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Title: Efficient field emission from α- Fe2 O3 nanoflakes on an atomic force microscope tip
Authors: Zhu, Y.W. 
Yu, T. 
Sow, C.H. 
Liu, Y.J. 
Wee, A.T.S. 
Xu, X.J. 
Lim, C.T. 
Thong, J.T.L. 
Issue Date: 11-Jul-2005
Source: Zhu, Y.W., Yu, T., Sow, C.H., Liu, Y.J., Wee, A.T.S., Xu, X.J., Lim, C.T., Thong, J.T.L. (2005-07-11). Efficient field emission from α- Fe2 O3 nanoflakes on an atomic force microscope tip. Applied Physics Letters 87 (2) : -. ScholarBank@NUS Repository.
Abstract: Aligned arrays of flake-shaped hematite (α- Fe2 O3) nanostructure have been fabricated on an atomic force microscope (AFM) tip. They are created by simply heating an iron-coated AFM tip in ambience on a hot plate. These nanoflakes are characterized as α- Fe2 O3 single crystalline structures with tip radii as small as several nanometers and are highly effective as electron field emitters. With a vacuum gap of about 150 μm, field emission measurements of α- Fe2 O3 nanoflakes on AFM tips show a low turn-on voltage of about 400-600 V and a high current density of 1.6 A cm-2 under 900 V. Such high emission current density is attributed to the nanoscale sharp tips of the as-grown nanoflakes. Based on the Fowler-Nordheim theory, it is demonstrated the enhancement factor of α- Fe2 O3 nanoflakes on AFM tips is comparable to that of carbon nanotubes. Our findings suggest that α- Fe2 O3 nanoflakes are potentially useful as candidates for future electron field emission devices. © 2005 American Institute of Physics.
Source Title: Applied Physics Letters
ISSN: 00036951
DOI: 10.1063/1.1991978
Appears in Collections:Staff Publications

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