Structuration οf SrΤiΟ3 surfaces and ΜοS2 2D material induced by swift heavy ion irradiation at grazing incidence

Overview & Synopsis

Material modification has enabled significant advancements in the technological fields by allowing for precise control and manipulation of material properties. To ensure successful applications, it is crucial to have techniques that offer control over the size, shape, and morphology of the structures created. This thesis explores the use of swift heavy ions (SHI) to create nano- and microstructures on the surfaces of strontium titanate (SrTiO3) and molybdenum disulphide (MoS2) under grazing incidence geometry. The results show that SHI irradiation can induce various surface modifications, such as elongated surface defects, wave-like tructures, and amorphization. This research demonstrates that by adjusting the fluence and angle of incidence of the ion beam, periodic wavelike structures can be formed on the surface of SrTiO3. These structures can be deepened to obtain a more pronounced valley, which can be used to directly grow two-dimensional materials and obtain heterostructures with well-defined interfaces. The results also demonstrate that SHI irradiation can induce folding in MoS2 samples. The angle of incidence of the ion beam and the substrate used can control the defects. The choice of substrate can also influence fold density and length. It is shown that using SrTiO3 as a substrate allows folding with variable lengths without the need for specific crystallographic orientation conditions.