Abstract
In this work, carbon nanotube (CNT) based interconnections and switches will be reviewed, discussing the possibility to use nanotubes as potential building blocks for signal routing in microwave networks. In particular, theoretical design of coplanar waveguide (CPW), micro-strip single-pole-single-throw (SPST) and single-pole-double-throw (SPDT) devices has been performed to predict the electrical performances of CNT-based RF switching configurations. Actually, by using the semiconductor-conductor transition obtained by properly biasing the CNTs, an isolation better than 30 dB can be obtained between the ON and OFF states of the switch for very wide bandwidth applications. This happens owing to the shape deformation and consequent change in the band-gap due to the external pressure caused by the electric field. State-of-art for other switching techniques based on CNTs and their use for RF nano-interconnections is also discussed, together with current issues in measurement techniques.
Highlights
Carbon Nano‐Tubes (CNT) are wires of pure carbon having nanometer diameters and lengths up to many microns
By using the appropriate catalyst, it is possible to improve the nanostructure of Carbon nano‐fibers (CNF) so that their morphology becomes close to multi‐walled carbon nanotube (MWCNT) [10]
Giorgio De Angelis, Andrea Lucibello, Emanuela Proietti, Romolo Marcelli, Daniele Pochesci, Giancarlo Bartolucci, 74 Mircea Dragoman and Daniela Dragoman: Microwave Inter-Connections and Switching by means of Carbon Nano-tubes framework, a tapering of the line could reduce by a factor 10 the linear size of the region where the CNT is present, and by using the same voltage a quadratic effect is obtained on the separation term, obtaining more realistic values for the threshold pressures
Summary
Carbon Nano‐Tubes (CNT) are wires of pure carbon having nanometer diameters and lengths up to many microns. By properly biasing with an electric field the CNT, a transition between two possible states (semiconductor and conductor) could be driven because of the mechanical deformation induced by the pressure exerted by the electrical force due to the bias voltage. Since such a transition can change the conductivity up to six orders of magnitude, CNTs are ideal candidates for molecular electronics technologies. Nano‐wires properly metalized could be used as an alternative solution to the previously described applications They could be oriented under the influence of a magnetic or an electric field, contributing to opening or closing electrical contacts, and realizing the same function for high frequency switching. The nano‐ or micro‐structure has to be properly tailored to be integrated in an electrically matched system
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