The aim of the current proposal, which is on the framework of an ILL Ph.D. project is to characterise the interactions (covalent or non-covalent) between carbon nanotubes (CNTs) and model molecules (fluorophores), aiming at answering the following fundamental questions: (i) What are the adsorption sites in CNTs samples (different surface sites are available)(ii) What is the ratio between covalent and adsorbed molecules in the case of a covalent grafting?In order to answer these questions it is necessary to probe the stretching region of our samples with neutrons in order to "highlight" the organic molecules at the surface of the CNTs. After previous inelastic neutron scattering experiments performed at the ILL, we know that the use of a direct geometry spectrometer such as MAPS is required for the measurement accuracy we are looking for.