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| Paper IPM / P / 11573 |
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| Abstract: | |||||
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By co-deposition of RF-Sputtering and RF-PECVD methods and using of Cu target and acetylene gas, we prepared Cu@Cu2O core-shell nanoparticles on the a-C:H thin film at room temperature. Mie absorption of Cu cores, scattering from Cu2O shell and luminescence that raises from carrier transfer in Cu@Cu2O interface were employed to fit whole range of visible extinction spectrum of these core-shells. Cu core size, Cu2O shell thickness and dielectric coefficients of shell and dielectric coefficients of host embedding these nanoparticles were estimated from this fitting. Using parameters which are obtained from fitting, extinction spectrum particularly Localized Surface Plasmon Resonance (LSPR) absorption peak were simulated. From this simulation we find that scattering and luminescence have an important effect on the energy, width and shape of LSPR absorption peak. Also the effect of Cu core size, Cu2O shell thickness, dielectric coefficients of shell and of host on LSPR absorption peak were investigated. It is concluded that the shift of LSPR peak is affected more by the dielectric coefficient shell than Cu core size particularly for Cu core diameter above 4 nm. Also the LSPR absorption peak is damped by decreasing of Cu core size and dielectric coefficient of shell. The energy of LSPR absorption peak is independent from shell thickness and host dielectric coefficient. The LSPR peak is damped by increasing of shell thickness and host dielectric coefficient too. The scattering contribution in extinction spectra was affected more by shell size than dielectric coefficient. These points are important for detection techniques based on LSPR peak.
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