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- W2183674688 abstract "To create high current, long lasting electron sources capable of providing sub-ps bunches, new photocathode concepts are sought. Most recently, plasmonic nanostructured metal surfaces or flat metal surfaces activated by an ultrathin MgO are under great attention. We report on a photocathode design combining these two approaches. It consists of plasmonic Ag nanoparticles (NPs) functionalized by 3 MgO monolayers (MLs). Ag NPs were synthesized by an aerosol method and MgO was grown by atomic layer deposition (ALD). The NPs geometry was tuned to obtain broadband >50% absorption in the entire blue range as evidenced by UVvis. spectroscopy. The work function (WF) of 3 MgO MLs/Ag NPs multilayer was reduced by 1 eV compared to bare NPs, from 5 to 4 eV, as evidenced by UPS and Kelvin probe. Reduction by 1 eV is maximal for this pair of materials, and agrees well with experimental and theoretical findings. While the effect on WF is indeed significant, a special handling protocol for Ag before depositing MgO is a must. It would preserve a clean Ag surface with a WF of nearly 4 eV to achieve 3 eV upon ALD of MgO. This and other issues are under study to promote photocathode applications." @default.
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- W2183674688 date "2014-01-01" @default.
- W2183674688 modified "2023-10-16" @default.
- W2183674688 title "METAL PLASMONIC NANOSTRUCTURES FUNCTIONALIZED BY ATOMIC LAYER DEPOSITION OF MgO FOR PHOTOCATHODE APPLICATIONS" @default.
- W2183674688 doi "https://doi.org/10.18429/jacow-ipac2014-mopri058" @default.
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