Yifan Dai,Jie Ju,Liling Luo,Hao Jiang,Yanjie Hu,Chunzhong Li
The synthesis of high-entropy alloys (HEAs) with ultra-small particle sizes has long been a challenging task. The complex and time-consuming synthesis process hinders their practical application and widespread adoption. This study presents the novel synthesis of TiO 2 nanoparticles loaded with a quinary high-entropy alloy through flame spray pyrolysis (FSP) for the first time. The extremely fast heating rate of flame combustion makes the precursor fast pyrolysis gasification, high temperature in the flame field promotes the metal vapor mixing uniformly, and the fast quenching process can reduce the particle aggregation sintering, the ultra-small particle size of HEA firmly attached to the TiO 2 surface. The catalysts prepared via this gas-to-particle pathway exhibit excellent performance in CO 2 hydrogenation, achieving a conversion rate of 62% at 450 °C, and maintaining their activity for over 220 h without significant particle agglomeration. This finding provides valuable insights for the future design of catalytically active materials with enhanced activity and long-term stability.
Bo Li,Mengxin Liu,Xinan Shi,Qiulin Cao,Zhan Ni,Chengzeng Lu,Daocheng Pan
In the past, an Eu3+-doped YVO4 bulk phosphor with a photoluminescence quantum yield (PLQY) of 70% was prepared by a high-temperature solid-state reaction method at 1000 °C for 5 h. In this work, ultrasmall Eu3+-doped YVO4 nanocrystals with a PLQY of 62% are rapidly synthesized by a facile ligand-assisted coprecipitation method at room temperature. The reaction is conducted under ambient conditions and is completed in 1 min. Water and ethanol are used as the solvents, while short-chain butyric acid and butylamine serve as the capping agents. As-prepared nanocrystals are characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results show that Eu3+-doped YVO4 nanocrystals are well dispersed with a particle size of 3.6 nm. The luminescent nanocrystals prepared in this study have three advantages: room temperature preparation, high PLQY, and ultrasmall particle size. These results reveal that Eu3+-doped YVO4 luminescent nanocrystals could have high potential in lighting, display, anti-counterfeiting, and bioimaging.
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