Formation of Au nanocluster ordered array on Si(111)‐7 × 7 surface

Qu, Bo; Hu, Jin-Hang; Li, Hang; Li, Wenjie; Huang, M.; Wu, Qi‐Hui

doi:10.1002/sia.5791

Surface & Interface Analysis

2015

DOI: 10.1002/sia.5791

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Formation of Au nanocluster ordered array on Si(111)‐7 × 7 surface

Bo Qu

Jin-Hang Hu

Hang Li

et al.

Abstract: We report a successful approach in fabricating well shape two‐dimensional Au nanocluster hexagonal array on an Si(111)‐7 × 7 surface. The size of Au hexagons is about 2.5 × 2.5 nm2. The easiness of preparing large scale Au hexagonal array makes this approach usable to fabricate a wide range of other metal nanocluster arrays. Further deposition of small amount of Au nanoclusters on the Au hexagonal array surface will prefer to occupy the holes of the hexagonal array at room temperature. Finally, a reasonable st… Show more

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Cited by 2 publications

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Measurement of local contact potential difference of atomic scale Au/Si(111)-(7×7) delocalized adsorption state in room-temperature and ultra-high vacuum environment

王慧云¹,

冯婕²,

王旭东³

et al. 2022

Acta Phys. Sin.

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The structural properties and local contact potential difference of Au on Si(111)-(7×7) surface were studied by self-made ultra-high vacuum non-contact Kelvin probe force microscope. Although scanning tunneling microscopy has been widely used to study metal adsorbed semiconductor surfaces on the atomic scale, the tunnel current measured by scanning tunneling microscopy is easy to lead to accidental switching of charge states in the measurement process, and it is only limited to the observation of metal and semiconductor surfaces. Kelvin probe force microscope allows us to directly measure the charges at different positions of various flat surfaces by local contact potential difference at the atomic scale, which has become a more convenient and accurate means of charge characterization. In this paper, the topography and local contact potential difference atomic scale of Au adsorbed Si(111)-(7×7) surface were measured by Kelvin probe force microscope at room temperature, and the corresponding adsorption model and first principle calculation were established. The differential charge density distribution of the stable adsorption position of Au/Si(111)-(7×7) was obtained, and the local contact potential difference relationship of the stable adsorption position of Au on Si surface was given, The mechanism of charge transfer between Au atom and Si(111)-(7×7) surface during adsorption was analyzed. The experimental results show that at room temperature, single Au atom will form triangular delocalized adsorption state in the half unit cells of Si(111)-(7×7). The delocalized adsorption state are due to the moving speed of a single Au atom in the HUC is faster than the scanning speed of Kelvin probe force microscope, and the local contact potential difference measurement of Au/Si(111)-(7×7) adsorbed surface can effectively identify Au and Si atoms. Obviously, this research is of great significance to promote the development of surface charge precision measurement, and is expected to provide some insights into the charge properties of metal adsorbed semiconductor surfaces.

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Measurement of local contact potential difference of atomic scale Au/Si(111)-(7×7) delocalized adsorption state in room-temperature and ultra-high vacuum environment

王慧云¹,

冯婕²,

王旭东³

et al. 2022

Acta Phys. Sin.

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Measurement of distribution of charge adsorbed on Au<i><sub>x</sub></i>/Si(111)-7×7 surface on an atomic scale in ultra-high vacuum

Feng¹,

Guo²,

Peng-Li³

et al. 2023

Acta Phys. Sin.

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The physicochemical properties of Au atoms adsorbed on the surface of the atomic scale play a very important role in the preparation of nanodevices and surface catalysis. In this paper, we used Frequency Modulated Kelvin probe force microscopy （FM-KPFM）to study the multi-bit adsorbed charge distribution of Au on the surface of Si(111)-(7×7) at room temperature. Firstly, the surface topography and local contact potential difference (LCPD) of Au at different adsorption sites in Si(111)-(7×7) were successfully obtained by using self-made ultra-high vacuum Kelvin probe force microscopy. Secondly, we analyzed the atomic characteristics of specific atomic positions of Au/Si(111)-(7×7) by force spectroscopy and potential difference, and atomic identification was realized. The adsorption characteristics of Au/Si(111)-(7×7) surface charge transfer and Au were explained by combining differential charge density calculations. The results showed that Au atom adsorption mainly had single atom and cluster forms. Among them, the Au cluster is adsorbed in a hexagonal structure of six atoms in the three of Si(111)-(7×7). Individual Au atoms are adsorbed to the central adatoms of Si(111)-(7×7). At the same time, through the measurement of potential difference, it is known that a single Au atom and Au cluster lose electrons and have a positive electrical characteristic. The results of surface differential charge density show that Au undergoes charge transfer during adsorption and loses part of the charge, which locally reduces the work function at the position of the adsorbed atom. In the range of distances where short-range forces, local contact potential energy differences and differential charge densities change, reasonable agreement between theory and experiment is obtained.

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Formation of Au nanocluster ordered array on Si(111)‐7 × 7 surface

Cited by 2 publications

References 35 publications

Measurement of local contact potential difference of atomic scale Au/Si(111)-(7×7) delocalized adsorption state in room-temperature and ultra-high vacuum environment

Measurement of local contact potential difference of atomic scale Au/Si(111)-(7×7) delocalized adsorption state in room-temperature and ultra-high vacuum environment

Measurement of distribution of charge adsorbed on Au<i><sub>x</sub></i>/Si(111)-7×7 surface on an atomic scale in ultra-high vacuum

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