Chemical Bonding of Fullerene and Fluorinated Fullerene on Bare and Hydrogenated Diamond

Ouyang, Ti; Qi, Dongchen; Wee, Andrew Thye Shen; Nesládek, Miloš

doi:10.1002/cphc.200800054

Cited by 17 publications

(12 citation statements)

References 52 publications

(66 reference statements)

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“…Complete desorption is achieved by annealing the substrate to a temperature in the range of 573 to 653 K. This finding corresponds well with previous high-resolution electron energy loss spectroscopy (HREELS) results, reporting multilayer desorption at temperatures of 473 K, while complete desorption has been achieved at 573 K. 9 A rough estimate can be obtained for the desorption enthalpy using Redhead's formula for the desorption enthalpy…”

Section: Complete Desorptionsupporting

confidence: 89%

“…Interestingly, the desorption enthalpy is slightly larger than the sublimation enthalpy of crystalline C 60 , around 1.65 eV, 18 which explains why multilayer desorption occurs at temperatures below 035420-3 complete desorption. 9 In other words, the binding energy of C 60 to the hydrogenated diamond surface is larger than the binding of C 60 molecules among each other in a solid crystal. This finding is in agreement with the fact that an extended wetting layer is found after moderate annealing.…”

Section: Complete Desorptionmentioning

confidence: 99%

“…Inspired by this finding, efforts have been made to study the adsorption of fullerenes on hydrogenated diamond surfaces in more detail. 8,9 However, no study exists so far addressing the consequences of charge transfer doping on the C 60 island morphologies on hydrogenated diamond.…”

Section: Introductionmentioning

confidence: 99%

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Influence of charge transfer doping on the morphologies of C60islands on hydrogenated diamond C(100)-(2×1)

et al. 2012

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The adsorption and island formation of C 60 fullerenes on the hydrogenated C(100)-(2 × 1):H diamond surface is studied using high-resolution noncontact atomic force microscopy in ultrahigh vacuum. At room temperature, C 60 fullerene molecules assemble into monolayer islands, exhibiting a hexagonally close-packed internal structure. Dewetting is observed when raising the substrate temperature above approximately 505 K, resulting in two-layer high islands. In contrast to the monolayer islands, these double-layer islands form extended wetting layers. This peculiar behavior is explained by an increased molecule-substrate binding energy in the case of double-layer islands, which originates from charge transfer doping. Only upon further increasing the substrate temperature to approximately 615 K, the wetting layer desorbs, corresponding to a binding energy of the charge transfer-stabilized film of 1.7 eV.

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Section: Complete Desorptionsupporting

confidence: 89%

Section: Complete Desorptionmentioning

confidence: 99%

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Influence of charge transfer doping on the morphologies of C60islands on hydrogenated diamond C(100)-(2×1)

et al. 2012

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“…Post-Funktionalisierung ist z. B. von der Modifizierung von Kohlenstoffnanorçhren [144,145] und Fullerenen [146] bekannt und machte diese überhaupt erst anwendbar. [58] Graphitisches Kohlenstoffnitrid…”

Section: Post-funktionalisierungunclassified

Polymeres graphitisches Kohlenstoffnitrid als heterogener Organokatalysator: von der Photochemie über die Vielzweckkatalyse hin zur nachhaltigen Chemie

2011

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Polymere graphitische Kohlenstoffnitrid‐Materialien (vereinfacht g‐C3N4), die nur aus C, N und Spuren von H bestehen, sind in den letzten Jahren wieder verstärkt in das Zentrum des Interesses gerückt, wohl auch wegen der Ähnlichkeit zu Graphit. g‐C3N4 ist anders als Graphit ein Halbleiter mit mittlerer Bandlücke und damit ein effektiver (Photo)‐Katalysator für eine ganze Reihe von Reaktionen. In diesem Aufsatz beschreiben wir die “Polymerchemie” des synthetischen Aufbaus, wie die Bandlagen und die Bandlücke durch Copolymerisation und Dotierung verändert werden können und wie Änderungen der Festkörpertextur die Effektivität dieses heterogenen Organokatalysators verbessern können. g‐C3N4 und seine Modifikationen zeigen eine sehr hohe thermische und chemische Stabilität und katalysieren eine ganze Reihe von “Traumreaktionen”, wie die photochemische Spaltung von Wasser, milde und selektive Oxidationsreaktionen, oder – als coaktiver Katalysatorträger – superschnelle Hydrierungen. Da Kohlenstoffnitrid metallfrei ist, toleriert es funktionelle Gruppen und ist daher für Vielzweckanwendungen in der Umwandlung von Biomasse und in der nachhaltigen Chemie geeignet.

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“…Another example of an organic-inorganic system, which is extensively studied, is diamond in combination with organics, e.g., fullerene [10,11]. Such systems are highly promising for bio-sensoric or opto-electronic applications, as a charge transport between the two materials is observed.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, structure, and opto-electronic properties of organic-based nanoscale heterojunctions

et al. 2011

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Enormous research effort has been put into optimizing organic-based opto-electronic systems for efficient generation of free charge carriers. This optimization is mainly due to typically high dissociation energy (0.1-1 eV) and short diffusion length (10 nm) of excitons in organic materials. Inherently, interplay of microscopic structural, chemical, and opto-electronic properties plays crucial role. We show that employing and combining advanced scanning probe techniques can provide us significant insight into the correlation of these properties. By adjusting parameters of contact- and tapping-mode atomic force microscopy (AFM), we perform morphologic and mechanical characterizations (nanoshaving) of organic layers, measure their electrical conductivity by current-sensing AFM, and deduce work functions and surface photovoltage (SPV) effects by Kelvin force microscopy using high spatial resolution. These data are further correlated with local material composition detected using micro-Raman spectroscopy and with other electronic transport data. We demonstrate benefits of this multi-dimensional characterizations on (i) bulk heterojunction of fully organic composite films, indicating differences in blend quality and component segregation leading to local shunts of photovoltaic cell, and (ii) thin-film heterojunction of polypyrrole (PPy) electropolymerized on hydrogen-terminated diamond, indicating covalent bonding and transfer of charge carriers from PPy to diamond.

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Chemical Bonding of Fullerene and Fluorinated Fullerene on Bare and Hydrogenated Diamond

Cited by 17 publications

References 52 publications

Influence of charge transfer doping on the morphologies of C60islands on hydrogenated diamond C(100)-(2×1)

Influence of charge transfer doping on the morphologies of C60islands on hydrogenated diamond C(100)-(2×1)

Polymeres graphitisches Kohlenstoffnitrid als heterogener Organokatalysator: von der Photochemie über die Vielzweckkatalyse hin zur nachhaltigen Chemie

Synthesis, structure, and opto-electronic properties of organic-based nanoscale heterojunctions

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