Wet chemical synthesis of surface passivated metal nanoparticles via decomposition of organometallic complexes

通过有机金属配合物分解湿化学合成表面钝化金属纳米颗粒

• 批准号: 119070151
• 负责人: Professor Dr. Roland A. Fischer
• 金额: --
• 依托单位: Laboratoire de Physique et Chimie des Nano-Objets
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/119070151?language=en
• 关键词: Wet; chemical; synthesis; surface; passivated

The primary objective of this proposal is the investigation of non aqueous organometallic synthesis of bimetallic alloy nanoparticles M1-xEx, where one component is a ferromagnetic transition metal M (Fe, Co, Ni), and the other is an oxophilic metal E (Al, Si, Zn). These materials can be accessed by cohydrogenolysis of two suitable molecular precursor complexes bearing hydrocarbon or amide ligands. One associated task is the dispersion of the nanoalloys as colloids in solution and basic studies on the variation of the particle size and shape by changing the reaction conditions (e.g. addition of surfactants). The second important aspect of this work will be the investigation of the oxidation behavior of the synthesized M1-xEx nanoparticles, i.e. the selective oxidation of the oxophilic metal E, respectively, which results in core-shell particles of the type M1-xEx-d@(EOn)d. Upon phase segregation, the core is enriched with the metal M, which is protected from further corrosion by an oxide shell of the oxophilic element E. Since small nano particles of ferromagnetic metals are prone to oxidation, which leads to a drastic decrease of their magnetic properties, the passivation of ferromagnetic metal nanoparticles is of high interest in material science. Hence, coated metal nanoparticles should exhibit a long term resistance versus corrosion, which would make them promising candidates in applications, e.g. data storage etc.

该提议的主要目的是研究非水有机金属合成的铁磁合金纳米颗粒M1-xEx，其中一种组分是铁磁过渡金属M（Fe，Co，Ni），另一种是亲氧金属E（Al，Si，Zn）。这些材料可以通过带有烃或酰胺配体的两种合适的分子前体络合物的共氢解来获得。一个相关的任务是纳米合金作为胶体在溶液中的分散和通过改变反应条件（例如添加表面活性剂）对颗粒尺寸和形状的变化的基础研究。本工作的第二个重要方面将是研究合成的M1-xEx纳米颗粒的氧化行为，即分别选择性氧化亲氧金属E，这导致M1-xEx-d@（EOn）d类型的核-壳颗粒。在相分离时，核富集有金属M，其被亲氧元素E的氧化物壳保护免于进一步腐蚀。由于铁磁金属纳米颗粒易被氧化，导致其磁性急剧下降，因此铁磁金属纳米颗粒的钝化在材料科学中具有很高的兴趣。因此，涂覆的金属纳米颗粒应该表现出长期的耐腐蚀性，这将使它们在应用中成为有希望的候选者，例如数据存储等。