Evidence for metal-C60 interface interaction from Raman spectroscopy

Mănăilă, R.; Belu-Marian, A.; Macovei, D.; Brehm, G.; Marian, D. Th.; Baltog, I.

doi:10.1002/(sici)1097-4555(199911)30:11<1019::aid-jrs437>3.0.co;2-w

Cited by 23 publications

(8 citation statements)

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“…Due to the high electron affinity of C 60 molecules as well as the metallic nature of the surfaces, charge transfer has been observed in a number of systems such as C 60 adsorbed on metal Cu, Ag, and Au ͑while some controversy exists about C 60 on an Al surface͒. [1][2][3][4][5][6] Modification in the electronic structure of the molecules is found to be responsible for the enhancement in Raman spectroscopy [7][8][9][10][11] and changes in resistance. 3,[12][13][14] Lately, angle-resolved photoemission spectroscopy ͑ARPES͒ has been reported to study band dispersion in an electrondoped ͑via alkali-metal͒ C 60 monolayer ͑ML͒ on Ag surfaces.…”

Section: Introductionmentioning

confidence: 99%

“…3,8,10,18,19 Experiments 3 indicate that when a C 60 ML is placed on top of a thin film, the resistance of a given sample is measured about 8000 ⍀, which leads to a resistivity corresponding to half the three-dimensional alkali-metal-doped compounds A 3 C 60 (AϭK, Rb͒. When the C 60 is beneath the Cu film, the ML also enhances the conductance.…”

Section: Introductionmentioning

confidence: 99%

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Rotation, translation, charge transfer, and electronic structure ofC60on Cu(111) surface

Wang

Cheng

2004

Phys. Rev. B

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The energetics and electronic structure of a C 60 monolayer on Cu͑111͒ surfaces have been investigated thoroughly via large-scale first-principles density functional theory. The calculated adsorption site and orientation of the molecule, and the work function are in excellent agreement with experimental observations. We find that the translational motion of C 60 across Cu-Cu bonds can be barrierless, while a 360°, on-site rotational motion is subject to a barrier of 0.3 eV. A close to 0.8e Ϫ charge transfer per molecule from the surface to the C 60 monolayer is determined, which provides important insights into a number of experimental measurements. Our analysis also indicates that the transferred electrons are localized in a plane between the molecule and surface, and that the bands near the Fermi level are highly hybrid between the surface and the molecule, reflecting a strong metal-fullerene coupling. Furthermore, an analysis of the dipole moment clarifies the puzzling phenomenon regarding the work function.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rotation, translation, charge transfer, and electronic structure ofC60on Cu(111) surface

Wang

Cheng

2004

Phys. Rev. B

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“…Further, the possibility of electron transfer from the metal substrate to C 60 is interesting in the field of surface science. Actually, Manaila et al 17 have shown a charge transfer for C 60 /Cu based on Raman spectroscopy. The charge transfer has also been demonstrated more directly for a monolayer of C 60 on several single crystalline metal substrates by using IR reflection absorption (IRRAS), 18–20 sum‐frequency generation (SFGS), 18,19 and high‐resolution electron energy loss (HREELS) 21,22 spectroscopies.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Infrared Absorption of C₆₀ on Thin Evaporated Pd Island Films

Wadayama

Ohta

Hatta

2006

Israel Journal of Chemistry

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Infrared transmission spectra of C60 multilayers on thin Pd films deposited onto surface‐oxidized Si(100) and hydrogen‐terminated Si(111) substrates are reported. In both cases, the spectra in the 1500–1100 cm−1 region exhibited bands at 1444, 1429, and 1182 cm−1 due, respectively, to the Ag (2), T1u (4), and T1u (3) modes. The appearance of the Ag (2) mode, which is originally infrared inactive (Raman active), reveals electron transfer from the metal to chemisorbed C60. Indeed, increasing the thickness of C60, the Ag (2) mode intensity saturated more rapidly than the T1u (4) and T1u (3) modes. The originally infrared active T1u (4) and T1u (3) modes were enhanced in intensity depending upon the Pd thickness. Actually, while both substrates gave nearly the same magnitude of enhancement, the optimum Pd thickness was smaller on the hydrogen‐terminated surface than on the surface‐oxidized surface. On the other hand, the Ag (2) mode was less intense on the hydrogen‐terminated surface than on the oxidized surface, suggestive of a shortage of chemisorbed C60 and thus pointing out the importance of the metal film morphology. Indeed, Pd films deposited on the two substrates gave rise to quite different AFM images. We also show that, regardless of the substrate, the Ag (2) mode is an order of magnitude smaller than for Ag deposition, though no remarkable intensity differences were observed with respect to the T1u (4) and T1u (3) modes.

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“…16 Further, the possibility of electron transfer from the metal substrate to C 60 is interesting in the field of surface science. Actually, Manaila et al 17 have shown a charge transfer for C 60 /Cu based on Raman spectroscopy. The charge transfer has also been demonstrated more directly for a monolayer of C 60 on several single crystalline metal substrates by using IR reflection absorption (IRRAS), [18][19][20] sum-frequency generation (SFGS), 18,19 and high-resolution electron energy loss (HREELS) 21,22 spectroscopies.…”

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confidence: 99%

Enhanced Infrared Absorption of C 60 on Thin Evaporated Pd Island Films

Wadayama¹,

Ohta²,

Hatta³

2006

Israel Journal of Chemistry

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Infrared transmission spectra of C 60 multilayers on thin Pd films deposited onto surface-oxidized Si(100) and hydrogen-terminated Si(111) substrates are reported. In both cases, the spectra in the 1500-1100 cm -1 region exhibited bands at 1444, 1429, and 1182 cm -1 due, respectively, to the A g (2), T 1u (4), and T 1u (3) modes. The appearance of the A g (2) mode, which is originally infrared inactive (Raman active), reveals electron transfer from the metal to chemisorbed C 60 . Indeed, increasing the thickness of C 60 , the A g (2) mode intensity saturated more rapidly than the T 1u (4) and T 1u (3) modes. The originally infrared active T 1u (4) and T 1u (3) modes were enhanced in intensity depending upon the Pd thickness. Actually, while both substrates gave nearly the same magnitude of enhancement, the optimum Pd thickness was smaller on the hydrogen-terminated surface than on the surface-oxidized surface. On the other hand, the A g (2) mode was less intense on the hydrogen-terminated surface than on the oxidized surface, suggestive of a shortage of chemisorbed C 60 and thus pointing out the importance of the metal film morphology. Indeed, Pd films deposited on the two substrates gave rise to quite different AFM images. We also show that, regardless of the substrate, the A g (2) mode is an order of magnitude smaller than for Ag deposition, though no remarkable intensity differences were observed with respect to the T 1u (4) and T 1u (3) modes.

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Evidence for metal-C60 interface interaction from Raman spectroscopy

Cited by 23 publications

References 23 publications

Rotation, translation, charge transfer, and electronic structure ofC60on Cu(111) surface

Rotation, translation, charge transfer, and electronic structure ofC60on Cu(111) surface

Enhanced Infrared Absorption of C₆₀ on Thin Evaporated Pd Island Films

Enhanced Infrared Absorption of C 60 on Thin Evaporated Pd Island Films

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Evidence for metal-C60 interface interaction from Raman spectroscopy

Cited by 23 publications

References 23 publications

Rotation, translation, charge transfer, and electronic structure ofC60on Cu(111) surface

Rotation, translation, charge transfer, and electronic structure ofC60on Cu(111) surface

Enhanced Infrared Absorption of C60 on Thin Evaporated Pd Island Films

Enhanced Infrared Absorption of C 60 on Thin Evaporated Pd Island Films

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Enhanced Infrared Absorption of C₆₀ on Thin Evaporated Pd Island Films