3 results about "Spin filtering" patented technology

The invention provides a CrBr3-based spin filtering magnetic tunnel junction, and belongs to the technical field of spin electronic devices. Two two-dimensional Van der Waals layered materials are adopted for construction, and the specific structure is that metallic 1T-phase multi-layer MoSe2 serves as a non-magnetic NM electrode, semiconductor double-layer CrBr3 serves as a tunnel magnetic barrier layer, and a symmetric sandwich structure of MoSe2 / double-layer CrBr3 / MoSe2 is formed; the lattice matching of the electrode and the barrier layer is realized through a cell expansion stacking design, and the interlayer magnetic coupling state of the double-layer CrBr3 is regulated and controlled through an external magnetic field; the semimetallic property of CrBr3 is induced by utilizing an interface charge transfer effect to form a'spin filter ', so that electrons are freely transported only in a PC state in a spin direction. The MoSe2 / double-layer CrBr3 / MoSe2 sf-MTJ designed by the invention has good application potential in the field of high-speed, low-power-consumption and miniaturized spinning electronic devices.

The invention relates to the technical field of catalysts, in particular to a chiral-metal defect coupling catalyst, a preparation method and application thereof and a preparation method of fuel. The chiral structure and the metal defect structure are coupled and synergistically constructed in the same metal oxide catalyst, so that the chiral-metal defect coupled catalyst has the advantages of the chiral structure and the metal defect structure, and shows excellent catalytic performance in photocatalytic reaction. Wherein the metal defect structure can regulate and control the energy band structure of the metal oxide, improve the visible light absorption capacity, promote the electron-hole separation efficiency and improve the spin photocatalytic reaction activity. A chiral spinning structure can generate a CISS effect, electron-hole recombination is further inhibited, the service life of a carrier is prolonged, a spinning triplet-state reaction intermediate is formed through a spinning filtering effect in a photocatalytic synthesis fuel reaction so as to improve the reaction rate, the fuel substrate conversion rate and the fuel selectivity, and the chiral spinning structure is especially suitable for photocatalytic synthesis of high-density fuel and has a wide application prospect. And the prepared fuel meets the requirements of aerospace.

This invention provides a visible light responsive titanium dioxide photocatalyst, its preparation method, and its application. The photocatalyst has a core-shell structure or a heterojunction interface structure and includes the following components: matrix material: modified nano-titanium dioxide; modifying material: chiral carbon quantum dots; the chiral carbon quantum dots are grown in situ or grafted onto the surface of the matrix material through Ti-O-C chemical bonds or strong electrostatic interactions; the photocatalyst utilizes the spin filtering effect generated by the CISS effect of the chiral carbon quantum dots, so that the photogenerated electrons injected into the matrix and the remaining holes are in a spin-forbidden state, thereby inhibiting recombination; this invention uses physical laws rather than simple energy level matching to inhibit recombination, significantly improving the quantum efficiency; the long-lived electrons and holes can continuously generate active free radicals, effectively overcoming the difficult-to-degrade VOCs containing benzene ring structures such as toluene, and reducing the generation of intermediate products; the raw materials used are all inexpensive chemical products, free from heavy metal pollution, and suitable for large-scale industrial production.