Monolayers and Multilayers of Unsubstituted Copper Phthalocyanine

Ogawa, Kimiya; Yonehara, Hidenori; Pac, Chyongjin

doi:10.1021/la00019a008

Cited by 29 publications

(14 citation statements)

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“…Graphene was obtained by mechanical exfoliation on a 300 nm SiO 2 /Si substrate. An upstanding copper phthalocyanine (CuPc) layer was constructed on top of graphene using the Langmuir–Blodgett (LB) technique 26. A surface pressure ( π ) versus occupied molecular area ( A ) isotherm was obtained at a constant compression speed of 2 mm min −1 after allowing 30 min for complete evaporation of the solvent.…”

Section: Resultsmentioning

confidence: 99%

Probing the Effect of Molecular Orientation on the Intensity of Chemical Enhancement Using Graphene‐Enhanced Raman Spectroscopy

Ling

et al. 2012

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A rational approach to investigate the effect of molecular orientation on the intensity of chemical enhancement using graphene-enhanced Raman spectroscopy (GERS) is developed. A planar molecule, copper phthalocyanine (CuPc), is used as probe molecule. Annealing allows the CuPc molecule in a Langmuir-Blodgett film to change orientation from upstanding to lying down. The UV-visible absorption spectra prove the change of the molecular orientation, as well as the variation of the interaction between the CuPc molecule and graphene. The Raman spectra of the molecule in the two different orientations are compared and analyzed. The results show that chemical enhancement is highly sensitive to the molecular orientation. The different molecular orientations induce different magnitudes of the interaction between the molecule and graphene. The stronger the interaction, the more the Raman signal is enhanced. Furthermore, the sensitivity of GERS to molecular orientation is promising to determine the orientation of the molecule on graphene. Based on this molecular orientation sensitive Raman enhancement, quantitative calculation of the magnitude of the chemical enhancement is implemented for a series of Pc derivatives. It shows that the magnitude of the chemical enhancement can be used to evaluate the degree of interaction between the molecules and graphene. Moreover, an understanding of the chemical enhancement in GERS is promoted and the effect of molecular orientation on the intensity of chemical enhancement is explained.

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Section: Resultsmentioning

confidence: 99%

Probing the Effect of Molecular Orientation on the Intensity of Chemical Enhancement Using Graphene‐Enhanced Raman Spectroscopy

Ling

et al. 2012

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“…The L‐B technique offers a promising and reliable method to prepare large‐area ordered SAMs. For example, we and others have demonstrated the successful applications of the L‐B technique to CuPc and conjugated polymers in producing ultrathin film OFETs 62–64. However, the charge carrier mobilities in these devices were low, namely about 10 −7 ∼10 −3 cm 2 V −1 s −1 .…”

Section: Sams Acting As Active Layers Carbon Nanomaterials Actingmentioning

confidence: 99%

“…However, typical amphiphilic molecules, usually a carboxylic acid with an alkyl group in the opposite site, will lead to carrier trapping by carboxylate 61. Copper phthalocyanine (CuPc) is not a typical amphiphilic molecule, but it has been demonstrated that CuPc dissolved in a mixture of trifluoroacetic acid and dichloromethane could form a stable monolayer at the air‐water interface and could be deposited on substrates with Pc macrocycles oriented nearly perpendicular to the substrates 62–64. Recently, our group took advantage of this method to achieve high‐performance CuPc monolayer transistors with high photoresponsivity, using either 1D SWNT or 2D graphene as electrodes 22, 27.…”

Section: Formation Of Samsmentioning

confidence: 99%

Unique Role of Self‐Assembled Monolayers in Carbon Nanomaterial‐Based Field‐Effect Transistors

Chen

Guo

2013

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Molecular self-assembly is a promising technology for creating reliable functional films in optoelectronic devices with full control of thickness and even spatial resolution. In particular, rationally designed self-assembled monolayers (SAMs) play an important role in modifying the electrode/semiconductor and semiconductor/dielectric interfaces in field-effect transistors. Carbon nanomaterials, especially single-walled carbon nanotubes and graphene, have attracted intense interest in recent years due to their remarkable physicochemical properties. The combination of the advantages of both SAMs and carbon nanomaterials has been opening up a thriving research field. In this Review article, the unique role of SAMs acting as either active or auxiliary layers in carbon nanomaterials-based field-effect transistors is highlighted for tuning the substrate effect, controlling the carrier type and density in the conducting channel, and even installing new functionalities. The combination of molecular self-assembly and molecular engineering with materials fabrication could incorporate diverse molecular functionalities into electrical nanocircuits, thus speeding the development of nanometer/molecular electronics in the future.

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“…Then, CuPc LB monolayers were fabricated as reported. 23,24 Figure 2 showed the scanning electron microscopy ͑SEM͒ and atomic force microscopy ͑AFM͒ images of the CuPc MTFTs with a 1 m channel length. CuPc formed a dense and smooth monolayer in the channel between two electrodes ͓Fig.…”

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confidence: 99%

Langmuir–Blogett monolayer transistors of copper phthalocyanine

Wei

Cao

et al. 2009

Applied Physics Letters

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GO and RGO based FETs fabricated with Langmuir-Blodgett grown monolayers AIP Conf.Effects of the permanent dipoles of self-assembled monolayer-treated insulator surfaces on the field-effect mobility of a pentacene thin-film transistor Appl. Phys. Lett. 90, 132104 (2007); 10.1063/1.2457776 Improved morphology and charge carrier injection in pentacene field-effect transistors with thiol-treated electrodes

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Monolayers and Multilayers of Unsubstituted Copper Phthalocyanine

Cited by 29 publications

References 0 publications

Probing the Effect of Molecular Orientation on the Intensity of Chemical Enhancement Using Graphene‐Enhanced Raman Spectroscopy

Probing the Effect of Molecular Orientation on the Intensity of Chemical Enhancement Using Graphene‐Enhanced Raman Spectroscopy

Unique Role of Self‐Assembled Monolayers in Carbon Nanomaterial‐Based Field‐Effect Transistors

Langmuir–Blogett monolayer transistors of copper phthalocyanine

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