The ICR (ionic current rectification) phenomenon in nanopores is influenced by both the shape and material of the nanopore, as well as the ion concentration within the electrolyte that permeates the nanopore. Specifically, nanopores composed of multiple materials can induce ICR due to variations in ion distribution along the nanopore-electrolyte interface across different sections of the material. In this study, we investigate the impact of configurations involving up to two layers of different materials (Si3N4 and Au) and six different electrolytes on solid-state nanoporous ICR. We aim to assess how different configurations of surface charges can influence ICR. The main advantage of nanopores made from gold and other metals may be their use as an ICR amplifier when illuminating nanopores with a wavelength of light lying in the plasmon resonance region of the metal used.
Cu2-xS nanoparticles have the ability to absorb radiation in the near infrared (NIR) range. This is due to localized surface plasmon resonance (LSPR) of free holes in the valence band. This fact makes it possible to use copper sulfide nanoparticles for sensing application in the NIR range. Our study showed that Cu2-xS nanoparticles have a significant localized surface plasmon resonance. The LSPR of nanoparticles was tuned by adjusting the concentrations of Cu and S. In this case, the plasmon peak reaches a maximum at values of about 1210 nm. Thus, highly localized electromagnetic field of Cu2-xS NPs can be successfully applied for to detection of vibrational bands (overtones) of various molecules in the NIR region. We showed the splitting of longitudinal and transverse dipolar resonance modes of Cu1.4S was changed in the presence of NMethylamine molecules.
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