Abstract
Ultraviolet irradiation was used to tailor the surface plasmon band of the densely distributed aluminium nanoparticle arrays fabricated by gas-phase deposition. We showed that the broad surface plasmon resonance band of the as-prepared sample could be tuned to a sharp and strong resonance band in the deep ultraviolet optical range, with a large blue shift of the peak wavelength. The evolution of the surface plasmon resonance properties was attributed to the ultraviolet irradiation-improved surface oxidation of the nanoparticles, which eliminated the near-field couplings between the closely spaced nanoparticles by increasing their interspacing.
Highlights
Aluminium nanoparticles (Al NPs) are of interest to a variety of applications, such as photocatalysts [1], optical coatings [2], and transparent conductive films [3], as well as propellant and explosive materials [4]
As the spectrum displayed small change when measured after several days of atmospheric exposure, the evolution of the surface plasmon resonance (SPR) band in Al NP arrays under UV irradiation might be attributed to the growth of the oxide layers on the NP surfaces inspired by UV light
We have shown that the UV irradiation induced a large blue shift of the SPR band, resulted in a sharp and strong SPR band in the deep ultraviolet (DUV) region, peaked at 232 nm with a full width at half maximum (FWHM) of 20 nm
Summary
Aluminium nanoparticles (Al NPs) are of interest to a variety of applications, such as photocatalysts [1], optical coatings [2], and transparent conductive films [3], as well as propellant and explosive materials [4]. They have been receiving considerable interest lately as plasmonic materials alternative to gold and silver NPs, with their attractive properties such as low cost, high natural abundance, and advantages in device performance, design flexibility, processing, and tenability [5,6,7,8,9,10,11]. Challenges still remain to synthesize well-controlled Al NPs suitable for DUV plasmonic applications
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