New carbon cone nanotip for use in a highly coherent cold field emission electron microscope

Abstract : A new cathode for cold-field emission gun using a pyrolytic carbon-cone supported onto a carbon nanotube as the electron emitting tip has been developped. This tip was mounted in a TEM using a FIB based method, and the brightness measured under real operating conditions is 5 times better than obtained with a standard tungsten tip. Its use overcomes the many technical difficulties which have dogged the use of carbon nanotube-based tips as proposed replacements for tungsten tips. The resulting properties of the final CFEG exhibit a very good energy spread of 0.32eV, a reduced brightness of 1.6×10⁹ A.m⁻².sr⁻¹.V⁻¹ and a very good long-term stability with a current damping less than 16% per hour.
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Carbon, Elsevier, 2012, 50 (5), pp.2037-2044. 〈10.1016/j.carbon.2012.01.023〉
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F. Houdellier, Aurélien Masseboeuf, M. Monthioux, M. J. Hÿtch. New carbon cone nanotip for use in a highly coherent cold field emission electron microscope. Carbon, Elsevier, 2012, 50 (5), pp.2037-2044. 〈10.1016/j.carbon.2012.01.023〉. 〈hal-00678407〉

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