THERMAL-STABILITY OF SELF-ASSEMBLED MONOLAYERS
THERMAL-STABILITY OF SELF-ASSEMBLED MONOLAYERS
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DOI：
10.1021/la00023a033
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发表时间：
1994-11-01
期刊：
影响因子：
3.9
通讯作者：
GERBER, C
中科院分区：
文献类型：
--
作者：
DELAMARCHE, E;MICHEL, B;GERBER, C
用X射线光电子能谱、接触角显微镜和高带隙阻抗扫描隧道显微镜研究了十二烷基乙基醚在Au（111）表面自组装膜的结构随退火时间和温度的变化。在烘箱中退火导致小畴融合成较大的畴，并且金缺陷消失。由于蒸发导致的小缺陷（缺少分子）导致线条遗漏。垂直于缺失线的有机链的堆积密度稍低，以适应失配并产生几乎无缺陷的表面。垂直于缺失线的截面形状允许推导出域中的倾斜角方向。较高的退火温度最终导致硫醇的氧化和有机相的部分解吸。在完全解吸和降低侧压力的过程中，可以发现膜填料的几种亚稳晶体结构，并且在后期阶段，可以发现非晶相或类液相。
Structural changes as function of annealing time and temperature in monolayers of dodecanethiol self-assembled on Au(111) were studied by X-ray photoelectron spectroscopy, contact angle microscopy and high gap impedance scanning tunneling microscopy. Annealing in an oven caused the fusion of small domains into larger ones and the disappearance of gold defects. Small deficiencies (lack of molecules) due to evaporation caused the omission of lines. A slightly lower packing density of the organic chains perpendicular to the missing lines accommodated the mismatch and generated an almost defect-free surface. The shape of sections perpendicular to the missing lines allowed the direction of tilt angles in the domains to be deduced. Higher annealing temperatures eventually led to the oxidation of thiols and to partial desorption of the organic phase. On the way to full desorption and reduced lateral pressure, several metastable crystalline structures of film packing and, in later stages, of amorphous or liquid-like phases could be found.