Journal ArticleDOI
Work function measurements on (100) and (110) surfaces of silver
A. W. Dweydari,C. H. B. Mee +1 more
TLDR
In this article, the work functions of the bulk crystals and of silver films formed upon them by auto-epitaxy were determined photoelectrically, and the results support the Smoluchowski correlation of work function with surface atom density.Abstract:
(100) and (110) single crystals of silver were cleaned by electron and argon-ion bombardment in ultra-high vacuum. The work functions of the bulk crystals, and of silver films formed upon them by autoepitaxy, were determined photoelectrically. The bulk crystals had work functions of (4.64 ± 0.02) eV and (4.52 ± 0.02) eV respectively. The effect of the deposition of silver films was to reduce the work function, but continued cycles of deposition and annealing at 500 to 600 K caused the work function to return to a value very close to that of the bulk crystal. An annealed film of silver deposited in stages on a mica substrate at 425 K had a work function of (4.72 ± 0.02) eV, corresponding to that of the (111) silver surface. If the mica remained at room temperature during deposition, the work function was about 4.5 eV. The work function of a thick polycrystalline film of silver on quartz was (4.26 ± 0.02) eV. The results support the Smoluchowski correlation of work function with surface atom density.read more
Citations
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Journal ArticleDOI
The work function of the elements and its periodicity
TL;DR: In the data for the 63 elements, trends that occur simultaneously in both the columns and the rows of the periodic table are shown to be useful in predicting correct values and also for identifying questionable data.
Journal ArticleDOI
A Review on Surface-Enhanced Raman Scattering.
Roberto Pilot,Raffaella Signorini,Christian Durante,Laura Orian,Manjari Bhamidipati,Laura Fabris +5 more
TL;DR: An overview of the most significant aspects of surface-enhanced Raman scattering, and a representative selection of applications in the biomedical field, with direct and indirect protocols is provided.
Journal ArticleDOI
Nanoparticle Silver Catalysts That Show Enhanced Activity for Carbon Dioxide Electrolysis
Amin Salehi-Khojin,Huei Ru Molly Jhong,Brian A. Rosen,Wei Zhu,Sichao Ma,Paul J. A. Kenis,Richard I. Masel +6 more
TL;DR: In this article, the authors show that the rate of CO2 conversion per unit surface area is about 10 times higher on 5 nm silver nanoparticles than on bulk silver even though measurements on single crystal catalysts show much smaller variations in rate.
Journal ArticleDOI
Free-atom-like d states in single-atom alloy catalysts
Mark T. Greiner,Mark T. Greiner,Travis E. Jones,Sebastian Beeg,Sebastian Beeg,Leon Zwiener,Michael Scherzer,Frank Girgsdies,Simone Piccinin,Marc Armbrüster,Axel Knop-Gericke,Robert Schlögl,Robert Schlögl +12 more
TL;DR: An emergent electronic structure in single-atom alloys is shown, whereby weak wavefunction mixing between minority and majority elements results in a free-atom-like electronic structure on the minority element that affords unique adsorption properties important for catalysis.
References
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Journal ArticleDOI
Theory of Metal Surfaces: Charge Density and Surface Energy
Norton D. Lang,Walter Kohn +1 more
TL;DR: In this paper, the theory of the inhomogeneous electron gas, with local exchange and correlation energies, was used to obtain self-consistent electron density distributions and the surface energy was found to be negative for high densities, and the resulting surface energy is in semiquantitative agreement with surface-tension measurements for eight simple metals (Li, Na, K, Rb, Cs, Mg, Zn, Al).
Journal ArticleDOI
The Analysis of Photoelectric Sensitivity Curves for Clean Metals at Various Temperatures
TL;DR: In this paper, an elementary theory for the effect of temperature on the photoelectric sensitivity of a clean metal near the threshold is developed, which is in agreement with the conclusions of Lawrence and Linford based on much less extensive data.
Journal ArticleDOI
Anisotropy of the Electronic Work Function of Metals
TL;DR: In this paper, the authors used the picture of Wigner and Bardeen according to which the work function is a sum of a volume contribution and a contribution due to a double layer on the surface of the metal.
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Theory of Metal Surfaces: Work Function
TL;DR: In this article, the authors presented a contribution to the theory of metal surfaces with emphasis on the shape of the electron density distribution and the surface energy, and extended this analysis to a consideration of the work function.
Journal ArticleDOI
Theory of the Work Function. II. The Surface Double Layer
TL;DR: In this paper, an approximate self-consistent solution of the Fock equations gives the charge density at the surface of a monovalent metal, where the surface barrier is due primarily to exchange and polarization forces, and that ordinary electrostatic forces play a minor role.