Abstract: Catalysts for hydrogen evolution reaction (HER) and method of forming the catalysts are provided. The catalysts may include a metal chalcogenide film comprising chalcogen atom vacancies. A density of the chalcogen atom vacancies may be from about 5% to about 15%. The catalysts may further include a substrate on which the metal chalcogenide film extends. The substrate may include nickel, titanium, silver, zinc, and/or platinum. The catalysts may also include hydrogen ions disposed a surface of the metal chalcogenide film. The metal chalcogenide film may be a monolayer film including dopants, and the dopants may be nickel atoms, cobalt atoms, zinc atoms, iron atoms, rhenium (Re) atoms, and/or Niobium (Nb) atoms.

Abstract: Ferromagnetic semiconductor layers and methods of forming the same are provided. Electronic devices including the ferromagnetic semiconductor layer are also provided. The ferromagnetic semiconductor layer may include an atomically thin transition metal dichalcogenide layer. The atomically thin transition metal dichalcogenide layer may include dopant metal atoms therein.

Abstract: Provided herein are methods of electrically controlling photons using an atomically thin transition metal dichalcogenide layer. Further, provided are photonic devices and tunable waveguides including a transition metal dichalcogenide layer. The methods may include applying an electrical field to the transition metal dichalcogenide layer. The photonic devices and tunable waveguides may further include a first electrode, a second electrode, and an insulation layer. The insulation layer may extend between the first electrode and the transition metal dichalcogenide layer thereby electrically isolating the first electrode from the transition metal dichalcogenide layer.

Abstract: Patterning planar photo-absorbing materials into arrays of nanowires is demonstrated as a method for increasing the total photon absorption in a given thickness of absorbing material. Such a method can provide faster, cheaper, and more efficient photo-detectors and solar cells. A thin nanowire can absorb many more photons than expected from the size of the nanowire. The reason for this effect is that such nanowires support cylindrical particle resonances which can collect photons from an area larger than the physical cross-section of the wire. These resonances are sometimes referred to as Mie resonances or Leaky Mode Resonances (LMRs). The nanowires can have various cross section shapes, such as square, circle, rectangle, triangle, etc.

Abstract: The present disclosure relates to nanosheet synthesis. More particularly, the present disclosure relates to molybdenum sulfide (MoS2) atomic thin films and hydrogen evolution reactions. In one or more embodiments, a synthesis process may include sublimation of sulfur and MoCl5, reaction of MoCl5 and S to produce gaseous MoS2 species, transfer of the MoS2 species by carrier gas, diffusion of MoS2 species from the gas phase onto receiving substrates, and precipitation of MoS2 on the substrates.

Abstract: Patterning planar photo-absorbing materials into arrays of nanowires is demonstrated as a method for increasing the total photon absorption in a given thickness of absorbing material. Such a method can provide faster, cheaper, and more efficient photo-detectors and solar cells. A thin nanowire can absorb many more photons than expected from the size of the nanowire. The reason for this effect is that such nanowires support cylindrical particle resonances which can collect photons from an area larger than the physical cross-section of the wire. These resonances are sometimes referred to as Mie resonances or Leaky Mode Resonances (LMRs). The nanowires can have various cross section shapes, such as square, circle, rectangle, triangle, etc.

Abstract: The present disclosure relates to nanosheet synthesis. More particularly, the present disclosure relates to molybdenum sulfide (MoS2) atomic thin films and hydrogen evolution reactions. In one or more embodiments, a synthesis process may include sublimation of sulfur and MoCl5, reaction of MoCl5 and S to produce gaseous MoS2 species, transfer of the MoS2 species by carrier gas, diffusion of MoS2 species from the gas phase onto receiving substrates, and precipitation of MoS2 on the substrates.

Abstract: Patterning planar photo-absorbing materials into arrays of nanowires is demonstrated as a method for increasing the total photon absorption in a given thickness of absorbing material. Such a method can provide faster, cheaper, and more efficient photo-detectors and solar cells. A thin nanowire can absorb many more photons than expected from the size of the nanowire. The reason for this effect is that such nanowires support cylindrical particle resonances which can collect photons from an area larger than the physical cross-section of the wire. These resonances are sometimes referred to as Mie resonances or Leaky Mode Resonances (LMRs). The nanowires can have various cross section shapes, such as square, circle, rectangle, triangle, etc.