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Evènements et manifestations

18/06/2014

Doctorate thesis defense of Ibtissem OUERIEMI



Doctorate thesis defense on Friday June 18 th, 2014 at 9h00, Amphi 2 at Sup'Com


Entitled : Study the potential of conductive inks based on carbon nanotubes in microwave range: Characterization and contribution to passive electronic components

Presented by : Ibtissem OUERIEMI 



Committee


President

Ridha BOULLEGUE

Professor, Sup’Com – Tunisia.

 

 

 

Examiners

Henri HAPPY

Professor, University of Lille - IEMN – France.

 

Ali GUARSALLAH

Professor, FST– Tunisia.

 

Hichem TRABELSSI

Professor, ESTI – Tunisie.

 

Thesis Directors

Fethi CHOUBANI

Professor, Sup’Com – Tunisia.

 

Jean-Pierre RASKIN

Professor, University Catholique Louvain- UCL-Belgium

 

Isabelle HUYNEN

Professor, University Catholique Louvain UCL-Belgium


Abstract


Nano-materials and Nanotechnologies are links to achieve the basic features of future generations. Carbon nanotubes have attracted significant attention from the scientific community thanks to their nono-size and their amazing mechanical, thermal and electrical properties. They are available in powder and in dispersions which expand the range of applications such as electronic devices. In this thesis, the characterization and wideband electrical properties of the conductive Ink based MWCNTs are investigated. There is a great interest in testing its contribution for electronic components. CNTs are characterized through Raman spectroscopy, microscopic observations (SEM and TEM) and sheet resistivity measurements. The electrical characterization is the key to understand the transport phenomenon through CNTs networks. IV and RF characteristics as a function of static bias were performed. These experimental results clearly demonstrate the non-linear behaviour of the MWCNTs film. This non linearity is successfully explained by a proper interconnection of semi-conductor/metallic junctions occurring in the CNTs network. Furthermore, equivalent circuits of studied electronic devices based CNTs films are proposed and validated over a wide frequency band (from 10 MHz up to 26.5 GHz). This leads to a better understanding of their behavior and thus; exploits their real contribution in new potential applications. Deposition method of CNTs networks, can yield a range of network morphology. In this study, two deposition methods were used; by means of micropipette and by inkjet printing. This study is considered as an experimental demonstration of the potential MWCNT film. The mode propagation in integrated circuits covered by inkjet printing CNTs films is investigated, when an important slow-wave property is clearly indicated at low-frequencies. Furthermore, the obtained experimental results obviously demonstrated the outstanding contribution for electronic components as sensor and filter applications. Sensing properties of random networks are tested by varying the humidity in the environment. Additionally, carbon nanotubes based CPW line performs as a low-pass filter.


Keywords

Carbon nanotubes, characterization, conductive ink, I-V characteristics, modeling, Inkjet printing process, nonlinear characteristics, RF measurements, slow-wave.