State Key Laboratory of Pharmaceutical Biotechnology, Medical School, and School of Life Science and Jiangsu Key Laboratory for Nano Technology, Nanjing University, Nanjing 210093, China.
Nanoscale. 2020 Apr 3;12(13):7376-7382. doi: 10.1039/c9nr10787h.
Photooxidation provides a promising strategy for photocatalysis, photodynamic therapy, and environmental protection. Unfortunately, most organic photosensitizers possess weak hydrophilicity and a π-π conjugated structure, leading to singlet oxygen self-quenching, poor loadability and therefore unsatisfactory photooxidation efficiency. Thus, dispersion of these photosensitizers within a two-dimensional porous covalent organic framework has become a feasible strategy to hinder their self-aggregation and augment their loading capacity. Here, we report a phthalocyanine-based photosensitizer loaded on covalent organic framework nanosheets. This nano-photosensitizer exhibits highly dispersed organic fluorescent phthalocyanines and a high loading capacity. The fabricated nanosheets restrict self-aggregation of photosensitizer molecules and enhance the photooxidation activity, which may offer a new paradigm for photooxidation and its multiple applications.
光氧化为光催化、光动力疗法和环境保护提供了一种很有前途的策略。不幸的是，大多数有机光敏剂的亲水性较弱，且具有π-π共轭结构，这导致单线态氧的自猝灭、负载能力差，因此光氧化效率不理想。因此，将这些光敏剂分散在二维多孔共价有机骨架中已成为阻止其自聚集和提高负载能力的可行策略。在这里，我们报道了负载在共价有机骨架纳米片上的基于酞菁的光敏剂。这种纳米光敏剂具有高度分散的有机荧光酞菁和高负载能力。所制备的纳米片限制了光敏剂分子的自聚集并增强了光氧化活性，这可能为光氧化及其多种应用提供了一种新的范例。
