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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Tuning molecule-surface interactions with sub-nanometer-thick covalently bound organic monolayers
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Tuning molecule-surface interactions with sub-nanometer-thick covalently bound organic monolayers

机译：与亚纳米厚的共价键合的有机单分子层调节分子-表面相互作用

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摘要

Measurements of the thermal desorption of methyl bromide (MeBr) from bare and RS-functionalized GaAs(110), where R = CH3 and CH3CH2, reveal marked systematic changes in molecule-surface interactions. As the thickness of the organic spacer layer is increased, the electrostatic MeBr-GaAs(110) interaction decreases, lowering the activation energy for desorption, E-d, as well as decreasing the critical coverage required for nucleation of bulklike MeBr. On the CH3CH2S-functionalized surface, E-d is lowered to a value roughly equal to that for desorption from three-dimensional (3-D) clusters; because the kinetics of desorption of isolated molecules differs from that for desorption from clusters, desorption of isolated molecules from the organic surface occurs at a lower temperature than desorption from the clusters. Thus, the "monolayer" desorption wave occurs at a lower temperature than the "multilayer" desorption wave. These results illustrate the role that organic chain length in nanometer-scale thin films can play in alteration of the delicate balance of interfacial interactions.
机译：测量从裸露的和RS官能化的GaAs（110）（其中R = CH3和CH3CH2）上的甲基溴（MeBr）的热脱附量，揭示了分子-表面相互作用中的明显系统变化。随着有机间隔层厚度的增加，静电MeBr-GaAs（110）相互作用降低，从而降低了解吸E-d的活化能，并降低了块状MeBr成核所需的临界覆盖率。在CH3CH2S功能化的表面上，E-d降低到大约等于从三维（3-D）团簇中解吸的值。因为分离的分子的解吸动力学不同于簇的解吸动力学，所以分离的分子从有机表面的解吸发生的温度低于从簇的解吸。因此，“单层”解吸波发生在比“多层”解吸波低的温度下。这些结果说明了纳米级薄膜中有机链长可以在界面相互作用的微妙平衡变化中发挥作用。

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