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Synthesis of carbon-encapsulated iron nanoparticles by pyrolysis of iron citrate and poly(vinyl alcohol): A critical evaluation of yield and selectivity

机译：柠檬酸铁和聚乙烯醇热解合成碳包裹的铁纳米颗粒：收率和选择性的关键评价

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摘要

Carbon-encapsulated iron nanoparticles were synthesized by pyrolysis at 1000 °C of two solid precursors: poly(vinyl alcohol) and iron citrate. The weight ratio between the precursors controlled the reaction yield, crystallinity, morphological features and magnetic properties of the products. The encapsulation yield of iron nanoparticles in carbon shells was strongly influenced by the iron-to-carbon ratio and depended on the iron citrate content in the initial reactant mixtures. Despite the inherent simplicity of the process and the use of low cost starting materials the demonstrated route possesses limited selectivity, especially at high iron-to-carbon ratios. At these experimental conditions the as-obtained products contained non-encapsulated Fe particles and graphite in addition to magnetic carbon encapsulates. These by-products were effectively removed by a one-pot purification procedure that included acid treatment
机译：碳包裹的铁纳米颗粒是通过在1000°C下热解两种固体前体合成的：聚乙烯醇和柠檬酸铁。前体之间的重量比控制了产物的反应产率，结晶度，形态特征和磁性。铁纳米颗粒在碳壳中的包封率受到铁碳比的强烈影响，并取决于初始反应混合物中柠檬酸铁的含量。尽管该方法固有的简单性和使用低成本的起始原料，但已证明的路线具有有限的选择性，特别是在高铁碳比的情况下。在这些实验条件下，所获得的产物除磁性碳包封物外还包含未包封的Fe颗粒和石墨。通过一锅纯化程序（包括酸处理）有效去除了这些副产物

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