Institute of Particle Technology, Clausthal University of Technology, Robert-Koch-Str, 42, D-38678 Clausthal-Zellerfeld, Germany.
Phys Chem Chem Phys. 2010 Feb 28;12(8):1750-5. doi: 10.1039/b906567a. Epub 2009 Aug 5.
We report on the synthesis of copper nanoparticles in two different water- and air-stable ionic liquids using plasma electrochemical deposition. The copper nanoparticles were deposited in 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)amide ([Py(1,4)]Tf(2)N) and 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide ([EMIm]Tf(2)N). To get information on the dimensions of the particles made, we have applied in situ transmission electron microscopy (TEM) (particles in ionic liquid). The chemical composition was investigated by ex situ X-ray photoelectron spectroscopy (XPS). We found that the copper particles produced in [Py(1,4)]Tf(2)N were larger in size compared to the particles obtained in [EMIm] Tf(2)N (roughly 20 vs. 10 nm). The chemical composition of the particle surface differs too. In both cases the particles are partly oxidised leading to a CuO shell, but the particles obtained in [Py(1,4)]Tf(2)N carry a lot of residues from the ionic liquid.
我们报告了使用等离子体电化学沉积在两种不同的水稳定和空气稳定的离子液体中合成铜纳米粒子。在 1-丁基-1-甲基吡咯烷双（三氟甲基磺酰基）酰胺([Py(1,4)]Tf(2)N)和 1-乙基-3-甲基咪唑双（三氟甲基磺酰基）酰胺([EMIm]Tf(2)N)中沉积了铜纳米粒子。为了了解所制备的粒子的尺寸，我们应用了原位透射电子显微镜（TEM）（离子液体中的粒子）。通过非原位 X 射线光电子能谱（XPS）研究了化学组成。我们发现，在[Py(1,4)]Tf(2)N 中制备的铜粒子比在[EMIm]Tf(2)N 中获得的粒子尺寸更大（约 20nm 与 10nm）。粒子表面的化学组成也不同。在两种情况下，粒子部分氧化导致形成 CuO 壳，但在[Py(1,4)]Tf(2)N 中获得的粒子带有大量来自离子液体的残留物。
