Novel nanographene/porphyrin hybrids – preparation, characterization, and application in solar energy conversion schemes

Kiessling, Daniel; Costa, Rubén D.; Katsukis, Georgios; Malig, Jenny; Lodermeyer, Fabian; Feihl, Sebastian; Roth, Alexandra; Wibmer, Leonie; Kehrer, Matthias; Volland, Michel; Wagner, Paweł; Wallace, Gordon G.; Officer, David L.; Guldi, Dirk M.

doi:10.1039/c3sc51026c

Cited by 60 publications

(55 citation statements)

References 49 publications

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“…53 In particular, 1-2 mg of natural graphite were added to a 10 −5 M DMF solution of pyridyl-phthalocyanines, which were ultrasonicated for 45 min and subsequently centrifuged at 20g for 20 min. The supernatants were then extracted and again subjected to ultrasonication with newly added natural graphite.…”

Section: Resultsmentioning

confidence: 99%

Decorating graphene nanosheets with electron accepting pyridyl-phthalocyanines

et al. 2015

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We describe herein the preparation of novel exfoliated graphene-phthalocyanine nanohybrids, and the investigation of their photophysical properties. Pyridyl-phthalocyanines (Pcs) 1-3 are presented as novel electron accepting building blocks of variable strengths with great potential for the exfoliation of graphite via their immobilization onto the basal plane of graphene in dimethylformamide (DMF) affording single layered and turbostratic graphene based G1-G3. G1-G3 were fully characterized (AFM, TEM, Raman, steady-state and pump probe transient absorption spectroscopy) and were studied in terms of electron donor-acceptor interactions in the ground and excited states. In this context, electron transfer upon photoexcitation from graphene to the electron accepting Pcs with dynamics, for example, in G2 of <1 and 330 ± 50 ps for charge separation and charge recombination, respectively, was corroborated in a series of steady-state and time-resolved spectroscopy experiments.

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Section: Resultsmentioning

confidence: 99%

Decorating graphene nanosheets with electron accepting pyridyl-phthalocyanines

et al. 2015

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“…Here, the shape of the 2D band supports the production of electronically decoupled single layer graphene [68] , while the TEM analysis showed a mixture of monolayer and few layers.…”

Section: Solvent Exfoliation Of Graphitementioning

confidence: 99%

High‐Performance Multifunctional Graphene‐PLGA Fibers: Toward Biomimetic and Conducting 3D Scaffolds

Esrafilzadeh

Jalili

Stewart

et al. 2016

Adv Funct Materials

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The development of electrically conducting fibers based on known cytocompatible materials is of interest to those engaged in tissue regeneration using electrical stimulation. Herein, it is demonstrated that with the aid of rheological insights, optimized formulations of graphene containing spinnable poly(lactic-co-glycolic acid) (PLGA) dopes can be made possible. This helps extend the general understanding of the mechanics involved in order to deliberately translate the intrinsic superior electrical and mechanical properties of solutionprocessed graphene into the design process and practical fiber architectural engineering. The as-produced fibers are found to exhibit excellent electrical conductivity and electrochemical performance, good mechanical properties, and cellular affinity. At the highest loading of graphene (24.3 wt%), the conductivity of as-prepared fibers is as high as 150 S m-1 (more than two orders of magnitude higher than the highest conductivity achieved for any type of nanocarbon-PLGA composite fibers) reported previously. Moreover, the Young's modulus and tensile strength of the base fiber are enhanced 647-and 59-folds, respectively, through addition of graphene. Disciplines Engineering | Physical Sciences and Mathematics Publication DetailsEsrafilzadeh, D., Jalili, R., Stewart, E. M., Aboutalebi, S. H., Razal, J. M., Moulton, S. The development of electrically conducting fibers based on known cytocompatible materials is of interest to those engaged in tissue regeneration using electrical stimulation. Herein, we demonstrate that with the aid of rheological insights, optimized formulations of graphene 2 containing spinnable Poly Lactic-co-Glycolic Acid (PLGA) dopes can be made possible. This helps us extend our general understanding of the mechanics involved in order to deliberately translate the intrinsic superior electrical and mechanical properties of solution-processed graphene into the design process and practical fiber architectural engineering. The asproduced fibers were found to exhibit excellent electrical conductivity, and electrochemical performance, good mechanical properties, and cellular affinity. At the highest loading of graphene (24.3 wt. %), the conductivity of as-prepared fibers was as high as 150 S m −1 (more than 2 orders of magnitude higher than the highest conductivity achieved for any type of nanocarbon-PLGA composite fibers) reported previously. Moreover, the Young's modulus and tensile strength of the base fiber were enhanced 647-and 59-folds, respectively, through addition of graphene.

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“…The images prompt to akes with mean side lengths of up to 200 nm. They also show that the akes were unruffled and the edges were mainly observed to be multiples of 30 . Edge angles like 60 and 120 indicate same chiralities between two adjacent edges, whereas 30, 90, and 150 are observable when different chiralities converge.…”

mentioning

confidence: 97%

“…In recent work, we successfully demonstrated the exfoliation of graphite in solution by taking advantage of non-covalent interactions with porphycenes, 27 phthalocyanines, 28 porphyrins, 29,30 etc., and realized single layer/bilayer nano-graphene charge transfer nanohybrids. Spectroscopic as well as kinetic evidences were established not only for ground-state interactions, but also for interactions in the excited state.…”

Section: Introductionmentioning

confidence: 99%

Electron-accepting phthalocyanine–pyrene conjugates: towards liquid phase exfoliation of graphite and photoactive nanohybrid formation with graphene

et al. 2014

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Herein, we describe the synthesis of a zinc(II) alkylsulfonylphthalocyanine-pyrene conjugate, its assembly with highly exfoliated graphite, and the investigation of the photophysical properties of the resulting nanohybrid. The presence of the pyrene unit in the conjugate is decisive in terms of non-covalently immobilizing the electron accepting phthalocyanines onto the basal plane of highly exfoliated graphite.As a matter of fact, strong interactions dominate the electronic properties of the nanohybrid in both the ground and excited states. For example, femtosecond pump probe experiments assist in corroborating an ultrafast charge separation, that is, the generation of the one-electron reduced radical anion of the phthalocyanine and one-electron oxidized graphene after irradiation at 387 nm, followed by slow charge recombination.

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Novel nanographene/porphyrin hybrids – preparation, characterization, and application in solar energy conversion schemes

Cited by 60 publications

References 49 publications

Decorating graphene nanosheets with electron accepting pyridyl-phthalocyanines

Decorating graphene nanosheets with electron accepting pyridyl-phthalocyanines

High‐Performance Multifunctional Graphene‐PLGA Fibers: Toward Biomimetic and Conducting 3D Scaffolds

Electron-accepting phthalocyanine–pyrene conjugates: towards liquid phase exfoliation of graphite and photoactive nanohybrid formation with graphene

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