Electrospray ion beam deposition of clusters and biomolecules
Electrospray ion beam deposition of clusters and biomolecules
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DOI：
10.1002/smll.200500479
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发表时间：
2006-04-01
期刊：
影响因子：
13.3
通讯作者：
Kern, K
中科院分区：
文献类型：
--
作者：
Rauschenbach, S;Stadler, FL;Kern, K
提出了一种基于电喷雾电离的离子束源，用于质量选择的有机大分子和无机团簇的非破坏性真空沉积。电喷雾电离用于从含有要沉积的纳米颗粒或分子的溶液中产生离子束。为了形成和引导离子束，利用了射频和静电离子光学。测量了粒子的动能分布，以控制束流的形成和着陆过程。用原位飞行时间质谱仪分析了颗粒的质荷比。为了验证该装置的性能，进行了金纳米团簇和牛血清白蛋白在石墨表面的沉积实验，并用非原位原子力显微镜进行了分析。发现小的金团簇在表面形成三维团聚，优先装饰台阶边缘。相比之下，牛血清白蛋白由于强烈的分子间相互作用，在底物平台上创建了二维分形纳米结构。
An ion beam source using electrospray ionization is presented for non-destructive vacuum deposition of mass-selected large organic molecules and inorganic clusters. Electrospray ionization is used to create an ion beam from a solution containing the nanoparticles or molecules to be deposited. To form and guide the ion beam, radio frequency and electrostatic ion optics are utilized. The kinetic energy distribution of the particles is measured to control the beam formation and the landing process. The particle mass-to-charge ratio is analyzed by in situ time-of-flight mass spectrometry. To demonstrate the performance of the setup, deposition experiments with gold nanoclusters and bovine serum albumin proteins on graphite surfaces were performed and analyzed by ex situ atomic force microscopy. The small gold clusters are found to form three-dimensional agglomerations at the surface, preferentially decorating the step edges. In contrast, bovine serum albumin creates two-dimensional fractal nanostructures on the substrate terraces due to strong intermolecular interactions.