Preformed 2 nm Ag Clusters Deposited into Ionic Liquids: Stabilization by Cation-Cluster Interaction
Preformed 2 nm Ag Clusters Deposited into Ionic Liquids: Stabilization by Cation-Cluster Interaction
复制标题
沉积到离子液体中的预制 2 nm 银簇：通过阳离子-簇相互作用实现稳定
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
H. Hövel
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文献类型：
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作者：
D. Engemann;Stefanie Roese;H. Hövel
最近，报道了通过将金属原子溅射沉积到室温离子液体（RTIL）表面来形成纳米颗粒；然而，离子液体内的生长和稳定机制仍在讨论中。在这里，我们提出了另一种方法，将直径为 2 nm 的银簇沉积在超音速喷嘴膨胀到离子液体中。因此，团簇的性质和尺寸分布在沉积之前是众所周知的。通过 UV/vis 测量和 Ag L2 边缘的 X 射线吸收近边结构 (XANES) 光谱，对团簇与离子液体的混合物进行了原位和非原位研究。 Ag 簇的等离振子共振表明，浓度高达 10 μg/mL 时，簇在 RTIL 中保持分离，这表明液体中的阳离子与簇表面之间存在相互作用过程，这一点通过 XANES 测量中吸收边的移动得到证实。为了获得更高的簇浓度和更长的...
Recently, the formation of nanoparticles by sputter deposition of metal atoms onto the surface of room-temperature ionic liquids (RTIL) was reported; however, the growth and stabilization mechanism within the ionic liquid are still in discussion. Here, we present another approach by depositing Ag clusters with a diameter of 2 nm preformed in a supersonic nozzle expansion into an ionic liquid. Thus, the properties and size distribution of the clusters are well-known before deposition. The mixture of the clusters with the ionic liquid is investigated in situ and ex situ with UV/vis measurements and X-ray absorption near-edge structure (XANES) spectroscopy at the Ag L2 edge. The plasmon resonances of the Ag clusters show that up to 10 μg/mL, the clusters stay separated in the RTIL and suggest an interaction process between the cations in the liquid and the surfaces of the clusters, which is confirmed by a shift of the absorption edge in the XANES measurements. For higher cluster concentration and on a longer...