Journal
NANO LETTERS
Volume 18, Issue 3, Pages 1699-1706Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b04739
Keywords
Plasmonics; energetic materials; energy harvesting; laser processing
Categories
Funding
- Department of Energy [DE-FG07-ER46426]
- VILLUM FONDEN [VKR023371]
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Explosives, propellants, and pyrotechnics are energetic materials that can store and quickly release tremendous amounts of chemical energy. Aluminum (Al) is a particularly important fuel in many applications because of its high energy density, which can be released in a highly exothermic oxidation process. The diffusive oxidation mechanism (DOM) and melt-dispersion mechanism (MDM) explain the ways powders of Al nanoparticles (NPs) can burn, but little is known about the possible use of plasmonic resonances in NPs to manipulate photoignition. This is complicated by the inhomogeneous nature of powders and very fast heating and burning rates. Here, we generate Al NPs with well-defined sizes, shapes, and spacings by electron beam lithography and demonstrate that their plasmonic resonances can be exploited to heat and ignite them with a laser. By combining simulations with thermal-emission, electron-, and optical microscopy studies, we reveal how an improved control over NP ignition can be attained.
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