Structural changes of electron and ion beam-deposited contacts in annealed carbon-based electrical devices
AuthorsBatra, Nitin M
Patole, Shashikant P.
Anjum, Dalaver H.
Deepak, Francis L
Da Costa, Pedro M. F. J.
KAUST DepartmentElectron Microscopy
Imaging and Characterization Core Lab
Material Science and Engineering Program
Physical Science and Engineering (PSE) Division
Online Publication Date2015-10-09
Print Publication Date2015-11-06
Permanent link to this recordhttp://hdl.handle.net/10754/580007
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AbstractThe use of electron and ion beam deposition to make devices containing discrete nanostructures as interconnectors is a well-known nanofabrication process. Classically, one-dimensional materials such as carbon nanotubes (CNTs) have been electrically characterized by resorting to these beam deposition methods. While much attention has been given to the interconnectors, less is known about the contacting electrodes (or leads). In particular, the structure and chemistry of the electrode–interconnector interface is a topic that deserves more attention, as it is critical to understand the device behavior. Here, the structure and chemistry of Pt electrodes, deposited either with electron or ion beams and contacted to a CNT, are analyzed before and after thermally annealing the device in a vacuum. Free-standing Pt nanorods, acting as beam-deposited electrode models, are also characterized pre- and post-annealing. Overall, the as-deposited leads contain a non-negligible amount of amorphous carbon that is consolidated, upon heating, as a partially graphitized outer shell enveloping a Pt core. This observation raises pertinent questions regarding the definition of electrode–nanostructure interfaces in electrical devices, in particular long-standing assumptions of metal-CNT contacts fabricated by direct beam deposition methods.
CitationStructural changes of electron and ion beam-deposited contacts in annealed carbon-based electrical devices 2015, 26 (44):445301 Nanotechnology
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