1/1/2024 0 Comments Copper gold core shell lspr![]() An increase in LSPR extinction intensity, followed by a decrease is observed during the oxidation process.Ī phenomenological adaptation of the Valensi-Carter model of metal oxidation was produced in order to consider cases where the fast Cu + diffusion through the Cu 2O layer, compared to O 2-, leads to oxide formation on both Cu 2O interfaces ( i.e., the NKE). The NP structures at different oxidation stages was evaluated by SEM and TEM, while compositional analysis was performed by GIXRD.Īt the experimental conditions, Cu NPs form a initial Cu 2O layer which finally leads to hollow Cu 2O NCs due to a nano Kirkendall effect (NKE). the metal layer may comprise of one layer of gold, one layer of copper. The LSPR peaks at max show the absorption spectra in the range of 508-541 nm wavelengths and hence, absorption peaks are found in the visible region. Ag/Au core/shell nanoparticles are described, which may be used with LSPR. Cu NPs were deposited by a chemical deposition method on glass substrates, 1 and their oxidation kinetics was studied by LSPR during their thermal annealing at intermediate temperatures (100-170✬). Further, broadening in LSPR peaks is found, as the size of core-NiFe NPs increased and optical efficiency increases with Au-shell thickness. It decreases dramatically as the shell thickness increases similar with coated by Ag (Figure 2(d)) and Au (Figure 3(d)) film, clearly in Figure 1. We proposed to evaluate the use of Localized Surface Plasmon Resonance (LSPR) measurements for studying the oxidation kinetics of NPs. Figure 1) that LSPR position appears at around 558 nm, it is easy to observe that decreasing shell thickness to 10, 7, 5, 4 and 3 nm the LSPR peak shifts to 680, 765, 866, 9 nm, respectively. However, Cu NPs suffer from oxidation and corrosion processes which preclude some of these applications. Copper nanoparticles (Cu NPs) represent an inexpensive alternative to more the expensive gold and silver plasmonic NPs, particularly in systems which could require extensive plasmonic surface layers, as in plasmonic solar cells or metal enhanced fluorescence, as well as in (photo)catalysis, conductive inks and as antibacterial agents.
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