【研究成果】2015年

研究成果87

A Plasmonic Molybdenum Oxide Hybrid with Reversible Tunability for Visible-Light-Enhanced Catalytic Reactions
Hefeng Cheng, Xufang Qian, Yasutaka Kuwahara, Kohsuke Mori, and Hiromi Yamashita
Adv. Mater. 2015, 27, 4616–4621

A facile solution reduction process was developed to prepare a semiconductor-based plasmonic Pd/MoO₃−x hybrid, which was composed of Pd NPs anchored on MoO₃−x plates and displayed intense LSPR in the visible-light region. As a generalized strategy, the synthetic protocol can also be applicable to other metal-NPs-decorated MoO₃−x hybrids, such as Au and Pt. The Pd/MoO₃−x hybrid underwent reversible tunability in their plasmonic resonance upon oxidation by O₂ in air and reduction by NaBH₄ in solution, and smaller Pd NPs were able to prolong the retention time of the plasmonic resonance of the hybrid. Under visible-light irradiation, the Pd/MoO₃−x hybrid showed significant plasmon-enhanced catalysis for H₂ production from NH₃BH₃ hydrolysis as well as Suzuki–Miyaura coupling reactions compared to dark conditions. This work illustrates the deficient chemistry induced plasmonic hybrid and their plasmon-enhanced catalysis, which provides tunable plasmonics in a wide range and will find more promising applications in solar-energy harvesting and conversion.

A) Schematic illustration of the Pd/MoO₃−x hybrid upon oxidation by O₂ in air and reduction by NaBH₄ in solution. B) The evolution of the optical response of Pd/MoO₃−x hybrid exposed to air for different time periods. C) The optical absorption for the original Pd/MoO₃−x hybrid, oxidized in air for 48 h, and the recovered product by NaBH₄ reduction.