High-Throughput Fabrication of Au-Cu Nanoparticle Libraries by Combinatorial Sputtering in Ionic Liquids
High-Throughput Fabrication of Au-Cu Nanoparticle Libraries by Combinatorial Sputtering in Ionic Liquids
复制标题
DOI：
10.1002/adfm.201303140
复制
发表时间：
2014-04-01
影响因子：
19
通讯作者：
Ludwig, Alfred
中科院分区：
文献类型：
--
作者：
Koenig, Dennis;Richter, Kai;Ludwig, Alfred
通过将Cu和Au组合共溅射沉积到离子液体（IL）1-丁基-3-甲基咪唑鎓双（三氟甲基磺酰基）酰亚胺（[C（1）C（4）im][Tf 2N]）中来合成二元合金纳米颗粒（NP）的材料库，所述离子液体（IL）1-丁基-3-甲基咪唑鎓双（三氟甲基磺酰基）酰亚胺包含在微机械加工的腔阵列衬底中。通过透射电子显微镜（TEM）、X射线衍射（XRD）、UV-Vis测量（UV-Vis）和衰减全反射傅里叶变换红外（ATR-FTIR）光谱研究所得NP和NP-悬浮液。尽管可以使用TEM在IL中直接观察到NP，但是对于XRD测量，NP浓度太低而不能得到令人满意的结果。因此，开发了一种新的涉及封端剂的NP分离方法，其能够将NP与IL分离而不改变它们的大小、形态、组成和聚集状态。NP表征的结果表明，除了一元Cu和Au NP之外，可以容易地获得小于7 nm的化学计量和非化学计量的Cu-Au NP。而合金纳米颗粒的尺寸和形状随着合金组成而变化，对于固定的组成，纳米颗粒具有小的尺寸分布。所有封端的NP的测得的晶格常数显示出意想不到的增加值，这可能与NP/表面活性剂相互作用。
Materials libraries of binary alloy nanoparticles (NPs) are synthesized by combinatorial co-sputter deposition of Cu and Au into the ionic liquid (IL) 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([C(1)C(4)im][Tf2N]), which is contained in a micromachined cavity array substrate. The resulting NPs and NP-suspensions are investigated by transmission electron microscopy (TEM), X-ray diffraction (XRD), UV-Vis measurements (UV-Vis), and attenuated total reflection Fourier transformed infrared (ATR-FTIR) spectroscopy. Whereas the NPs can be directly observed in the IL using TEM, for XRD measurements the NP concentration is too low to lead to satisfactory results. Thus, a new NP isolation process involving capping agents is developed which enables separation of NPs from the IL without changing their size, morphology, composition, and state of aggregation. The results of the NP characterization show that next to the unary Cu and Au NPs, both stoichiometric and non-stoichiometric Cu-Au NPs smaller than 7 nm can be readily obtained. Whereas the size and shape of the alloy NPs change with alloy composition, for a fixed composition the NPs have a small size distribution. The measured lattice constants of all capped NPs show unexpected increased values, which could be related to the NP/surfactant interactions.