engleski

Self-organization of silica nanoparticles induced by the ion beam

We studied the self-organization (SO) of the small-size (D = 90 nm), medium-size (220 nm), and the large-size (450 nm) colloidal silica nanoparticles in Langmuir-Blodgett layers induced by the low energy E = 30 KeV, Ga ion beam. The ion irradiation induces their selforganization (SO) into various types of clusters as the result of particle charging and heating, of the Coulomb repulsion and motion on the substrate surface, but of the particle-particle and the particle-substrate interaction, as well. These processes show a great difference in the underlying dynamics and characteristics of SO pattern, depending on the particle size and the ion fluence. These studies reveal that two dimensional (2D) pattern of the small-size particles is transformed into “infinite” chain-cluster whose complexity decreases with increasing fluence. The pattern of medium-size particles is transformed into short separated chain-clusters showing increasing complexity with increasing fluence. The pattern of large–size particles is mostly unchanged, but shows particle melting and buckling, which at higher fluences passes into sputtering.

nanoparticles; Langmuir-Blodgett layer; ion irradiation; selforganization

Rad je prezentiran na skupu Fourth International Conference on Optical, Optoelectronic and Photonic Materials and Applications (ICOOPMA2010).