Nanoplasmonic Probes of Catalytic Reactions
Nanoplasmonic Probes of Catalytic Reactions
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DOI：
10.1126/science.1176593
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发表时间：
2009-11-20
期刊：
影响因子：
56.9
通讯作者：
Kasemo, Bengt
中科院分区：
文献类型：
--
作者：
Larsson, Elin M.;Langhammer, Christoph;Kasemo, Bengt
多相催化反应的光学探针可以是优化和过程控制的有价值的工具，因为它们可以在现实条件下操作，但通常探针缺乏灵敏度。我们已经开发了一种等离子体传感方法，这种反应的基础上的纳米制造的金盘阵列，覆盖着一个薄（类似于10纳米）涂层（催化剂载体）上沉积的催化剂纳米粒子。传感颗粒通过消光光谱中的峰位移监测催化反应期间反应物表面覆盖度的变化。估计了对低于10（-3）单层的灵敏度。该方法的能力被证明为三个催化反应，CO和H-2氧化的Pt，和NOx转化为N-2的Pt/BaO。
Optical probes of heterogeneous catalytic reactions can be valuable tools for optimization and process control because they can operate under realistic conditions, but often probes lack sensitivity. We have developed a plasmonic sensing method for such reactions based on arrays of nanofabricated gold disks, covered by a thin (similar to 10 nanometer) coating (catalyst support) on which the catalyst nanoparticles are deposited. The sensing particles monitor changes in surface coverage of reactants during catalytic reaction through peak shifts in the optical extinction spectrum. Sensitivities to below 10(-3) monolayers are estimated. The capacity of the method is demonstrated for three catalytic reactions, CO and H-2 oxidation on Pt, and NOx conversion to N-2 on Pt/BaO.