| Abstract
| - The tuning of electron affinity and secondary electron emission on diamond (100) surfaces due to cycloadditionwith 1,3-butadiene is investigated by photoemission experiments and density functional theory (DFT) calculations.A significant reduction in electron affinity up to 0.7 eV and enhancement of secondary electron emission were observedafter 1,3-butadiene adsorption. The lowering of vacuum level via 1,3-butadiene adsorption is supported by DFTcalculations. The C−H bonds in the covalently bonded organics on diamond contribute to the enhanced secondaryelectron emission and reduced electron affinity in a mechanism similar to that of C−H bonds on hydrogenated diamondsurfaces. This combination of strong secondary emission and low electron affinity by the organic functionalizationof diamond has potential applications in diamond-based molecular electronic devices.
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