Rinke Gordon, Harnau Ludger, Rauschenbach Stephan
Max Planck Institute for Solid State Research, Heisenbergstrasse 1, DE-70569 Stuttgart, Germany.
Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K.
J Am Soc Mass Spectrom. 2021 Jul 7;32(7):1648-1658. doi: 10.1021/jasms.0c00311. Epub 2021 Mar 3.
Electrospray ion beam deposition (ES-IBD) or ion soft landing has been demonstrated as a technique suitable for processing nonvolatile molecules in vacuum under perfectly controlled conditions, an approach also desirable for the deposition of nanoparticles. Here, we present results from several approaches to generate, characterize, and deposit nanoparticle ion beams in vacuum for deposition. We focus on cluster ion beams generated by ESI of organic salt solutions. Small cluster ions of the salts appear in the mass spectra as defined peaks. In addition, we find nanoparticle-sized aggregates, appearing as a low intensity background at high /-ratio, and show by IBD experiments that these clusters carry the major amount of material in the ion beam. This transition from clusters to nanoparticles, and their successful deposition, shows that ES-IBD can in principle handle ion beams of very heavy and highly charged nanoparticles. In related experiments, however, we found the deposition of nanoparticles from dispersions to be of low reproducibility, due to the lack of control by mass spectrometry.
电喷雾离子束沉积（ES-IBD）或离子软着陆已被证明是一种适用于在完全受控条件下在真空中处理非挥发性分子的技术，这也是一种用于沉积纳米颗粒的理想方法。在此，我们展示了几种在真空中生成、表征和沉积纳米颗粒离子束以进行沉积的方法的结果。我们重点关注由有机盐溶液的电喷雾电离（ESI）产生的团簇离子束。盐的小团簇离子在质谱中表现为明确的峰。此外，我们发现了纳米颗粒尺寸的聚集体，在高 /-比时表现为低强度背景，并通过离子束沉积（IBD）实验表明这些团簇在离子束中携带了主要量的物质。这种从团簇到纳米颗粒的转变以及它们的成功沉积表明，ES-IBD原则上可以处理非常重且高度带电的纳米颗粒的离子束。然而，在相关实验中，我们发现由于缺乏质谱控制，纳米颗粒从分散体中的沉积重现性较低。
