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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Synthesis of monodispersed magnetite nanoparticles from iron pivalate clusters
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Synthesis of monodispersed magnetite nanoparticles from iron pivalate clusters

机译：从新戊酸铁簇团合成单分散磁铁矿纳米颗粒

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摘要

The iron pivalate clusters [Fe_3O(O_2C ~tBu)_6(H_2O)_3](O_2C ~tBu)·HO_2C~tBu (1), [Fe _8(OH)_4(O_2C~tBu)_(12)(OC _6H_4C_6H_5)_8] (2) and [Fe_3O(O_2C~tBu)_6(C_5H _5N)_3] (3) have been used as single source precursors to synthesise iron oxide nanoparticles by a hot injection thermal decomposition method in oleylamine, hexadecanol, oleic acid, oleylamine/oleic acid with dodecanol or octyl ether as solvent. The effect of the different reaction parameters such as temperature, reaction time and capping agents on the phase and morphology were studied. The reaction time was studied for (1) by thermolysis in a mixture of oleylamine, oleic acid, hexadecanol and dodecanol (solvent) at 260 °C. The results obtained showed that a mixture of maghemite-C (Fe_2O_3) and magnetite (Fe_3O _4) were obtained for aliquots withdrawn for reaction times of less than 30 minutes whilst only magnetite was obtained after one hour. The nanoparticles were characterised by p-XRD, TEM and magnetic measurements. TEM showed that monodispersed magnetite particles were obtained when the precursor was injected at the boiling point of the solvent. The diameter of the monodispersed nanoparticles obtained by the thermolysis of [Fe _3O(O_2C~tBu)_6(H_2O) _3](O_2C~tBu)·HO_2C ~tBu (1) in oleylamine, hexadecanol, oleic acid with dodecanol or octyl ether as solvent were 4.3 ± 0.4 and 4.9 ± 0.5 nm respectively. Magnetic measurements revealed that all the particles are superparamagnetic.
机译：新戊酸铁簇[Fe_3O（O_2C〜tBu）_6（H_2O）_3] [O_2C〜tBu）·HO_2C〜tBu（1），[Fe _8（OH）_4（O_2C〜tBu）_（12）（OC _6H_4C_6H_5） _8]（2）和[Fe_3O（O_2C〜tBu）_6（C_5H _5N）_3]（3）已用作单源前体，通过热注射热分解方法在油胺，十六烷醇，油酸中合成氧化铁纳米颗粒。以十二烷醇或辛醚为溶剂的油胺/油酸。研究了温度，反应时间和封端剂等不同反应参数对相和形貌的影响。通过在油胺，油酸，十六烷醇和十二烷醇（溶剂）的混合物中在260℃下热解来研究（1）的反应时间。所获得的结果表明，对于取出等分试样的反应时间少于30分钟，获得了磁铁矿-C（Fe_2O_3）和磁铁矿（Fe_3O_4）的混合物，而在一小时后仅获得磁铁矿。通过p-XRD，TEM和磁测量来表征纳米颗粒。 TEM显示，当在溶剂的沸点注入前体时，获得了单分散的磁铁矿颗粒。通过[Fe _3O（O_2C〜tBu）_6（H_2O）_3]（O_2C〜tBu）·HO_2C〜tBu（1）在油胺，十六烷醇，油酸中以十二烷醇或辛醚为热解物获得的单分散纳米颗粒的直径溶剂分别为4.3±0.4和4.9±0.5 nm。磁性测量表明，所有粒子都是超顺磁性的。

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