Seminar Announcement: Plinio Innocenzi

Data pubblicazione: 22-apr-2022

Announcement

Wednesday, 1 June 2022, 15:30

Sala Grande Palazzina B via alla Cascata 56/C

"Boron Nitride Nanomaterials, controlling the optical properties through defects"

Prof. Plinio Innocenzi

Laboratory of Materials Science and Nanotechnology

University of Sassari

E-mail: plinio@uniss.it

Abstract

Hexagonal boron nitride (h-BN), which has a layered structure similar to graphene, has attracted much attention because of its unique combination of properties. h-BN can be formed in a large variety of different nanostructures from 3D to 0D, such as 2D layers, nanoribbons, nanotubes, dots, nanocages and fullerene-like molecules. In particular, h-BN can be easily exfoliated from bulk crystals down to a few layers. h-BN nanosheets have been obtained by developing both top-down and bottom-up routes even if controlling the number of layers, their dimension and the formation of defects remains a technological challenge. Most of the functional properties of h-BN in the 2D form depend on the presence of defects, which can be of different nature. Controlling defects is, therefore, mandatory for engineering the functional properties of h-BN materials, from 0D to 2D dimensions. Some examples of defect-structure-properties relationship will be presented for h-BN dots and 2D nanosheets. Structural defects, already present after synthesis, can have an unpredictable trend in post-synthesis treatment conditions. In this scenario, the understanding of the effects of temperature and the impurities that originated in the growth process becomes of fundamental importance for the enhancement of luminescence caused by point defects.