CIQUP, Institute of Molecular Sciences (IMS), Department of Chemistry and Biochemistry, Faculty of Science, University of Porto, Rua do Campo Alegre s/n, P4169-007 Porto, Portugal.
Molecules. 2023 Mar 28;28(7):3029. doi: 10.3390/molecules28073029.
This work reports the formation of silver nanoparticles (AgNPs) by sputter deposition in thin films of three different ionic liquids (ILs) with the same anion (bis(trifluoromethylsulfonyl)imide) and cation (imidazolium), but with different alkyl chain lengths and symmetries in the cationic moiety ([CCim][NTf], [CCim][NTf], and [CCim][NTf]). Ionic liquid (IL) films in the form of microdroplets with different thicknesses (200 to 800 monolayers) were obtained through vacuum thermal evaporation onto glass substrates coated with indium tin oxide (ITO). The sputtering process of the Ag onto the ILs when conducted simultaneously with argon plasma promoted the coalescence of the ILs' droplets and the formation, incorporation, and stabilization of the metallic nanoparticles in the coalesced IL films. The formation/stabilization of the AgNPs in the IL films was confirmed using high-resolution scanning electron microscopy (SEM) and UV-Vis spectroscopy. It was found that the IL films with larger thicknesses (600 and 800 monolayers) were better media for the formation of AgNPs. Among the ILs used, [CCim][NTf] was found to be particularly promising for the stabilization of AgNPs. The use of larger IL droplets as capture media was found to promote a better stabilization of the AgNPs, thereby reducing their tendency to aggregate.
这项工作报道了通过溅射沉积在三种不同的离子液体（ILs）薄膜中形成银纳米粒子（AgNPs），这三种 ILs 的阴离子相同（双（三氟甲烷磺酰基）亚胺），阳离子不同，具有不同的烷基链长度和阳离子部分的对称性（[CCim][NTf]，[CCim][NTf]和[CCim][NTf]）。通过真空热蒸发到涂有氧化铟锡（ITO）的玻璃衬底上，形成具有不同厚度（200 至 800 单层）的微滴形式的 IL 薄膜。当同时用氩等离子体进行 Ag 对 ILs 的溅射时，促进了 ILs 液滴的聚结以及金属纳米粒子在聚结的 IL 薄膜中的形成、掺入和稳定。使用高分辨率扫描电子显微镜（SEM）和紫外可见光谱法证实了 AgNPs 在 IL 薄膜中的形成/稳定。发现具有较大厚度（600 和 800 单层）的 IL 薄膜是形成 AgNPs 的更好介质。在所使用的 ILs 中，[CCim][NTf] 被发现特别有利于 AgNPs 的稳定。使用较大的 IL 液滴作为捕获介质，发现可以更好地稳定 AgNPs，从而减少它们聚集的趋势。
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