Thermal induced transition in the bonding nature of C60 molecules adsorbed on a Si(111)–(7×7) surface

Sakamoto, Kazuyuki; Kondo, Daiyu; Ushimi, Yoshimitsu; Harada, Masashi; Kimura, Akio; Kakizaki, Akito; Suto, Shozo

doi:10.1016/s0368-2048(98)00501-5

Cited by 6 publications

(4 citation statements)

References 15 publications

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“…This fact implies that the HOMO-LUMO gap of the anchor C60 molecule is smaller than that of the pristine C60 molecule. This consideration is qualitatively consistent with the preceding conclusion that the C60 molecule is covalently bond to the PDA nanowire, because it is known that the HOMO-LUMO gap of a C60 molecule decreases by covalent bonding with surfaces 38,39 or other molecular species, 39 which originates from splitting of HOMO and/or LUMO levels owing to impairing the symmetrical molecular structure.…”

Section: Resultssupporting

confidence: 90%

Nanojunction between Fullerene and One-Dimensional Conductive Polymer on Solid Surfaces

et al. 2014

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Bottom-up creation of huge molecular complexes by covalently interconnecting functional molecules and conductive polymers is a key technology for constructing nanoscale electronic circuits. In this study, we have created an array of molecule-polymer nanojunctions from C60 molecules and polydiacetylene (PDA) nanowires at designated positions on solid surfaces by controlling self-assemblies and intermolecular chemical reactions of molecular ingredients predeposited onto the surfaces. In the proposed method, the construction of each nanojunction spontaneously proceeds via two types of chemical reactions: a chain polymerization among self-assembled diacetylene compound molecules for creating a single PDA nanowire and a subsequent cycloaddition reaction between the propagating forefront part of the PDA backbone and a single C60 molecule adsorbed on the surface. Scanning tunneling microscopy has proved that the C60 molecule is covalently connected to each end of the π-conjugated PDA backbone. Furthermore, the decrease in the energy gap of the C60 molecule in nanojunctions is observed as compared with that of pristine C60 molecules, which is considered to be due to the covalent interaction between the PDA edge and the C60 molecule.

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Section: Resultssupporting

confidence: 90%

Nanojunction between Fullerene and One-Dimensional Conductive Polymer on Solid Surfaces

et al. 2014

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“…This assumption is supported by the results obtained when Ta@Si 16 was deposited on a C 60 /Si(111)7 × 7 surface. The left and right panels in Figure a, respectively, show wide- and molecular-scale STM images of a C 60 -terminated Si(111)7 × 7 surface taken after sparsely depositing Ta@Si 16 cations at ∼90 K. In the C 60 -terminated Si(111)7 × 7 surface, each C 60 molecule (e.g., the dashed green circle in the right panel of Figure a) exhibits internal structures, showing that the rotational motion of the C 60 molecules is forbidden by covalent interactions between the C 60 molecules and the reactive dangling bonds on the Si(111)7 × 7 surface. , Figure b,c shows histograms of the dot heights measured on the Ta@Si 16 + -deposited C 60 /Si(111)7 × 7 surface after thermal annealing at RT and 773 K, respectively. Interestingly, the height distribution of the dots formed on the C 60 /Si(111)7 × 7 surface was nearly maintained even after annealing at 773 K.…”

Section: Resultsmentioning

confidence: 99%

Heterodimerization via the Covalent Bonding of Ta@Si₁₆ Nanoclusters and C₆₀ Molecules

Nakaya

Iwasa

Tsunoyama³

et al. 2015

J. Phys. Chem. C

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Initial products prepared via the surface immobilization of Ta-atom-encapsulated Si 16 cage (Ta@Si 16 ) nanoclusters on solid surfaces terminated with monolayer films of C 60 molecules were investigated using scanning tunneling microscopy (STM). The STM results indicated that marked aggregation and desorption of surface-immobilized Ta@Si 16 nanoclusters were not induced, even after thermal annealing at ∼500 K, whereas the local vertical and lateral positions of the Ta@Si 16 nanoclusters with respect to neighboring adsorption sites in the C 60 film were modified. This local positional transition occurred on C 60 monolayer films weakly bonded (via van der Waals forces) to substrates such as highly oriented pyrolytic graphite (HOPG) but did not occur on C 60 monolayer films covalently bonded to substrates such as Si(111)7 × 7. These results indicated that the heterodimer consisting of a Ta@Si 16 nanocluster and a C 60 molecule, Ta@Si 16 −C 60 , was formed as an initial product via covalent bonding, which inhibited wide-range surface migration of the Ta@Si 16 nanoclusters but allowed them to locally change their positions via thermally activated precessional motion. In addition, the transition temperature of the local positional shift was found to decrease as the area density of the surface-immobilized Ta@Si 16 nanoclusters increased, indicating that the barrier height of the precessional motion of the Ta@Si 16 −C 60 heterodimer was decreased due to accumulation of the elastic strain energy generated in the C 60 films.

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“…The bonding nature has been well studied, for example in ref. 28. The electronic structure and the temperature dependence of C 60 molecules adsorbed on a Si(111)-(7Â7) surface has been investigated using photoelectron spectroscopy.…”

Section: Resultsmentioning

confidence: 99%

“…The pair-wise interaction energy (140 meV) is estimated by assuming thermal equilibrium following the method described in ref. 28. In the same reference, the authors discuss the deviation of the estimated pair-wise interaction energy from the value estimated based on the bulk sublimation energy.…”

Section: Resultsmentioning

confidence: 99%

Scanning Tunneling Microscopy/Spectroscopy of La₂@C₇₂ Multilayer Islands on Si(100)-2×1-H Surfaces

Taninaka

Kato

Shino

et al. 2005

Jpn. J. Appl. Phys.

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A qLalitative stLdy of the phase shifis in coplanar waveguides (cms) with various periodically patlernea conauctive top covers is assessed experimentally. An increase in the dynamic range of tne phase Shih has been ObSeNeO by altering the CWI between needle4ke-patterned and uniform conductive top structures. A CPW with a fine-patterned top cover coated with CdS material was examined to demonstrate the potent.al applicat:on as an optically controlled CPN phase shifter.

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Thermal induced transition in the bonding nature of C60 molecules adsorbed on a Si(111)–(7×7) surface

Cited by 6 publications

References 15 publications

Nanojunction between Fullerene and One-Dimensional Conductive Polymer on Solid Surfaces

Nanojunction between Fullerene and One-Dimensional Conductive Polymer on Solid Surfaces

Heterodimerization via the Covalent Bonding of Ta@Si₁₆ Nanoclusters and C₆₀ Molecules

Scanning Tunneling Microscopy/Spectroscopy of La₂@C₇₂ Multilayer Islands on Si(100)-2×1-H Surfaces

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Thermal induced transition in the bonding nature of C60 molecules adsorbed on a Si(111)–(7×7) surface

Cited by 6 publications

References 15 publications

Nanojunction between Fullerene and One-Dimensional Conductive Polymer on Solid Surfaces

Nanojunction between Fullerene and One-Dimensional Conductive Polymer on Solid Surfaces

Heterodimerization via the Covalent Bonding of Ta@Si16 Nanoclusters and C60 Molecules

Scanning Tunneling Microscopy/Spectroscopy of La2@C72 Multilayer Islands on Si(100)-2×1-H Surfaces

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Heterodimerization via the Covalent Bonding of Ta@Si₁₆ Nanoclusters and C₆₀ Molecules

Scanning Tunneling Microscopy/Spectroscopy of La₂@C₇₂ Multilayer Islands on Si(100)-2×1-H Surfaces