Monoatomic and cluster beam effect on ToF-SIMS spectra of self-assembled monolayers on gold
Monoatomic and cluster beam effect on ToF-SIMS spectra of self-assembled monolayers on gold
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DOI：
10.1016/j.apsusc.2008.05.065
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发表时间：
2008-12-15
影响因子：
6.7
通讯作者：
Licciardello, A.
中科院分区：
文献类型：
--
作者：
Tuccitto, N.;Torrisi, V.;Licciardello, A.
自组装单分子膜具有良好定义的体系，是研究二次离子质谱中主离子束效应的良好模型表面。研究了多原子主光束对脂肪族和芳香族自组装单层膜的影响。特别地，我们用Bi+， Bi-3(+), Bi-5（+）光束分析了基底金属团簇（Au-n）相对于分子离子(M)和团簇（MxAuy）的二次离子产率的变化。此外，还讨论了二次离子产生效率的差异。簇束的主要作用是增加低质量碎片的形成和增强基片相关的金簇。结果表明，与许多其他情况不同，自组装单层的静态SIMS并没有受益于多原子伯离子的使用。(c) 2008 Elsevier B.V.版权所有
Self-assembled monolayers represent well-defined systems that is a good model surface to study the effect of primary ion beams used in secondary ion mass spectrometry. The effect of polyatomic primary beams on both aliphatic and aromatic self-assembled monolayers has been studied. In particular, we analysed the variation of the relative secondary ion yield of both substrate metal-cluster (Au-n ) in comparison with the molecular ions (M ) and clusters (MxAuy ) by using Bi+, Bi-3(+), Bi-5(+) beams. Moreover, the differences in the secondary ion generation efficiency are discussed. The main effect of the cluster beams is related to an increased formation of low-mass fragments and to the enhancement of the substrate related gold-clusters. The results show that, at variance of many other cases, the static SIMS of self-assembled monolayers does not benefit of the use of polyatomic primary ions. (c) 2008 Elsevier B.V. All rights reserved.