Metal-organic frameworks (MOFs) and metal nanoparticles are two classes of materials that have received considerable recent attention, each for controlling chemical reactivities, albeit in very different ways. Here, we report the growth of MOF shell layers surrounding aluminum nanocrystals (Al NCs), an Earth-abundant metal with energetic, plasmonic, and photocatalytic properties. The MOF shell growth proceeds by means of dissolution-and-growth chemistry that uses the intrinsic surface oxide of the NC to obtain the Al3+ ions accommodated into the MOF nodes. Changes in the Al NC plasmon resonance provide an intrinsic optical probe of its dissolution and growth kinetics. This same chemistry enables a highly controlled oxidation of the Al NCs, providing a precise method for reducing NC size in a shape-preserving manner. The MOF shell encapsulation of the Al NCs results in increased efficiencies for plasmon-enhanced photocatalysis, which is observed for the hydrogen-deuterium exchange and reverse water-gas shift reactions.
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机译：金属有机骨架（MOF）和金属纳米粒子是两类材料，最近受到了相当大的关注，每种材料都用于控制化学反应性，尽管方式非常不同。在这里，我们报告了围绕铝纳米晶体（Al NCs）的MOF壳层的生长，铝纳米晶体是一种富含高能，等离激元和光催化特性的富含地球的金属。 MOF壳的生长通过溶解和生长化学进行，该化学使用NC的固有表面氧化物获得容纳在MOF节点中的Al 3 + 离子。 Al NC等离子体激元共振的变化为其溶解和生长动力学提供了一个内在的光学探针。相同的化学成分可以高度受控地控制Al NC的氧化，从而提供了一种精确的方法来以保持形状的方式减小NC尺寸。 Al NCs的MOF外壳封装可提高等离子体增强的光催化效率，这在氢-氘交换和水煤气变换反应中观察到。
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