Robatjazi Hossein, Lou Minhan, Clark Benjamin D, Jacobson Christian R, Swearer Dayne F, Nordlander Peter, Halas Naomi J
Department of Chemical Engineering, University of California, Santa Barbara, Santa Barbara, California 93106, United States.
Department of Material Science and Engineering, Stanford University, Stanford, California 94305, United States.
Nano Lett. 2020 Jun 10;20(6):4550-4557. doi: 10.1021/acs.nanolett.0c01405. Epub 2020 May 14.
Photoactivation of catalytic materials through plasmon-coupled energy transfer has created new possibilities for expanding the scope of light-driven heterogeneous catalysis. Here we present a nanoengineered plasmonic photocatalyst consisting of catalytic Pd islands preferentially grown on vertices of Al nanocubes. The regioselective Pd deposition on Al nanocubes does not rely on complex surface ligands, in contrast to site-specific transition-metal deposition on gold nanoparticles. We show that the strong local field enhancement on the sharp nanocube vertices provides a mechanism for efficient coupling of the plasmonic Al antenna to adjacent Pd nanoparticles. A substantial increase in photocatalytic H dissociation on Pd-bound Al nanocubes relative to pristine Al nanocubes can be observed, incentivizing further engineering of heterometallic antenna-reactor photocatalysts. Controlled growth of catalytic materials on plasmonic hot spots can result in more efficient use of the localized surface plasmon energy for photocatalysis, while minimizing the amount and cost of precious transition-metal catalysts.
通过等离子体耦合能量转移对催化材料进行光活化，为扩大光驱动多相催化的范围创造了新的可能性。在此，我们展示了一种纳米工程等离子体光催化剂，它由优先生长在铝纳米立方体顶点上的催化钯岛组成。与金纳米颗粒上的位点特异性过渡金属沉积不同，铝纳米立方体上的区域选择性钯沉积不依赖于复杂的表面配体。我们表明，尖锐纳米立方体顶点上强烈的局部场增强为等离子体铝天线与相邻钯纳米颗粒的有效耦合提供了一种机制。相对于原始铝纳米立方体，可以观察到与钯结合的铝纳米立方体上光催化氢解离的显著增加，这激励了对异金属天线 - 反应器光催化剂的进一步工程设计。在等离子体热点上可控地生长催化材料，可以更有效地利用局部表面等离子体能量进行光催化，同时将贵金属过渡金属催化剂的用量和成本降至最低。
