Nanocylindrical confinement imparts highest structural order in molecular self-assembly of organophosphonates on aluminum oxide.

Nanocylindrical confinement imparts highest structural order in molecular self-assembly of organophosphonates on aluminum oxide.
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纳米圆柱限制赋予有机膦酸酯在氧化铝上的分子自组装最高的结构秩序

DOI:
10.1039/c7nr02420g
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发表时间:
2017
期刊:
影响因子:
6.7
通讯作者:
Tornow
Tornow
中科院分区:
材料科学2区
文献类型:
--
作者:
Pathak;Anshuma;Achyut;Braunschweig;Björn;Meltzer;Christian;Hongdan;Lemmens;Winfried;Schwartz;Jeffrey;Tornow

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我们报道了几何约束对生长在阳极氧化铝(AAO)上的烷基膦酸酯自组装单分子膜(SAM)中分子内相互作用的影响。这些薄膜中的分子有序性是由和频发生(SFG)光谱确定的,这是一种比红外吸收光谱更灵敏的有序性测量方法。使用SFG,我们表明在AAO上生长的薄膜在检测范围内,几乎完全有序地形成了全反式烷基链结构。与之形成鲜明对比的是,在平面的等离子体氧化氧化铝或α-Al_2O_3(0001)上形成的薄膜充满了粗糙缺陷。我们将这些差异归因于AAO的纳米圆柱形结构,它实施了分子限制。
We report the impact of geometrical constraint on intramolecular interactions in self-assembled monolayers (SAMs) of alkylphosphonates grown on anodically oxidized aluminum (AAO). Molecular order in these films was determined by sum frequency generation (SFG) spectroscopy, a more sensitive measure of order than infrared absorption spectroscopy. Using SFG we show that films grown on AAO are, within detection limits, nearly perfectly ordered in an all-trans alkyl chain configuration. In marked contrast, films formed on planar, plasma-oxidized aluminum oxide or α-Al2O3 (0001) are replete with gauche defects. We attribute these differences to the nanocylindrical structure of AAO, which enforces molecular confinement.
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