Tribological Durability of Silane Monolayers on Silicon
Tribological Durability of Silane Monolayers on Silicon
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DOI：
10.1021/la104778q
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发表时间：
2011-05-17
期刊：
影响因子：
3.9
通讯作者：
Jennings, G. Kane
中科院分区：
文献类型：
--
作者：
Booth, Brandon D.;Vilt, Steven G.;Jennings, G. Kane
我们报告的摩擦性能和长期的摩擦学稳定性的各种烷基硅烷单层膜在硅上使用销-盘摩擦学在环境条件下。我们发现，来自n-烷基三氯硅烷在硅上的单分子膜的耐久性与这些单分子膜的内聚能通过分子的硅烷前体，我们涉及到动力学模拟的链长呈指数增加。X射线光电子能谱（XPS）被用来表明，摩擦损伤包括分子组分的损失，可以部分取代后，暴露于含有全氟硅烷前体的溶液。对于衍生自正十八烷基三氯硅烷的单层，确定临界载荷约为250 mN（200 MPa），高于该载荷时，在100个测试循环内发生膜失效。具有羟基表面的单分子膜由于更强的尖端-表面相互作用而表现出降低的稳定性。具有交联能力的单分子膜比交联受到限制或阻止的单分子膜表现出更大的稳定性。总的来说，这些结果表明，当受到摩擦负载时，单层的机械耐久性通过最大化分散相互作用和交联以及最小化尖端-表面相互作用而大大增强。
We report the frictional performance and long-term tribological stability of various alkyl silane monolayer films on silicon by using pin-on-disk tribometry at ambient conditions. We show that the durability of monolayers derived from n-alkyltrichlorosilanes on silicon increases exponentially with the cohesive energy of these monolayers through molecular the chain length of the silane precursor, which we relate to dynamics simulations. X-ray photoelectron spectroscopy (XPS) was used to show that tribological damage consisted of the loss of molecular components that could be partially replaced upon exposure to a solution containing perfluorinated silane precursors. For monolayers derived from n-octadecyltrichlorosilane, a critical load was identified to be approximately 250 mN (200 MPa), above which failure of films occurred within 100 cycle of testing. Monolayers with hydroxyl surfaces exhibited reduced stabilities due to stronger tip-surface interactions. Monolayers with the capability for cross-linking exhibited much greater stabilities than monolayers where cross-linking was limited or prevented. Collectively, these results demonstrate that the mechanical durability of monolayers when subjected to a tribological load is greatly enhanced by maximizing dispersional interactions and cross-linking and minimizing tip-surface interactions.