Research on novel quantum phenomena of transition metal-doped ZrO2 nanosheets

The spintronic properties of cubic ZrO₂ (c-ZrO₂) nanosheets with intrinsic defects and transition metal (TM) elements doping have been systematically studied by first-principle calculation. The results show that impurity Fe has the lowest formation energy in each monolayer compared to other defects. The most stable (111) nanosheet, coupled with the higher defect formation energy, tends to disintegrate. Only Zr vacancy (V_Zr) on the (110) surface or O vacancy (V_O) on the (111) surface can generate a ferromagnetic ground state, while other intrinsic defects cannot introduce spin polarization. Ni-doped (110) monolayer cannot introduce a local magnetic moment, while Fe and Co can. The magnetic moments produced by Fe, Co, and Ni in the (111) sheet are 2, 4, and 1 µ_B, respectively. Further investigation revealed that the magnetism was mainly contributed by the d orbitals of the TM atom and the p orbitals of the surrounding O atoms. Magnetic couplings show that only Co-Co doped monolayers can produce macroscopic magnetism. These are predicted to produce T_Cs Curie temperature above room temperature when Co-Co distances are 5.070 and 6.209 Å on the (110) surface and 7.170 and 9.485 Å on the (111) surface. The research is beneficial to the refinement of the development of spintronics.

Synthesis of nontoxic Co:CuInS2@ZnS nanocrystals with both fluorescence and room temperature ferromagnetism

Fluorescent and room temperature ferromagnetic bi-functional Co:CuInS₂@ZnS NCs were synthesized through controlling the Co doping ratio and ZnS shell thickness.

The magnetic and optical properties of 3d transition metal doped SnO2 nanosheets

Based on first-principles calculations, we study the electronic structure, magnetic properties and optical properties of transition metal atom doped SnO₂NSs.

First-principles prediction of graphene/SnO2 heterostructure as a promising candidate for FET

Very recently, graphene/SnO₂ heterostructures (G/SnO₂ HTSs) were successfully synthesized experimentally.