Variation of the local work function at steps on metal surfaces studied with STM

Jin, Jia; Inoue, K.; Hasegawa, Yukio; Yang, Weiping; Sakurai, Takeshi

doi:10.1103/physrevb.58.1193

Cited by 112 publications

(82 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The calculated dipole moments for the adsorbed atom (1:23 D=step atom) and the pyramid tip (1:98 D=step atom; see Ref. [4] for details) broadly agree with the results of previous studies on extended steps at metal surfaces (0:16 À 1 D=step atom [11,12]) and increase with decreasing the coordination of surface atoms [13]. We note that this fundamental property of metal surfaces is difficult to describe within continuum approximations to the tip polarization [14], and remained unaccounted for in some recent models of Kelvin probe microscopy [15].…”

supporting

confidence: 87%

Chemical Resolution at Ionic Crystal Surfaces Using Dynamic Atomic Force Microscopy with Metallic Tips

Teobaldi

Lämmle²,

Trevethan

et al. 2011

Phys. Rev. Lett.

View full text Add to dashboard Cite

We demonstrate that well prepared and characterized Cr tips can provide atomic resolution on the bulk NaCl(001) surface with dynamic atomic force microscopy in the noncontact regime at relatively large tip-sample separations. At these conditions, the surface chemical structure can be resolved yet tipsurface instabilities are absent. Our calculations demonstrate that chemical identification is unambiguous, because the interaction is always largest above the anions. This conclusion is generally valid for other polar surfaces, and can thus provide a new practical route for straightforward interpretation of atomically resolved images.

show abstract

supporting

confidence: 87%

Chemical Resolution at Ionic Crystal Surfaces Using Dynamic Atomic Force Microscopy with Metallic Tips

Teobaldi

Lämmle²,

Trevethan

et al. 2011

Phys. Rev. Lett.

View full text Add to dashboard Cite

show abstract

“…The dark appearance of the copper atoms is tentatively explained on the basis of both electronic and geometrical considerations. Copper and gold are characterised by different work functions, 4.93 eV for Cu(111) [19] and 5.35 eV for Au(111) [20]. This work function difference will result in a local redistribution of electron density and a charge compensating electron transfer is likely to occur resulting in a small net charge flow from copper to gold [21][22][23].…”

Section: Resultsmentioning

confidence: 99%

Structure and Reactivity of Cu-doped Au(111) Surfaces

Grillo

Megginson

Christie

et al. 2018

e-J. Surf. Sci. Nanotech.

View full text Add to dashboard Cite

The structure and surface chemistry of ultrathin metallic films of one metal on another are strongly influenced by factors such as lattice mismatch and the formation of near-surface alloys. New morphologies may result with modified chemical properties which in turn open up different routes for molecular adsorption, desorption and surface functionalization, with important consequences in several fields of application.The Cu/Au(111) system has received the attention of many studies, only a few however have been performed in ultra-high vacuum (UHV), using surface sensitive techniques. In this contribution, the room temperature deposition of copper onto the (22× √ 3)-Au(111) surface, from submonolayer to thick film, is investigated using scanning tunnelling microscopy (STM).The onset of copper adsorption is seen to occur preferentially at alternate herringbone elbows, with a preference for hcp sites. With increasing coverage, copper-rich islands exhibit a reconstructed surface reminiscent of the clean Au(111) herringbone reconstruction. Disordered, pseudo-ordered and ordered surface layers are observed upon annealing. Models for the initial adsorption/incorporation mechanism, formation of adlayers and evolution with increasing coverage and annealing are qualitatively discussed. Further, the reactivity of copper-doped Au (111) systems is considered towards the adsorption of organic molecules of interest in nanotechnology and in catalytic applications.

show abstract

“…Therefore, it was simultaneously measured here with the STM topographic image (29,30). The formation of the QWS also leads to an oscillatory LWF, as shown by the red curve in Fig.…”

Section: Correlation Between Surface Reactivity and Local Work Functimentioning

confidence: 96%

Experimental observation of quantum oscillation of surface chemical reactivities

Jiang

et al. 2007

Proc. Natl. Acad. Sci. U.S.A.

126

121

View full text Add to dashboard Cite

Here we present direct observation of a quantum reactivity with respect to the amounts of O2 adsorbed and the rates of surface oxidation as a function of film thickness on ultrathin (2-6 nm) Pb mesas by scanning tunneling microscopy. Simultaneous spectroscopic measurements on the electronic structures reveal a quantum oscillation that originates from quantum well states of the mesas, as a generalization of the Fabry-Pé rot modes of confined electron waves. We expect the quantum reactivity to be a general phenomenon for most ultrathin metal films with broad implications, such as nanostructure tuning of surface reactivities and rational design of heterogeneous catalysts.Pb(111) ͉ quantum size effects ͉ scanning tunneling microscopy ͉ surface reactivity

show abstract

Variation of the local work function at steps on metal surfaces studied with STM

Cited by 112 publications

References 23 publications

Chemical Resolution at Ionic Crystal Surfaces Using Dynamic Atomic Force Microscopy with Metallic Tips

Chemical Resolution at Ionic Crystal Surfaces Using Dynamic Atomic Force Microscopy with Metallic Tips

Structure and Reactivity of Cu-doped Au(111) Surfaces

Experimental observation of quantum oscillation of surface chemical reactivities

Contact Info

Product

Resources

About