Plasma induced enhancements in plasmonic sensitivity of sputter-deposited silver nanoparticles to ethanol vapor

Abstract

Localized surface plasmon resonances (LSPRs) of silver nanoparticles (Ag NPs) are attractive and useful phenomena for many potential applications. This work employed Ar plasma treatments to modify the LSPR characteristics of Ag NPs for plasmonic sensing applications. A brief plasma exposure eliminated the surface contamination on Ag NPs retaining their morphologies. Ag NPs having such morphologies brought about a broad LSPR spectrum that is unfavorable for plasmonic sensing. Ar plasma exposure for ∼300 s induced Ostwald ripening, isolation and growth of Ag NPs, resulting in a sharp LSPR spectrum. In terms of plasmonic sensing based on the figure of merit, a narrower spectrum with larger peak-shift upon the analyte molecules is required.

Carrier density tuning in CuS nanoparticles and thin films by Zn doping via ion exchange

“…A very small reduction of the FWHM can be related to Ostwald ripening inducing a smaller size dispersion for the annealed nanoparticles. 38…”

“…A very small reduction of the FWHM can be related to Ostwald ripening inducing a smaller size dispersion for the annealed nanoparticles. 38 The dependence of the LSP position on the Zn concentration in the nanoparticles is indicative of the changes in the hole density in the nanoparticles upon Zn doping. The hole concentration decreases when Zn substitutes Cu, resulting in the lower plasma frequency and, therefore, the long-wavelength shift of the LSP resonance which depends on the plasma frequency.…”

Boosting performance of Mn1.56Co0.96Ni0.48O4 film bolometer using randomly distributed nanostructures

“…Recently, plasmonic enhancements by the introduction of metallic nanoparticles or periodic metallic nanostructures have been promising platforms for various biosensing devices. [23][24][25][26][27] In a previous study, plasmonic nanostructures are mainly focused on metallic patterns with rigorous geometrical precision requirements. Although this method achieves considerable efficiency enhancements in the experiments, the metallic nanostructures are fabricated complexly and expensively by stateof-the-art techniques such as focused ion beam, 28) electronbeam lithography, 29) or high-resolution photolithography.…”