Haensch Claudia, Erdmenger Tina, Fijten Martin W M, Hoeppener Stephanie, Schubert Ulrich S
Laboratory of Macromolecular Chemistry and Nanoscience, Eindhoven University of Technology, Eindhoven 5600 MB, The Netherlands.
Langmuir. 2009 Jul 21;25(14):8019-24. doi: 10.1021/la901140f.
Microwave irradiation has been used for the chemical modification of functional monolayers on silicon surfaces. The thermal and chemical stability of these layers was tested under microwave irradiation to investigate the possibility to use this alternative heating process for the surface functionalization of self-assembled monolayers. The quality and morphology of the monolayers before and after microwave irradiation was analyzed by surface-sensitive techniques, such as Fourier transform infrared (FTIR) spectroscopy, atomic force microscopy (AFM), and contact angle measurements. As a model reaction, the 1,3-dipolar cycloaddition of organic azides and terminal acetylenes was tested for the chemical modification of functional azide monolayers. Low and high molar mass compounds modified with an acetylene group were successfully clicked onto the surfaces as confirmed by FTIR spectroscopy and AFM investigations. It could be verified that the reaction can be performed in reaction times of 5 min, and a comparison to conventional heating mechanisms allowed us to conclude that the elevated reaction temperatures result in the fast reaction process.
微波辐射已被用于硅表面功能单分子层的化学修饰。在微波辐射下测试了这些层的热稳定性和化学稳定性，以研究将这种替代加热方法用于自组装单分子层表面功能化的可能性。通过表面敏感技术，如傅里叶变换红外（FTIR）光谱、原子力显微镜（AFM）和接触角测量，分析了微波辐射前后单分子层的质量和形态。作为一个模型反应，测试了有机叠氮化物和末端乙炔的1,3-偶极环加成反应用于功能叠氮单分子层的化学修饰。经FTIR光谱和AFM研究证实，用乙炔基团修饰的低摩尔质量和高摩尔质量化合物成功地连接到了表面。可以证实，该反应可以在5分钟的反应时间内进行，与传统加热机制的比较使我们得出结论，升高的反应温度导致了快速的反应过程。
