John Daniel, Mohammadi Reza, Vogel Nicolas, Andrieu-Brunsen Annette
Ernst-Berl-Institut für Technische und Makromolekulare Chemie , Technische Universität Darmstadt , 64287 Darmstadt , Germany.
Institute of Particle Technology , Friedrich-Alexander University Erlangen-Nürnberg , Cauerstraße 4 , D-91058 Erlangen , Germany.
Langmuir. 2020 Feb 25;36(7):1671-1679. doi: 10.1021/acs.langmuir.0c00043. Epub 2020 Feb 11.
The near-field of surface plasmon resonances at planar metal surfaces is confined to the nanoscale, but its resonance wavelength is located in the visible light range, making it interesting for confining polymer functionalization of surfaces but incompatible with the majority of polymerization reactions. Here, fluorescein as a polymerization initiator allowing dye-sensitized polymerization with green light (438-540 nm) is demonstrated to allow polymer functionalization of mesoporous films deposited onto planar silver metal layers. The fluorescein-induced polymer functionalization of mesoporous silica films is investigated with respect to the influence of irradiation power and irradiation time and its potential to generate polymer gradients. Finally, the polymer functionalization of mesoporous films upon surface-plasmon-initiated polymerization is demonstrated. Polymer functionalization thereby determines pH-responsive ionic mesopore accessibility. Consequently, these results present a sound basis for further nanoscale near-field-induced polymer functionalization of porous films.
平面金属表面的表面等离子体共振近场局限于纳米尺度，但其共振波长位于可见光范围内，这使得它对于表面的聚合物功能化具有吸引力，但与大多数聚合反应不兼容。在此，荧光素作为一种聚合引发剂，可实现绿光（438 - 540 nm）下的染料敏化聚合，已证明其能够使沉积在平面银金属层上的介孔膜实现聚合物功能化。针对辐照功率和辐照时间的影响及其产生聚合物梯度的潜力，对荧光素诱导的介孔二氧化硅膜的聚合物功能化进行了研究。最后，展示了表面等离子体引发聚合后介孔膜的聚合物功能化。聚合物功能化由此决定了pH响应性离子介孔的可及性。因此，这些结果为进一步进行多孔膜的纳米尺度近场诱导聚合物功能化奠定了坚实基础。
