tellurium and molybdenum-telluride

Two-dimensional (2D) transition-metal dichalcogenides have become promising candidates for surface-enhanced Raman spectroscopy (SERS), but currently very few examples of detection of relevant molecules are available. Herein, we show the detection of the lipophilic disease marker β-sitosterol on few-layered MoTe

Topics: Density Functional Theory; Molybdenum; Particle Size; Sitosterols; Spectrum Analysis, Raman; Surface Properties; Tellurium

The quest for a suitable material with the potential of capturing toxic nitrogen-containing gases (NH

Topics: Adsorption; Ammonia; Antimony; Density Functional Theory; Gases; Germanium; Models, Chemical; Molybdenum; Nitric Oxide; Nitrogen Dioxide; Selenium Compounds; Tellurium

The unique properties of two-dimensional (2D) materials make them promising candidates for chemical and biological sensing applications. However, most 2D material sensors suffer from extremely long recovery time due to the slow molecular desorption at room temperature. Here, we report an ultrasensitive p-type molybdenum ditelluride (MoTe

Topics: Electrochemical Techniques; Gases; Limit of Detection; Molybdenum; Nitrogen Dioxide; Tellurium; Ultraviolet Rays

Transition metal dichalcogenides have attracted research interest over the last few decades due to their interesting structural chemistry, unusual electronic properties, rich intercalation chemistry and wide spectrum of potential applications. Despite the fact that the majority of related research focuses on semiconducting transition-metal dichalcogenides (for example, MoS2), recently discovered unexpected properties of WTe2 are provoking strong interest in semimetallic transition metal dichalcogenides featuring large magnetoresistance, pressure-driven superconductivity and Weyl semimetal states. We investigate the sister compound of WTe2, MoTe2, predicted to be a Weyl semimetal and a quantum spin Hall insulator in bulk and monolayer form, respectively. We find that bulk MoTe2 exhibits superconductivity with a transition temperature of 0.10 K. Application of external pressure dramatically enhances the transition temperature up to maximum value of 8.2 K at 11.7 GPa. The observed dome-shaped superconductivity phase diagram provides insights into the interplay between superconductivity and topological physics.

Topics: Electric Conductivity; Electronics; Electrons; Molybdenum; Pressure; Quantum Theory; Superconductivity; Tellurium; Transition Temperature

The structural, electronic, and mechanical properties of single-walled MoTe(2) nanotubes are investigated using density functional theory. All large-diameter MoTe(2) nanotubes are found to be narrow-gap semiconductors, whereas small-diameter nanotubes are found to be less stable compared to large-diameter nanotubes. Notably, the armchair MoTe(2) nanotubes exhibit an indirect band gap, whereas the zigzag nanotubes exhibit a direct band gap. The band gap decreases with decreasing diameter of the tube or if the tube is under compression or elongation in the axial direction. Young's modulus of MoTe(2) nanotubes is calculated and is found to be dependent on the diameter and chirality of the tubes. The armchair nanotubes are stiffer than the zigzag nanotubes with the same diameter. Compared to the homologous MoTe(2) nanotubes, the MoTe(2) nanotubes are softer due to less strain-energy cost in forming the nanotube structures.

Topics: Computer Simulation; Crystallization; Elasticity; Electric Impedance; Macromolecular Substances; Materials Testing; Models, Chemical; Models, Molecular; Molecular Conformation; Molybdenum; Nanostructures; Nanotechnology; Particle Size; Stress, Mechanical; Surface Properties; Tellurium

Scanning tunnelling microscopy was used to image biological molecules including supercoiled deoxyribonacetic acid and specific retrovirus enzymes, the reverse transcriptases of the avian myeloblastosis virus, the moloney murine leukaemia virus and the human immunodeficiency virus. Measurements were carried out on graphite and Group VI transition metal dichalcogenide layered crystals. Images obtained with graphite could not be unequivocally interpreted and attachment appears to occur solely at surface defect sites. The layered crystal MoTe2 shows different imaging properties. The bimolecules are clearly visible, distributed over the semiconductor surface, and the molecular shapes and dimensions show good correlation with structure predictions.

Topics: DNA, Superhelical; Microscopy, Scanning Tunneling; Molybdenum; Retroviridae; RNA-Directed DNA Polymerase; Tellurium