Optimization of electron beam-deposited silver nanoparticles on zinc oxide for maximally surface enhanced Raman spectroscopy

Cook, Andrew L.; Haycook, Christopher P.; Locke, Andrea K.; Mu, R.; Giorgio, Todd D.

doi:10.1039/d0na00563k

Cited by 3 publications

(1 citation statement)

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“…Silver and gold nanoparticles have been the subject of many research efforts, motivated by their application in various fields like plasmonics, sensing, and drug delivery. Here, Ag nanoparticles have shown a higher scattering efficiency than Au [25], thus becoming the preferred candidates for plasmon based solar cells [26] and surface enhanced Raman scattering [27]. It is important to note that the thermodynamic properties of Ag nanoparticles, such as the melting temperature and heat of fusion, strongly depend on their size and might cause further and various ion-induced effects [28,29].…”

Section: Introductionmentioning

confidence: 99%

The disappearance and return of nanoparticles upon low energy ion irradiation

et al. 2021

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Ion irradiation of bulk and thin film materials is tightly connected to well described effects such as sputtering or/and ion beam mixing. However, when a nanoparticle is ion irradiated and the ion range is comparable to the nanoparticle size, these effects are to be reconsidered essentially. This study investigates the morphology changes of silver nanoparticles on top of silicon substrates, being irradiated with Ga+ ions in an energy range from 1 to 30 keV. The hemispherical shaped nanoparticles become conical due to an enhanced and curvature-dependent sputtering, before they finally disappear. The sputter yield and morphology changes can be well described by 3D Monte Carlo TRI3DYN simulations. However, the combination of sputtering, ion beam mixing, ion beam induced diffusion, and Ostwald ripening at ion energies lower than 8 keV results in the reappearance of new particles. These newly formed nanoparticles appear in various structures depending on the material and ion energy.

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