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Soutenance de thèse

Mercredi 20 janvier à 10h30,
Salle des séminaires, Bât A

Orateur : Yani Chen
"Hybrid carbon based devices : functionalization of nanotube and graphene devices with active molecules"


In the frame of the intense research on electronics beyond CMOS, molecular electronics offers the versatility of organic chemistry in order to tailor new functions combining optical and electronic specifications, while accessing the quantum confined regime intrinsic to small molecules. As1D conductors, carbon nanotubes bridg e the gap between small molecules electronics and semiconductor technology with great promises while being a playground for organic chemistry. Beyond miniaturization, they offer the opportunity to design new devices from accurate sensors to optoelectronic and quantum devices. However most studies focus on sensor or photovoltaic applications and thus involve a macroscopic assembly of nanotubes. This averages the excitation transfers, which prevents access to their fundamental mechanisms. This requires the design of individual carbon nanotube based functional devices. For this issue double wall carbon nanotubes have many advantages over simple SWNTs. In general, they exhibit higher stability, which can be a substantial help in high-current and high-field experiments. They realize a core-shell system : their concentric structure suggests its use for independent doping or functionalization of inner and outer tubes. In this PhD project, we demonstrate field effect transistors based on hybrid systems of individual double wall carbon nanotubes and optically sensitive molecule. We first introduce the method for making individual double wall carbon nanotube field effect transistors (DWNT FETs), which are then characterized both optically and electrically. We also studied the electron phonon coupling in the DWNT system by Raman spectroscopy with electrostatic gating. The inner metallic tube is also affected by the electrostatic gate and shows dramatic changes of the overall Raman signature. We then functionalized non covalently two kinds of optically sensitive molecules to DWNT and graphene FETs (Terpyridine Osmium complex and Zinc(II) metalloporphyrin). The hybrids are characterized both optically and electrically. Charge transfer between DWNTs and molecules plays as a chemical gating which can be detected by Raman spectroscopy as well as electrical transport measurements, which indicates that the D WNT FETs can be utilized for molecular sensing. Light excitation of the molecules leads to doping of the hybrids and reveals the coupling between the nanotube walls. Moreover, we realized wavelength dependent optical gating on the hybrid device, detected by both Raman spectroscopy and electrical transport measurements at both room temperature and helium temperature. The optical control of the hybrids’ electronic behavior will be elucidated in terms of photo-induced charge transfer between the grafted molecules and the DWNT component. As a consequence, this hybrid FETs can be used as an optically controlled memory down to single electron transfers at low temperature.

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