systematically tune the properties of graphene. Here we demonstrate the selective deposition of metal at chemical vapour deposited graphene's line defects, notably grain boundaries, by atomic layer deposition. Atomic layer deposition allows us to deposit Pt predominantly on graphene's grain boundaries, folds and cracks due to the enhanced chemical reactivity of these line defects, which is directly confirmed by transmission electron microscopy imaging. The selective functionalization of graphene defect sites, together with the nanowire morphology of deposited Pt, yields a superior platform for sensing applications. Using Pt-graphene hybrid structures, we demonstrate high-performance hydrogen gas sensors at room temperature and show its advantages over other evaporative Pt deposition methods, in which Pt decorates the graphene surface non-selectively. ⓒ 2014 Macmillan Publishers Limited. All rights reserved
URI
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DOI
http://dx.doi.org/10.1038/ncomms5781
ISSN
2041-1723
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