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首页> 外文期刊>Chimie Nouvelle >Functionalization of Nano-Structured Carbons for the Preparation of Supported Heterometallic Cluster-Derived Nanoparticles
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Functionalization of Nano-Structured Carbons for the Preparation of Supported Heterometallic Cluster-Derived Nanoparticles

机译：纳米结构化碳的功能化，用于制备负载型杂金属团簇衍生纳米颗粒

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摘要

Multi-walled carbon nanotubes (MWNT), carbon nanofibers (CNF) and an ordered mesoporous carbon (OMC) have been functionalized at their surface with chelating phosphine (PPh2) and ammonium (NMe_3~+) groups, as anchoring sites for metal complexes. The surface functionalization has been monitored by XPS, elemental analyses, N2 physisorption and/or SEM surface morphology analysis at each step. Heterometallic clusters containing Fe and Co or Ru associated or not with Au and/or Pt were incorporated onto the surface of the functionalized MWNT, CNF and OMC as well as their pristine forms for comparison. The ligands of the anchored molecular species were then removed by gentle thermal treatment in order to form nanoparticies. The samples have been fully characterized before and after thermal treatment by several techniques. The obtained nanoparticies were shown by TEM to be better dispersed and of smaller size on functionalized than on pristine supports. The nanocomposites may find applications in heterogeneous catalysis or magnetism. Preliminary studies showed that the Ru-Ptano-C materials were active for cinnamaldehyde hydrogenation and ammonia synthesis, while Fe-Coano-C consisted in blocked superparamagnetic nanoparticies together with isolated paramagnetic ions.
机译：多壁碳纳米管（MWNT），碳纳米纤维（CNF）和有序介孔碳（OMC）在表面已被螯合膦（PPh2）和铵（NMe_3〜+）基团官能化，作为金属配合物的固定位点。在每个步骤中，通过XPS，元素分析，N2物理吸附和/或SEM表面形态分析来监测表面功能化。将含有Fe和Co或Ru或不与Au和/或Pt结合或不结合的杂金属簇结合到功能化的MWNT，CNF和OMC的表面上，以及它们的原始形式进行比较。然后通过温和的热处理除去锚定的分子种类的配体，以形成纳米颗粒。在热处理之前和之后，已通过多种技术对样品进行了充分表征。通过TEM显示获得的纳米颗粒在功能化上比在原始载体上更好地分散并且尺寸更小。纳米复合材料可发现在多相催化或磁性中的应用。初步研究表明，Ru-Pt / nano-C材料对肉桂醛加氢和氨合成具有活性，而Fe-Co / nano-C包含封闭的超顺磁性纳米粒子以及分离的顺磁性离子。

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