配体结构对铜纳米颗粒稳定性和氧化的影响。
Influence of ligand structure on the stability and oxidation of copper nanoparticles.
作者信息
Kanninen Petri, Johans Christoffer, Merta Juha, Kontturi Kyösti
机构信息
Helsinki University of Technology, Laboratory of Physical Chemistry and Electrochemistry, P.O. Box 6100, 02015 TKK, Finland.
出版信息
J Colloid Interface Sci. 2008 Feb 1;318(1):88-95. doi: 10.1016/j.jcis.2007.09.069. Epub 2007 Oct 24.
The stability and oxidation of copper nanoparticles stabilized with various ligands have been studied. Lauric acid-capped copper nanoparticles were prepared by a modified Brust-Schiffrin method. Then, ligand exchange with an excess of different capping agents was performed. Oxidation and stability were studied by UV-vis, XRD, and TEM. Alkanethiols and oleic acid were found to improve air stability. The oxidation resistance of thiol-capped copper nanoparticles was found to increase with the chain length of the thiol. However, excess thiol caused etching of the particles under nitrogen. With oleic acid no etching was observed under nitrogen. After oxidation, no traces of the ligand-exchanged particles were found, suggesting their dissolution due to excess ligand. Oleic acid protected the particles against oxidation better than the tested thiols at large excess (ligand-copper ratio 20:1).
研究了用各种配体稳定的铜纳米颗粒的稳定性和氧化情况。通过改进的布斯特-希夫林方法制备了月桂酸包覆的铜纳米颗粒。然后，用过量的不同封端剂进行配体交换。通过紫外可见光谱、X射线衍射和透射电子显微镜研究了氧化和稳定性。发现链烷硫醇和油酸可提高空气稳定性。发现硫醇包覆的铜纳米颗粒的抗氧化性随硫醇链长的增加而增强。然而，过量的硫醇在氮气气氛下会导致颗粒蚀刻。在氮气气氛下，用油酸处理未观察到蚀刻现象。氧化后，未发现配体交换颗粒的痕迹，表明由于配体过量它们发生了溶解。在大量过量（配体与铜的比例为20:1）时，油酸比测试的硫醇能更好地保护颗粒免受氧化。
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