FI-STM investigation of fullerenes adsorbed on the semiconductor and metal surfaces

Tomihiro Hashizume; Toshio Sakurai

FI-STM investigation of fullerenes adsorbed on the semiconductor and metal surfaces

Tomihiro Hashizume, Toshio Sakurai

Research output: Contribution to journal › Article › peer-review

Abstract

Our systematic investigation using field-ion scanning tunneling microscopy (FI-STM) is reviewed for the adsorption and film growth of fullerenes (C ₆₀, C ₇₀, C ₈₀, and C ₈₄) and metallofullerenes (Sc@C ₇₄/Sc ₂@C ₇₄, Sc ₂@C ₈₄, Y@C ₈₂, and Gd@C ₈₂) on the Si(100)-2x1, Si(111)-7x7, GaAs(001)-2x4-As, Cu(111)1x1, and Ag(111)1x1 surfaces. The fullerene molecules are stable on the Si(100)-2x1 and Si(111)-7x7 surfaces at room temperature because of the strong bonding to the substrate dangling bonds. As a result, unique intramolecular structures of C ₆₀ molecule are observed. The STM images of the C ₈₄, Sc@C ₇₄/Sc ₂@C ₇₄, and Sc ₂@C ₈₄ molecules are used to draw information on the molecular structures. In contrast to the Si surfaces, the fullerene molecules are mobile on the terrace of the metal surfaces and initially segregate to the step. A well-ordered two dimensional overlayer forms with a close-packed arrangement upon annealing the fullerene covered surfaces. On the Cu(111) surface, the commensurate (4x4) phase forms for the cases of the C ₆₀, C ₇₀ and C _60(X)C _70(1-X) adsorption, indicating a strong interaction between the Cu substrate and fullerenes. Beautiful intramolecular structures of the C ₆₀ and C ₇₀ molecules are observed and are interpreted as the local mappings of the electron density of states. One-dimensional cluster formation of C ₆₀, Y@C ₈₂, and Gd@C ₈₂ on the step of the Cu(111)-1x1 surface is analyzed and the preferential dimer formation is only observed for the case of Y@C ₈₂, which is attributed to the interaction between the unpaired electrons of the Y@C ₈₂ molecules. On the Ag(111) surface, the C ₆₀ and Sc ₂@C ₈₄ monolayer films show several phases that have an almost identical nearest neighbour distance but are rotated from each other. Among the systems studied, C ₆₀ on the GaAs(001)-2x4-As surface shows a unique highly-strained fcc(110)-oriented multi-layer film growth, while all other systems show the well-known fcc(111)-oriented multi-layer growth.

Original language	English
Pages (from-to)	17-45
Number of pages	29
Journal	Science Reports of the Rerearch Institutes Tohoku University Series A-Physics
Volume	44
Issue number	1
Publication status	Published - 1997

Keywords

Adsorption
C
Film growth
Fullerenes
Metal
STM
Semiconductor

ASJC Scopus subject areas

Condensed Matter Physics
Metals and Alloys

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title = "FI-STM investigation of fullerenes adsorbed on the semiconductor and metal surfaces",

abstract = "Our systematic investigation using field-ion scanning tunneling microscopy (FI-STM) is reviewed for the adsorption and film growth of fullerenes (C 60, C 70, C 80, and C 84) and metallofullerenes (Sc@C 74/Sc 2@C 74, Sc 2@C 84, Y@C 82, and Gd@C 82) on the Si(100)-2x1, Si(111)-7x7, GaAs(001)-2x4-As, Cu(111)1x1, and Ag(111)1x1 surfaces. The fullerene molecules are stable on the Si(100)-2x1 and Si(111)-7x7 surfaces at room temperature because of the strong bonding to the substrate dangling bonds. As a result, unique intramolecular structures of C 60 molecule are observed. The STM images of the C 84, Sc@C 74/Sc 2@C 74, and Sc 2@C 84 molecules are used to draw information on the molecular structures. In contrast to the Si surfaces, the fullerene molecules are mobile on the terrace of the metal surfaces and initially segregate to the step. A well-ordered two dimensional overlayer forms with a close-packed arrangement upon annealing the fullerene covered surfaces. On the Cu(111) surface, the commensurate (4x4) phase forms for the cases of the C 60, C 70 and C 60(X)C 70(1-X) adsorption, indicating a strong interaction between the Cu substrate and fullerenes. Beautiful intramolecular structures of the C 60 and C 70 molecules are observed and are interpreted as the local mappings of the electron density of states. One-dimensional cluster formation of C 60, Y@C 82, and Gd@C 82 on the step of the Cu(111)-1x1 surface is analyzed and the preferential dimer formation is only observed for the case of Y@C 82, which is attributed to the interaction between the unpaired electrons of the Y@C 82 molecules. On the Ag(111) surface, the C 60 and Sc 2@C 84 monolayer films show several phases that have an almost identical nearest neighbour distance but are rotated from each other. Among the systems studied, C 60 on the GaAs(001)-2x4-As surface shows a unique highly-strained fcc(110)-oriented multi-layer film growth, while all other systems show the well-known fcc(111)-oriented multi-layer growth.",

keywords = "Adsorption, C, Film growth, Fullerenes, Metal, STM, Semiconductor",

author = "Tomihiro Hashizume and Toshio Sakurai",

year = "1997",

language = "English",

volume = "44",

pages = "17--45",

journal = "Science Reports of the Rerearch Institutes Tohoku University Series A-Physics",

issn = "0040-8808",

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number = "1",

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TY - JOUR

T1 - FI-STM investigation of fullerenes adsorbed on the semiconductor and metal surfaces

AU - Hashizume, Tomihiro

AU - Sakurai, Toshio

PY - 1997

Y1 - 1997

N2 - Our systematic investigation using field-ion scanning tunneling microscopy (FI-STM) is reviewed for the adsorption and film growth of fullerenes (C 60, C 70, C 80, and C 84) and metallofullerenes (Sc@C 74/Sc 2@C 74, Sc 2@C 84, Y@C 82, and Gd@C 82) on the Si(100)-2x1, Si(111)-7x7, GaAs(001)-2x4-As, Cu(111)1x1, and Ag(111)1x1 surfaces. The fullerene molecules are stable on the Si(100)-2x1 and Si(111)-7x7 surfaces at room temperature because of the strong bonding to the substrate dangling bonds. As a result, unique intramolecular structures of C 60 molecule are observed. The STM images of the C 84, Sc@C 74/Sc 2@C 74, and Sc 2@C 84 molecules are used to draw information on the molecular structures. In contrast to the Si surfaces, the fullerene molecules are mobile on the terrace of the metal surfaces and initially segregate to the step. A well-ordered two dimensional overlayer forms with a close-packed arrangement upon annealing the fullerene covered surfaces. On the Cu(111) surface, the commensurate (4x4) phase forms for the cases of the C 60, C 70 and C 60(X)C 70(1-X) adsorption, indicating a strong interaction between the Cu substrate and fullerenes. Beautiful intramolecular structures of the C 60 and C 70 molecules are observed and are interpreted as the local mappings of the electron density of states. One-dimensional cluster formation of C 60, Y@C 82, and Gd@C 82 on the step of the Cu(111)-1x1 surface is analyzed and the preferential dimer formation is only observed for the case of Y@C 82, which is attributed to the interaction between the unpaired electrons of the Y@C 82 molecules. On the Ag(111) surface, the C 60 and Sc 2@C 84 monolayer films show several phases that have an almost identical nearest neighbour distance but are rotated from each other. Among the systems studied, C 60 on the GaAs(001)-2x4-As surface shows a unique highly-strained fcc(110)-oriented multi-layer film growth, while all other systems show the well-known fcc(111)-oriented multi-layer growth.

AB - Our systematic investigation using field-ion scanning tunneling microscopy (FI-STM) is reviewed for the adsorption and film growth of fullerenes (C 60, C 70, C 80, and C 84) and metallofullerenes (Sc@C 74/Sc 2@C 74, Sc 2@C 84, Y@C 82, and Gd@C 82) on the Si(100)-2x1, Si(111)-7x7, GaAs(001)-2x4-As, Cu(111)1x1, and Ag(111)1x1 surfaces. The fullerene molecules are stable on the Si(100)-2x1 and Si(111)-7x7 surfaces at room temperature because of the strong bonding to the substrate dangling bonds. As a result, unique intramolecular structures of C 60 molecule are observed. The STM images of the C 84, Sc@C 74/Sc 2@C 74, and Sc 2@C 84 molecules are used to draw information on the molecular structures. In contrast to the Si surfaces, the fullerene molecules are mobile on the terrace of the metal surfaces and initially segregate to the step. A well-ordered two dimensional overlayer forms with a close-packed arrangement upon annealing the fullerene covered surfaces. On the Cu(111) surface, the commensurate (4x4) phase forms for the cases of the C 60, C 70 and C 60(X)C 70(1-X) adsorption, indicating a strong interaction between the Cu substrate and fullerenes. Beautiful intramolecular structures of the C 60 and C 70 molecules are observed and are interpreted as the local mappings of the electron density of states. One-dimensional cluster formation of C 60, Y@C 82, and Gd@C 82 on the step of the Cu(111)-1x1 surface is analyzed and the preferential dimer formation is only observed for the case of Y@C 82, which is attributed to the interaction between the unpaired electrons of the Y@C 82 molecules. On the Ag(111) surface, the C 60 and Sc 2@C 84 monolayer films show several phases that have an almost identical nearest neighbour distance but are rotated from each other. Among the systems studied, C 60 on the GaAs(001)-2x4-As surface shows a unique highly-strained fcc(110)-oriented multi-layer film growth, while all other systems show the well-known fcc(111)-oriented multi-layer growth.

KW - Adsorption

KW - C

KW - Film growth

KW - Fullerenes

KW - Metal

KW - STM

KW - Semiconductor

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