Layer-Dependent Gas Sensing Mechanism of 2D Titanium Carbide (TiCT) MXene.

Monolayers of TiCT MXene and bilayer structures formed by partially overlapping monolayer flakes exhibit opposite sensing responses to a large scope of molecular analytes. When exposed to reducing analytes, monolayer MXene flakes show increased electrical conductivity, i.e.

Effect of Au/HfS interfacial interactions on properties of HfS-based devices.

X-ray photoemission spectroscopy (XPS) has been used to examine the interaction between Au and HfS at the Au/HfS interface. XPS measurements reveal dissociative chemisorption of O, leading to the formation of an oxide of Hf at the surface of HfS. This surface hafnium oxide, along with the weakly chemisorbed molecular species, such as O and HO, are likely responsible for the observed p-type characteristics of HfS reported elsewhere.

Quasi-1D TiS Nanoribbons: Mechanical Exfoliation and Thickness-Dependent Raman Spectroscopy.

Quasi-one-dimensional (quasi-1D) materials enjoy growing interest due to their unusual physical properties and promise for miniature electronic devices. However, the mechanical exfoliation of quasi-1D materials into thin flakes and nanoribbons received considerably less attention from researchers than the exfoliation of conventional layered crystals. In this study, we investigated the micromechanical exfoliation of representative quasi-1D crystals, TiS whiskers, and demonstrate that they typically split into narrow nanoribbons with very smooth, straight edges and clear signatures of 1D TiS chains.