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| - Toward a Thermally Robust Operando Surface-Enhanced Raman Spectroscopy Substrate
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| - The work presented here describes the first steps toward designing a thermally robust surface-enhanced Ramanspectroscopy (SERS) substrate with the potential to conduct in situ monitoring of catalytic reactions. Nanospherelithography (NSL) fabricated SERS substrates were coated with thin (0.2−1.0 nm) films of atomic layerdeposited (ALD) Al2O3. The thermal stability of these substrates was examined at various temperatures (100−500 °C) and over time (up to 6 h) in nitrogen. The results showed that ALD Al2O3 coated nanoparticlesmaintained their original geometry significantly better than the bare Ag nanoparticles. While experimentsshowed that thicker ALD Al2O3 coatings resulted in the most stable nanoparticle structure, ALD Al2O3 coatingsas thin as 0.2 nm resulted in thermally robust nanostructures as well. Additionally, the ALD Al2O3 coatednanoparticles were heated under propane to mimic reaction conditions. These experiments showed that whilethe nanoparticle geometries were not as stable under reducing atmosphere conditions, they were much morestable than uncoated nanoparticles and therefore have the potential to be used for SERS monitoring of reactionsconducted at elevated temperatures.
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