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Functionalized Fe3O4 nanoparticles: influence of ligand addition sequence and pH during their continuous hydrothermal synthesis

机译：功能化的Fe3O4纳米颗粒：连续水热合成过程中配体添加顺序和pH的影响

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摘要

In this study we report various new efficient ways to synthesize and modify in situ magnetite (Fe3O4) iron oxide nanoparticles (NPs). Thanks to an apparatus especiay developed for this new method of grafting, the NPs have been synthesized and functionalized by 3,4-dihydroxyhydrocinnamic acid (DHCA) or 3,4-dihydroxy-L-phenyEalanine (LDOPA) in one step and under hydrothermaL conditions using varying concentration ratios ([organic moLecuLes]/[ferrous and ferric ions]). The organic moLecuLes were added before or after the NP synthesis. The addition of these organic moLecuLes modifies the structure, the morphoLogy, the oxidation degree and the growth of the crystahites. Adding the organic moLecuLes before the synthesis step and under acidic conditions increases the average crystaite size and prevents further oxidation whereas under basic conditions the growth is stopped but a partiaL oxidation of magnetite to maghemite NPs is observed. Adding DHCA or LDOPA after the synthesis step results in a modification of the Lattice structure and oxidation degree of the NPs but does not change the average size. This study underlines the importance of the sequence of the addition of organic moLecuLes on the synthesis of NPs.
机译：在这项研究中，我们报告了各种新的有效方法来合成和修饰原位磁铁矿（Fe3O4）氧化铁纳米颗粒（NPs）。得益于针对这种新的接枝方法开发的设备专用设备，NPs已通过3,4-二羟基氢肉桂酸（DHCA）或3,4-二羟基-L-苯丙氨酸（LDOPA）在水热条件下合成并官能化使用不同的浓度比（[有机分子] / [亚铁离子和铁离子]）。在NP合成之前或之后添加有机分子。这些有机分子的添加改变了冰晶石的结构，形态，氧化度和生长。在合成步骤之前和在酸性条件下添加有机分子会增加平均冰晶石尺寸并阻止进一步的氧化，而在碱性条件下会停止生长，但观察到磁铁矿部分氧化为磁赤铁矿。在合成步骤之后添加DHCA或LDOPA会导致晶格结构和NP氧化程度的改变，但不会改变平均大小。这项研究强调了有机分子添加顺序对NP合成的重要性。

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