Application of de-silylation strategies to the preparation of transition metal pnictide nanocrystals: The case of FeP

被引:76
作者
Perera, SC
Fodor, PS
Tsoi, GM
Wenger, LE
Brock, SL [1 ]
机构
[1] Wayne State Univ, Dept Chem, Detroit, MI 48202 USA
[2] Wayne State Univ, Dept Phys & Astron, Detroit, MI 48202 USA
关键词
D O I
10.1021/cm034443o
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Phase-pure FeP nanoparticles have been synthesized by the reaction of iron(III) acetylacetonate with tris(trimethylsilyl)phosphine at temperatures of 240-320 degreesC using trioctylphosphine oxide as a solvent and dodecylamine (DA), myristic acid (MA), or hexylphosphonic acid (HPA) as additional capping groups (ligands). The DA-capped particles prepared at 260 degreesC have an average diameter of 4.65 +/- 0.74 nm with FeP being the only observed crystalline phase. Elemental analyses indicate a high percentage yield of FeP (85%) and are consistent with 12% TOPO incorporation in the product. The addition of MA has results similar to those of the addition of DA, whereas addition of HPA seems to inhibit crystallite growth, resulting in very small (ca. 1 nm) or amorphous particles that are difficult to isolate. Magnetic susceptibility data on DA-capped FeP suggest that the moments within each particle are coupled antiferromagnetically, at least over a short range; however, there is no evidence of a Neel transition, in contrast to bulk FeP. It is likely that the FeP particles produced by this route are too small (ca. 5 nm) relative to the magnetic cell (2.9 nm) for the onset of long-range helical antiferromagnetic order, even at low temperatures (5 K) and fields (0.010 T).
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页码:4034 / 4038
页数:5
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