Assembly And Magnetic Research Of In-situ Modified Nano-YBCO Prepared By Pulsed Laser Ablation In Gas

The in-situ modified nano-YBCO ethanol sols were successively prepared by pulsed laser ablation at the interface of YBCO target in the modified atmosphere. Explored the influence on nano-YBCO assembly morphology of modifiers selection. Results showed that nano-YBCO assembly morphology had significant influence of choosing different kinds of modifiers, amomg them with pyrocatechol and 2-nitrophenol modification, the self-assembly morphology were more specific neat, and had good reproductivity.The 2-nitrophenol in-situ modified nano-YBCO ethanol sols were successively prepared by pulsed laser ablation at the interface of YBCO target in the 2-nitrophenol modified atmosphere. Their structure and properties were characterized. The results showed that after 2-nitrophenolic modification, nano-YBCO appeared neat morphology such as nano rods and nanometer spherical particles, and its crystallization degree was decrescent. While the modified samples depositing on the acid treatment zine plate, alkali treatment aluminium sheet or zine plate, they showed nanoparticles self-assembly growth, and the assembly morphology were neat. After 2-nitrophenolic modification, the nano-YBCO ultraviolet-visible absorption peaks happened redshift, the 2-nitrophenolic affected nano-YBCO electronic structure to a certain extent.The pyrocatechol in-situ modified nano-YBCO ethanol sols were successively prepared by pulsed laser ablation at the interface of YBCO target in the pyrocatechol modified atmosphere. Their structure and properties were characterized. The results showed that after pyrocatechol modification, the morphology of YBCO nanoparticles were more neat and appeared butterfly shape or branch shape. While the modified samples depositing on the untreated aluminium sheet, acid treatment or alkali treatment zine plate, they showed nanoparticles self-assembly growth, and the assembly morphology were neat and uniform. After pyrocatechol modification, the strength of nano-YBCO ultraviolet-visible absorption peaks and fluorescence spectrum absorption peaks had significantly reduced.The in-situ modified nano-YBCO powders were successively prepared by pulsed laser ablation at the interface of YBCO target in the modified atmosphere. The results of magnetic test showed that the unmodified nano-YBCO powder lost superconductivity, and hanppened ferromagnetic phase transition below 30.00K. The 2-nitrophenol modified nano-YBCO powder restored superconductivity below 54.35K. The pyrocatechol modified nano-YBCO powder also restored superconductivity below 56.84K, but non-superconducting phases of the system hanppened ferromagnetic phase transition at 26.00K. With the decrease of temperature, the non-superconducting phases ferromagnetism of the system increased sharply, eventually even more than the critical magnetic field, which destroyed superconductivity of the system, thus making nano-YBCO/pyrocatechol system lose superconductivity.