【摘要】 本文采用热分解法制备了NaYbF₄纳米晶,并通过控制反应时间调节纳米晶尺寸来增加其比表面积,进而提高活性氧产率。通过TEM图像对NaYbF₄纳米晶的尺寸进行表征。利用化学探针法检验NaYbF₄纳米晶分散液中活性氧的产生,并计算了活性氧产生速率。结果表明纳米晶尺寸在影响Yb³⁺与O₂的能量传递过程中占主导因素。同时,当生长时间较短时,晶格缺陷较多,无辐射弛豫过程增加,也影响活性氧产生速率。尺寸约8 nm时,NaYbF₄纳米晶活性氧产生速率最大。更多还原

【Abstract】 NaYbF₄ nanocrystals were synthesized by thermal decomposition method. The size of NaYbF₄ nanocrystals was adjusted by reactive time,which can increase specific surface area and improve generation rate of reactive oxygen species（ ROS）. The size can be characterized by TEM image. The generation of ROS was detected by chemical probe method and generation rate of ROS was calculated. The result demonstrates that the size takes an important role on the energy transfer process from Yb³⁺ to O₂. Meanwhile,short growth time for crystal would increase the defect,resulting in large non-radiative relaxation processes and low generation rate of ROS. When the size is around 8 nm,the generation of ROS from NaYbF₄ is optimized.更多还原