To get more insight on the chemical nature of the nanostructures,EELS spectra were acquired on the flakes and nanoparticles of G1.0/450 (Fig. 2). The EELS spectrum acquired on the nanoparticles shows the presence of Ti–L2,3 and O–K edges located around 457 and 530 eV,respectively. On the other hand, the spectrum acquired on the flake shows only the presence of the C–K edge around 285 eV. It should be noted that no other edges, related in particular to oxygen or nitrogen,can be highlighted on the probed energy range. In addition, the C–Kedge clearly shows fine-structure characteristics of a highly graphitic carbon [62]. These results show that the hybrid nanostructure is nanoparticles [62]. Similar results concerning imaging and spectroscopic analyses were obtained on G1.0/250.