Thin NaCl films on silver (001): island growth and work function

Abstract : The surface work function (WF) and substrate temperature dependence of the NaCl thin-film growth on Ag(001) have been studied by noncontact atomic force microscopy and Kelvin probe force microscopy. In the sub-monolayer range, the NaCl film is composed of large crystalline islands, which decrease in density and increase in size with increasing temperature during deposition. Each island is composed of a large base island 2 monolayers (ML) thick (for T > 343 K), which collects impinging NaCl molecules that form ad-islands on top. Kelvin probe force microscopy (KPFM) measurements show a reduction of the silver WF by $\Delta \varphi =\varphi _{\mathrm {Ag}}-\varphi _{\mathrm {NaCl/Ag}}=0.69\pm 0.03\, \mathrm {eV}$ with no dependence on the film thickness (1–6 ML), in agreement with recent theoretical calculations. The previously observed nanometer-sized moiré pattern on islands that are 45° rotated with respect to the silver lattice could be observed in the scanning tunneling microscopy mode. However, no contrast could be obtained in KPFM images.
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New Journal of Physics, Institute of Physics: Open Access Journals, 2012, 14 (10), pp.103037. 〈10.1088/1367-2630/14/10/103037〉
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Gregory Cabailh, Claude R Henry, Clemens Barth. Thin NaCl films on silver (001): island growth and work function. New Journal of Physics, Institute of Physics: Open Access Journals, 2012, 14 (10), pp.103037. 〈10.1088/1367-2630/14/10/103037〉. 〈hal-00810492〉

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