Reitböck Cornelia, Głowacki Eric, Stifter David
1 Center for Surface- and Nanoanalytics, Johannes Kepler University Linz, Linz, Austria.
2 101031 Laboratory of Organic Electronics, ITN, Campus Norrköping, Linköping University, Norrköping, Sweden.
Appl Spectrosc. 2018 May;72(5):725-730. doi: 10.1177/0003702818756899. Epub 2018 Feb 13.
Self-assembled monolayers of alkyl phosphonic acids on anodic aluminum oxide (AlOx) surfaces are important as dielectric layers in thin film electronic devices. Assessing the properties and quality of these monolayers on amorphous AlOx is limited to a few surface-sensitive methods. In this work, we study using nonlinear optical measurements the molecular ordering in n-alkyl phosphonic acids with various alkyl chain lengths (6 to 18 carbons) deposited on AlOx and show the influence of temperature on stability and conformational order. The results demonstrate that the octadecylphosphonic acid has fewest defects in the chain orientation. A detailed comparison of the longest and the shortest alkyl chain revealed different behavior in conformational ordering upon annealing.
阳极氧化铝（AlOx）表面上的烷基膦酸自组装单分子层作为薄膜电子器件中的介电层非常重要。评估非晶态AlOx上这些单分子层的性质和质量仅限于几种表面敏感方法。在这项工作中，我们使用非线性光学测量研究了沉积在AlOx上的具有不同烷基链长度（6至18个碳）的正烷基膦酸中的分子排列，并展示了温度对稳定性和构象有序性的影响。结果表明，十八烷基膦酸在链取向方面的缺陷最少。对最长和最短烷基链的详细比较揭示了退火后构象有序方面的不同行为。
