Embedded high density metal nanoparticles with extraordinary thermal stability derived from guest-host mediated layered double hydroxides.
Embedded high density metal nanoparticles with extraordinary thermal stability derived from guest-host mediated layered double hydroxides.
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DOI：
10.1021/ja106421g
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发表时间：
2010-10
影响因子：
15
通讯作者：
Mengqiang Zhao;Qiang Zhang;Wei Zhang;Jiaqi Huang;Yinghao Zhang;D. Su;F. Wei
中科院分区：
文献类型：
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作者：
Mengqiang Zhao;Qiang Zhang;Wei Zhang;Jiaqi Huang;Yinghao Zhang;D. Su;F. Wei
使用化学前体介导的方法来形成具有极高密度（10（14）至10（16）m（-2））、可控的尺寸分布（3-20 nm）和在高温（900 ℃）下良好的热稳定性的催化剂纳米颗粒（NP）。这使用沉积在层状双氢氧化物（LDH）中的金属阳离子，通过还原得到金属催化剂NP。关键是LDHs具有通过宾主化学选择和交换的插层阴离子，以防止金属NPs的烧结，并且即使在900 °C下也有最小的烧结。在MoO（4）（2-）插层的Fe/Mg/Al LDH薄片上的金属NPs被成功地用作单壁碳纳米管阵列的双螺旋生长的催化剂。该方法提供了一种制造具有催化和材料科学所需尺寸和密度的热稳定金属NPs催化剂的通用方法。
A chemical precursor mediated process was used to form catalyst nanoparticles (NPs) with an extremely high density (10(14) to 10(16) m(-2)), controllable size distribution (3-20 nm), and good thermal stability at high temperature (900 °C). This used metal cations deposited in layered double hydroxides (LDHs) to give metal catalyst NPs by reduction. The key was that the LDHs had their intercalated anions selected and exchanged by guest-host chemistry to prevent sintering of the metal NPs, and there was minimal sintering even at 900 °C. Metal NPs on MoO(4)(2-) intercalated Fe/Mg/Al LDH flakes were successfully used as the catalyst for the double helix growth of single-walled carbon nanotube arrays. The process provides a general method to fabricate thermally stable metal NPs catalysts with the desired size and density for catalysis and materials science.