Solvothermal synthesis and AFM characterization of TiSe2 two-dimensional sheets

GUSTAVO M. MORALES; ÁLVARO J. ROSA

Ciudad Autónoma de Buenos Aires

Simposio; 2º SIMPOSIO DE NANOMATERIALES 2D - 2ND SYMPOSIUM OF 2D NANOMATERIALS; 2020

Universidad Tecnológica Nacional Facultad Regional Buenos Aires

There are many Van der Waals solids that can be isolated into two-dimensional (2D) sheets. Since the isolation of graphene in 2004 by graphite exfoliation, the synthesis and characterization of these new materials have increased notably due to their exceptional physical properties, which is leading to great advances in different areas of science and technology. This work presents the solvothermal synthesis in hydrazine of 2D titanium diselenide (TiSe2) sheets and its subsequent characterization by Atomic Force Microscopy (AFM). The synthesis process is carried out from TiSe2 crystals, and treating a dispersion of them in a hydrazine at 180°C during three hours under pressure. The interaction between hydrazine and selenium atoms seems to be enough to overcome the van der Waals forces that hold the crystal together, producing exfoliation in single or few-layer sheets. AFM measurements show that sheets of (0.60 ± 0.08) nm thick are obtained, which is consistent with previous reports of TiSe2 monolayers. https://youtu.be/kMW144xwTqk