دانلود رایگان مقاله نانوالیاف آلی ابرمولکولی با عملکرد اکسیداسیون نوری نور مرئی بسیار کارآمد

Abstract

The development of organic materials for visible light driven photocatalytic is regarded as one of the most promising avenues to solve environment and solar-energy utilization issue. Here, we present that one-dimensional supramolecular organic nanofibers, self-assembled by a carboxy-substituent perylene diimide (PDI) molecule through H-type π-π stacking and hydrogen bonding, can act as a robust and effective photocatalyst for both organic pollutants degradation and water oxidation under visible light without the apparent need for an added metal co-catalysts. We corroborate that the highly efficient and stable activity of such supramolecar photocatalyst are attributed to the introduction of terminal carboxyl group, which leads to well-defined and stable H-type π-π stacking, and constructs the internal electric field in supramolecular nanofibers, thereby resulting in the deepening of valence band (VB) and the enhancement of migration and separation efficiency of photo-induced charge carriers. Our findings may help the development of semiconducting-based organic supramolecular materials for applications in environment protection and water splitting.

4. Conclusion

In conclusion, an one-dimensional supramolecular nanofibers photocatalyst based on carboxy-substituent perylene diimide have been developed. Such purely organic PDI supramolecular nanofibers exhibit superior photocatalytic activity both in organic pollutions degradation and water oxidation under visible light without assistance of co-catalyst. Most importantly, these photocatalysts were demonstrated to be very stable with cycling at acidic condition, which crucial for industrial applications. Unique onedimension -conjugated delocalization and internal electric field in supramolecular nanofibers result in the highly efficient excitation, separation and migration of carriers, which was demonstrated to be the key factor to the photocatalysis process. The catalyst has the advantages of sufficiently efficient, robust, earth-abundant and broad spectral response. The present results may offer a new vista for the development of supramolecular organic semiconductor in environmental protection and water splitting.