Facile Template-Free Fabrication of Aluminum-Organophosphorus Hybrid Nanorods: Formation Mechanism and Enhanced Luminescence Property

摘要

Recently, much effort has been directed toward fabrication of metal-organophosphorus hybrids with microporous, fibered, layered, and open structures to obtain desired mechanical, optical, electric, and catalytic properties. In this work, aluminum-phosphorus hybrid nanorods (APHNRs) with regular morphology were prepared by a template-free hydrothermal reaction of aluminum hydroxide with diphenylphosphinic acid (DPPA). Structure characterization of APHNRs by Fourier transform infrared spectroscopy, laser Raman spectroscopy, and X-ray diffraction demonstrate a structure with aluminophosphate main chains and phenyl pendant groups, which enable self-assembly into nanorods. The reaction conditions and the structures of phosphinic acids appear to have a significant impact on the morphology and size of nanorods. Moreover, the evolution of morphology and structure assembly during the forming process of APHNRs, as monitored by SEM and XRD, reveal a decomposition-assembly propagation process where the driving force of assembly is attributed to π-π stacking interactions between phenyl pendant groups. APHNRs show a significant increase in light emission relative to pure DPPA due to their compact structure resulting from the π-π stacking interaction. Detailed investigation revealed that photoluminescence was remarkably amplified by enhancing the compactness of APHNRs.