STM study of site selective hydrogen adsorption on Si(111)<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>7</mml:mn><mml:mo>×</mml:mo><mml:mn>7</mml:mn></mml:mrow></mml:math>

Razado, I. C.; Zhang, Hanmin; Uhrberg, R. I. G.; Hansson, G. V.

doi:10.1103/physrevb.71.235411

Cited by 17 publications

(17 citation statements)

References 17 publications

(19 reference statements)

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“…The hydrogen adsorption and its energetics on the Si(111)-(7×7) surface has been extensively studied before, both experimentally and theoretically, in Refs. [36][37][38]. It has been demonstrated that the H atoms preferentially reside on the rest atom sites.…”

Section: A Nc-afm Imaging Of H Atoms On Si(111)-(7×7)mentioning

confidence: 99%

Force mapping on a partially H-covered Si(111)-(7×7) surface: Influence of tip and surface reactivity

et al. 2013

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We report force mapping experiments on Si(111)-(7×7) surfaces with adsorbed hydrogen, using atomic force microscopy at room temperature supported by density functional theory (DFT) simulations. On the basis of noncontact atomic force microscopy (NC-AFM) images as well as force versus distance curves measured over both hydrogen-passivated and bare Si adatoms, we identified two types of tip termination, which result in different modes of interaction with the surface. The statistics of the tip dependence of the measured forces, which are effectuated using various tip states with different cantilevers, reveal the typical values of the force and their distribution in the two characteristic interaction modes. The experimental results are corroborated by DFT calculations performed for different tip structures. As a reactive tip, the dimer-terminated Si tip yields results in satisfactory agreement with experimental force curves for hydrogen-passivated and nonpassivated Si adatom sites. An oxidized Si dimer tip that bears a hydroxyl group on its apex reproduces well the experimental force curves acquired by nonreactive tips. This tip model could thus be used to interpret the experimentally obtained weak image contrast for the Si(111)-(7×7) surface. The forces are thought to arise as a result of a weak electrostatic interaction involving a permanent dipole at the tip apex enhanced by the charge density redistribution due to the interaction with surface adatoms.

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Section: A Nc-afm Imaging Of H Atoms On Si(111)-(7×7)mentioning

confidence: 99%

Force mapping on a partially H-covered Si(111)-(7×7) surface: Influence of tip and surface reactivity

et al. 2013

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“…Not only STM image of adatoms but also the tunneling spectroscopy at the rest atom position suggests that the CH 3 OH molecule dissociates in a Si adatom to form Si-OCH 3 and in a rest Si atom to form Si-H, respectively [ 10 ]. These facts indicate that the dissociation of alcohol is accomplished via a precursor state in each half unit cell: That is, each half unit cell works independently as if it was a molecule.…”

Section: Resultsmentioning

confidence: 99%

“…This surface is constituted by two types of equilateral triangles, which are referred to as an unfaulted half unit cell and a faulted half unit cell [ 9 ]. Along with these triangles, the detailed atomic position theory has been established [ 10 ]: Adsorption sites are divided into the center sites, corner sites and rest sites. In this paper, the meticulous preparation of a regular structure is desired not only for the fundamental studies, but also for the application of high-density magnetic memory thin film.…”

Section: Introductionmentioning

confidence: 99%

“…In order to preserve the magnetic property of iron, this paper tended to focus on CH 3 OH [ 14 , 15 ]. Through the mass spectrometer equipment and an external heater, some previous assumptions (such as the saturated ratio) were verified [ 8 , 10 ]. As an intermediate layer which iron was deposited on, the specific adsorption model should be explored more deeply.…”

Section: Introductionmentioning

confidence: 99%

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Study on Formation Process and Models of Linear Fe Cluster Structure on a Si(111)-7 × 7-CH3OH Surface

Ding

et al. 2018

Materials

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STM results showed that Fe atoms were deposited on a Si(111)-7 × 7 reconstructed surface, which was saturated with CH3OH molecules. Fe atomic linear structure was composed of stable clusters and in-situ observed by the scanning tunneling microscopy (STM). The aim to improve its application of magnetic memory material, both formation process and models, has been explored in this paper. By combining surface images and mass spectrometer data, an intermediate layer model was established. In terms of thermal stability, the most favorable adsorption sites of CH3OH were further explored. After that, Fe atoms were deposited on the Si(111)-7 × 7-CH3OH surface, forming a linear cluster structure. On the one hand, a new Fe cluster model was put forward in this paper, which was established with height measurement and 3D surface display technology. This model is also affected by the evaporation temperature, which can be consistent with the atomic stacking pattern of face centered cubic structures. On the other hand, the slight height change suggested the stability of linear structures. Even in the condition of thin air introduction, Fe cluster showed a good performance, which suggested the possibility of magnetic memory application in the future. These investigations are believed to have, to a certain extent, increased the probability of forming Fe linear clusters on the surface of silicon substrate, especially according to the models and surface technology we adjusted.

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“…In this study, through the observation and comparison of the alcohol gases’ dissociation process, we have a deeper understanding of the CH 3 OH adsorption mechanism. Homo-atomic molecules such as H 2 , O 2 and N 2 give one kind of adsorbed species, but hetero-atomic molecules (like CH 3 OH, C 2 H 5 OH and C 3 H 7 OH) provide two or more forms of adsorbed species or surface characteristics [ 13 , 14 , 15 ]. The dissociation of C n H 2n +1 OH adsorption on the Si (111)-7 × 7 surface is a prominent example, where the new bonds (Si-H) and (Si-C n H 2n+1 O) are formed by the reaction between the alcohol gases and Si atoms.…”

Section: Introductionmentioning

confidence: 99%

Exploring the Dual Characteristics of CH3OH Adsorption to Metal Atomic Structures on Si (111)-7 × 7 Surface

Wang

Ding

et al. 2021

Molecules

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Metal atoms were deposited on an Si (111)-7 × 7 surface, and they were adsorbed with alcohol gases (CH3OH/C2H5OH/C3H7OH). Initially, CnH2n+1OH adsorption was simply used as an intermediate layer to prevent the chemical reaction between metal and Si atoms. Through scanning tunneling microscopy (STM) and a mass spectrometer, the CnH2n+1OH dissociation process is further derived as the construction of a surface quasi-potential with horizontal and vertical directions. With the help of three typical metal depositions, the surface characteristics of CH3OH adsorption are more clearly presented in this paper. Adjusting the preheating temperature, the difference of thermal stability between CH3O– and H+ could be obviously derived in Au deposition. After a large amount of H+ was separated, the isolation characteristic of CH3O– was discussed in the case of Fe deposition. In the process of building a new metal-CH3O–-H+ model, the dual characteristics of CH3OH were synthetically verified in Sn deposition. CH3O– adsorption is prone to influencing the interaction between the metal deposition and substrate surface in the vertical direction, while H+ adsorption determines the horizontal behavior of metal atoms. These investigations lead one to believe that, to a certain extent, the formation of regular metal atomic structures on the Si (111)-7 × 7-CH3OH surface is promoted, especially according to the dual characteristics and adsorption models we explored.

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STM study of site selective hydrogen adsorption on Si(111)7×7

Cited by 17 publications

References 17 publications

Force mapping on a partially H-covered Si(111)-(7×7) surface: Influence of tip and surface reactivity

Force mapping on a partially H-covered Si(111)-(7×7) surface: Influence of tip and surface reactivity

Study on Formation Process and Models of Linear Fe Cluster Structure on a Si(111)-7 × 7-CH3OH Surface

Exploring the Dual Characteristics of CH3OH Adsorption to Metal Atomic Structures on Si (111)-7 × 7 Surface

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