Metal and metal oxide nanoparticle synthesis from metal organic frameworks (MOFs): finding the border of metal and metal oxides
Metal and metal oxide nanoparticle synthesis from metal organic frameworks (MOFs): finding the border of metal and metal oxides
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DOI：
10.1039/c1nr10944h
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发表时间：
2012-01-01
期刊：
影响因子：
6.7
通讯作者：
Poddar, Pankaj
中科院分区：
文献类型：
--
作者：
Das, Raja;Pachfule, Pradip;Poddar, Pankaj
在此，我们首次报道了一种通过金属有机框架（mof）的受控热裂解成功合成嵌入碳基体的高结晶金属和金属氧化物纳米颗粒的通用策略。通过对mof的热分解合成Cu/CuO、Co/Co3O4、ZnO、Mn2O3、MgO和CdS/CdO等多种金属和金属氧化物纳米颗粒的合理化策略，首次证明了mof中还原电位为-0.27伏或更高的金属离子在N-2中热分解时总是形成纯金属纳米颗粒，而还原电位低于-0.27伏的金属离子在N-2中热分解时形成金属氧化物纳米颗粒。另一个有趣的事实是，我们已经发现纳米颗粒尺寸和MOF前体内部二级建筑单元之间的距离之间存在独特的关系。有趣的是，在热裂解过程中，碳基体的结晶度也受到环境（N-2和空气）的很大影响。此外，这些分散在碳基体中的纳米颗粒表现出良好的H-2和CO2吸附性能，这取决于用于mof热裂解的环境。
Herein, for the first time, we report a generalized strategy for the successful synthesis of highly crystalline metal and metal oxide nanoparticles embedded in a carbon matrix by the controlled thermolysis of metal organic frameworks (MOFs). The rationalized synthesis strategy of a broad range of metal and metal oxides nanoparticles, such as Cu/CuO, Co/Co3O4, ZnO, Mn2O3, MgO and CdS/CdO, by thermolysis of MOFs demonstrates for the first time that metal ions with a reduction potential of -0.27 volts or higher present in MOFs always form pure metal nanoparticles during thermolysis in N-2, whereas metal ions with a reduction potential lower than -0.27 volts form metal oxide nanoparticles during thermolysis in N-2. Another point of interest is the fact that we have found a unique relationship between the nanoparticle size and the distance between the secondary building units inside the MOF precursors. Interestingly, the crystallinity of the carbon matrix was also found to be greatly influenced by the environment (N-2 and air) during thermolysis. Moreover, these nanoparticles dispersed in a carbon matrix showed promising H-2 and CO2 adsorption properties depending on the environment used for the thermolysis of MOFs.