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ALD Functionalized Nanoporous Gold: Thermal Stability, Mechanical Properties, and Catalytic Activity

doi: 10.1021/nl200993g
pmid: 21732623
Nanoporous metals have many technologically promising applications, but their tendency to coarsen limits their long-term stability and excludes high temperature applications. Here, we demonstrate that atomic layer deposition (ALD) can be used to stabilize and functionalize nanoporous metals. Specifically, we studied the effect of nanometer-thick alumina and titania ALD films on thermal stability, mechanical properties, and catalytic activity of nanoporous gold (np-Au). Our results demonstrate that even only 1 nm thick oxide films can stabilize the nanoscale morphology of np-Au up to 1,000°C, while simultaneously making the material stronger and stiffer. The catalytic activity of np-Au can be drastically increased by TiO(2) ALD coatings. Our results open the door to high-temperature sensor, actuator, and catalysis applications and functionalized electrodes for energy storage and harvesting applications.
- University of North Texas United States
- University of Bremen Germany
- Lawrence Berkeley National Laboratory United States
- University of North Texas United States
- Lawrence Berkeley National Laboratory United States
Morphology, Organic, 36 Materials Science, Oxides, Energy Storage, Catalysis, 37 Inorganic, Coatings, Physical And Analytical Chemistry, Mechanical Properties, Harvesting, Gold, Deposition, Doors, Stability, Electrodes
Morphology, Organic, 36 Materials Science, Oxides, Energy Storage, Catalysis, 37 Inorganic, Coatings, Physical And Analytical Chemistry, Mechanical Properties, Harvesting, Gold, Deposition, Doors, Stability, Electrodes
citations This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).216 popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.Top 1% influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).Top 10% impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.Top 1%
