ZnSe center dot 0.5N(2)H(4) Hybrid Nanostructures: A Promising Alternative Photocatalyst for Solar Conversion

摘要

As the molecular precursor of ZnSe, ZnSe center dot 0.5N(2)H(4) inorganic-organic hybrids have received relatively less attention due to the feasibility of their further processing and decomposition into pure-phase ZnSe. Here we demonstrated that ZnSe center dot 0.5N(2)H(4) hybrid nanostructures, which were prepared using a facile hydrazine-assisted hydrothermal method, may practically harvest solar energy for photoconversion applications. By modulating the volume ratio of hydrazine hydrate to deionized water employed in the synthesis, the morphology of the grown ZnSe center dot 0.5N(2)H(4) can be varied, which included nanowires, nanobelts and nanoflakes. With the relatively long exciton lifetime and highly anisotropic structure, ZnSe center dot 0.5N(2)H(4) nanowires performed much better in the photodegradation of rhodamine B than the other two counterpart products. As compared to pure ZnSe nanoparticles and single-phase ZnSe nanowires obtained from further processing ZnSe center dot 0.5N(2)H(4), the ZnSe center dot 0.5N(2)H(4) hybrid nanowires exhibited superior photocatalytic performance under visible light illumination. The hybrid nanowires were further decorated with Au particles to endow them with structural and compositional diversities. Time-resolved photoluminescence spectra suggested that almost 40% of the photoexcited electrons in ZnSe center dot 0.5N(2)H(4) nanowires can be transported to the decorated Au, which enabled a fuller extent of participation of charge carriers in the photocatalytic process and thus conduced to a significant enhancement in the photocatalytic activity. The demonstrations from this work illustrate that ZnSe center dot 0.5N(2)H(4) hybrid nanostructures can serve as a versatile photocatalyst platform for advanced photocatalytic applications.