We used a dielectric barrier discharge(DBD)plasma technique to eliminate the protective ligand of ZnAl-hydrotalcite-supported gold nanoclusters.We used X-ray powder diffraction,ultraviolet-visible spectrophotometry,th...We used a dielectric barrier discharge(DBD)plasma technique to eliminate the protective ligand of ZnAl-hydrotalcite-supported gold nanoclusters.We used X-ray powder diffraction,ultraviolet-visible spectrophotometry,thermogravimetric analysis,and high angle annular dark-field-scanning transmission electron microscopy characterization to show that the samples pretreated with/without DBD-plasma displayed different performances in CO oxidation.The enhanced activity was obtained on the plasma-treated samples,implying that the protective ligand was effectively removed via the plasma technique.The crystal structure of the plasma-treated samples changed markedly,suggesting that the plasma treatment could not only break the chemical bond between the gold and the protective agent but could also decompose the interlayer ions over the hydrotalcite support.The particle sizes of the gold after DBD-plasma treatment implied that it was a good way to control the size of the gold nanoparticles under mild conditions.展开更多
一直以来,金属纳米材料有着非常重要的应用价值且受到广泛关注,金属团簇碰撞合并过程的研究成果对认清团簇的沉积和纳米金属膜及块体材料的形成有重要的意义。采用Johnson的嵌入原子势(Embeded atom method,EAM)模型并结合分子动力学模...一直以来,金属纳米材料有着非常重要的应用价值且受到广泛关注,金属团簇碰撞合并过程的研究成果对认清团簇的沉积和纳米金属膜及块体材料的形成有重要的意义。采用Johnson的嵌入原子势(Embeded atom method,EAM)模型并结合分子动力学模拟方法,模拟金原子团簇在不同的碰撞平动速度作用下的碰撞合并过程,仅给弹团簇一定大小的碰撞动能,迫使两个团簇产生相对速度并发生相互碰撞合并,研究在不同的碰撞平动速度下和不同的团簇大小下对团簇碰撞合并过程产生的影响及对碰撞合并之后新团簇的性质产生的影响。在进行模拟碰撞之前,先对团簇进行了"退火"处理,只模拟了同等尺度大小的两个金原子团簇之间的碰撞合并过程。展开更多
文摘We used a dielectric barrier discharge(DBD)plasma technique to eliminate the protective ligand of ZnAl-hydrotalcite-supported gold nanoclusters.We used X-ray powder diffraction,ultraviolet-visible spectrophotometry,thermogravimetric analysis,and high angle annular dark-field-scanning transmission electron microscopy characterization to show that the samples pretreated with/without DBD-plasma displayed different performances in CO oxidation.The enhanced activity was obtained on the plasma-treated samples,implying that the protective ligand was effectively removed via the plasma technique.The crystal structure of the plasma-treated samples changed markedly,suggesting that the plasma treatment could not only break the chemical bond between the gold and the protective agent but could also decompose the interlayer ions over the hydrotalcite support.The particle sizes of the gold after DBD-plasma treatment implied that it was a good way to control the size of the gold nanoparticles under mild conditions.
文摘一直以来,金属纳米材料有着非常重要的应用价值且受到广泛关注,金属团簇碰撞合并过程的研究成果对认清团簇的沉积和纳米金属膜及块体材料的形成有重要的意义。采用Johnson的嵌入原子势(Embeded atom method,EAM)模型并结合分子动力学模拟方法,模拟金原子团簇在不同的碰撞平动速度作用下的碰撞合并过程,仅给弹团簇一定大小的碰撞动能,迫使两个团簇产生相对速度并发生相互碰撞合并,研究在不同的碰撞平动速度下和不同的团簇大小下对团簇碰撞合并过程产生的影响及对碰撞合并之后新团簇的性质产生的影响。在进行模拟碰撞之前,先对团簇进行了"退火"处理,只模拟了同等尺度大小的两个金原子团簇之间的碰撞合并过程。
