Heterogeneous deformation of two-dimensional materials for emerging functionalities

Abstract

Abstract

Periodic Spiral Ripples on VS2 Flakes: A Tip-Enhanced Raman Investigation

“…Furthermore, a rapid growth of small crystals is induced by the roughness of the mica substrate in combination with the high feeding rate of the chalcogen (S). 18,19 The change in sulfur introduction time and local temperature, induced by repositioning of the furnace, shifts the equilibrium of the reaction. This, in combination with a thermal expansion mismatch between the VS 2 and the mica substrate, causes the formation of wrinkles and has been previously observed in graphene.…”

“…Furthermore, a rapid growth of small crystals is induced by the roughness of the mica substrate in combination with the high feeding rate of the chalcogen (S). , The change in sulfur introduction time and local temperature, induced by repositioning of the furnace, shifts the equilibrium of the reaction. This, in combination with a thermal expansion mismatch between the VS 2 and the mica substrate, causes the formation of wrinkles and has been previously observed in graphene. − In these studies, a strain was formed during the cooling period, which was large enough to generate buckles over the flake. The indicated periodicity has also been found in heterostructure TMDs with specific torsion growth such as WS 2 /WSe 2 …”

Periodic arrays of structurally complex oxide nanoshells and their use as substrate-confined nanoreactors

“…67,68 Vertically standing half-shells and shape-controlled rings could find utility as topographical features that serve as (i) trapping sites for colloidal structures in directed assembly processes, 48,69 (ii) obstacles to nanostructure growth fronts that define nanogaps between adjacent structures, 41 and (iii) supports onto which two-dimensional materials are overlayed to realize contours that locally alter electronic, photonic, and mechanical properties. [70][71][72][73] Taken together, these oxide structures have the potential to act as a unique platform for advancing the capabilities of substrate-based nanomaterials.…”

Strain Engineering of Low‐Dimensional Materials for Emerging Quantum Phenomena and Functionalities

“…These low-dimensional quantum materials not only exhibited novel quantum phenomena emerging from nanoscale quantum confinement, but also enabled strain engineering with improved efficiency and versatility due to the outstanding mechanical resilience and strain sensitivity of low-dimensional materials, unlike their bulk counterparts that experience catastrophic fracture. [17][18][19] The extraordinary mechanical properties of low-dimensional materials are epitomized by atomically thin van der Waals materials, such as graphene and transition metal dichalcogenides (TMDs), which possess ultrahigh in-plane fracture strengths and Young's moduli as well as ultralow out-of-plane bending stiffnesses comparable to biological membranes. [20,21] Additionally, modern advances in nanocharacterization technologies, including tip-enhanced near-field spectroscopy (TERS) and 4D scanning transmission electron microscopy (4D-STEM), have played a pivotal role in multiscale elucidation of strain effects on quantum phenomena.…”