Patra Sabyasachi, Testard Fabienne, Gobeaux Frédéric, Sicard Lorette, Shaming Delphine, Caër Sophie Le, Thill Antoine
Université Paris-Saclay, CEA, CNRS, NIMBE, 91191, Gif-sur-Yvette, France.
Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai - 400085, India.
Nanoscale. 2023 Feb 23;15(8):4101-4113. doi: 10.1039/d2nr05796d.
Hybrid aluminosilicate nanotubes (Imo-CH) have the ability to trap small organic molecules inside their hydrophobic internal cavity while being dispersed in water owing to their hydrophilic external surface. They also display a curvature-induced polarization of their wall, which favors reduction outside the nanotubes and oxidation inside. Here, we coupled bare plasmonic gold nanoparticles (GNPs) with Imo-CH and analyzed for the first time the redox reactivity of these hybrid nano-reactors upon UV illumination. We show that the coupling between GNPs and Imo-CH significantly enhances the nanotube photocatalytic activity, with a large part of water reduction occurring directly on the gold surface. The coupling mechanism strongly influences the initial H production rate, which can go from ×10 to more than ×90 as compared to bare Imo-CH depending on the synthesis route of the GNPs. The present results show that this hybrid photocatalytic nano-reactor benefits from a synergy of polarization and confinement effects that facilitate efficient H production.
杂化铝硅酸盐纳米管（Imo-CH）能够在其疏水内腔中捕获小分子有机化合物，同时由于其亲水性外表面而能分散于水中。它们还表现出壁面曲率诱导的极化现象，这有利于在纳米管外部发生还原反应而在内部发生氧化反应。在此，我们将裸等离子体金纳米颗粒（GNP）与Imo-CH耦合，并首次分析了这些杂化纳米反应器在紫外光照射下的氧化还原反应活性。我们表明，GNP与Imo-CH之间的耦合显著增强了纳米管的光催化活性，其中大部分水还原反应直接发生在金表面。耦合机制强烈影响初始产氢速率，与裸Imo-CH相比，根据GNP的合成路线，初始产氢速率可从×10提高到超过×90。目前的结果表明，这种杂化光催化纳米反应器受益于极化和限制效应的协同作用，从而促进了高效产氢。
