Abstract Dual functional Sm3+ ion doped SiO2@TiO2 composites were designed to investigate their luminescence properties and photocatalytic activities under ultraviolet and simulated solar light excitation, respectively. The TiO2:Sm3+ nanoparticles, SiO2@TiO2:Sm3+ nanospheres and SiO2@TiO2:Sm3+ nanorods were successfully fabricated via the solvothermal method followed by the calcination at 700, 800 and 900 °C, respectively. The effects of morphology and calcination temperature on photocatalytic activities and luminescent properties were studied. The results demonstrated that the SiO2@TiO2:Sm3+ nanorods calcined at 700 °C exhibited the highest luminescence intensities. This was attributed to possess the least specific surface area, which decreased the quenching center of surface defects, as well as without rutile phase. Moreover, SiO2@TiO2:Sm3+ nanorods annealed at 800 °C were the optimum for improving the photodegradation efficiency of hydrolyzed polyacrylamide (HPAM) under simulated solar light irradiation. The degradation experiments results confirmed that the synergistic effect of the crystallinity/Ti–O–Si bond was the main reason for excellent photocatalytic activities. As a result, SiO2@TiO2:Sm3+ nanorods meet our requirements for better photoluminescence intensities and photocatalytic activities.

中文翻译：

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SiO2@TiO2:Sm3+纳米材料的光致发光特性和光催化活性

摘要 设计了双功能 Sm3+ 离子掺杂 SiO2@TiO2 复合材料，分别研究其在紫外光和模拟太阳光激发下的发光性能和光催化活性。TiO2:Sm3+ 纳米颗粒、SiO2@TiO2:Sm3+ 纳米球和 SiO2@TiO2:Sm3+ 纳米棒通过溶剂热法成功制备，然后分别在 700、800 和 900 °C 下煅烧。研究了形貌和煅烧温度对光催化活性和发光性能的影响。结果表明，在 700 °C 下煅烧的 SiO2@TiO2:Sm3+ 纳米棒表现出最高的发光强度。这归因于具有最小的比表面积，这降低了表面缺陷的淬火中心，并且没有金红石相。此外，SiO2@TiO2：在 800 °C 下退火的 Sm3+ 纳米棒是在模拟太阳光照射下提高水解聚丙烯酰胺 (HPAM) 光降解效率的最佳方法。降解实验结果证实结晶度/Ti-O-Si 键的协同作用是优异的光催化活性的主要原因。因此，SiO2@TiO2:Sm3+ 纳米棒满足了我们对更好的光致发光强度和光催化活性的要求。