Département de chimie moléculaire

Carbon nanotube-chromophore hybrids are promising building blocks in order to obtain a controlled electro-optical transduction effect at the single nano-object level. In this work, a strong spectral selectivity of the electronic and the phononic response of a chromophore-coated single nanotube transistor is obsd. for which std. photogating cannot account. This paper investigates how light irradn. strongly modifies the coupling between mols. and nanotube within the hybrid by means of combined Raman diffusion and electron transport measurements. Moreover, a nonconventional Raman enhancement effect is obsd. when light irradn. is on the absorption range of the grafted mol. Finally, this paper shows how the dynamics of single electron tunneling in the device at low temp. is strongly modified by mol. photoexcitation. Both effects will be discussed in terms of photoinduced excitons coupled to electronic levels. [on SciFinder(R)]