Scanning tunneling microscopy imaging of conducting Langmuir-Blodgett films

Mulè, Marcello; Stüssi, E.; Rossi, Danilo De; Berzina, Tatiana; Troitsky, V.I.

doi:10.1016/0040-6090(94)90265-8

Cited by 10 publications

(6 citation statements)

References 23 publications

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“…Figure shows an image of an LB film of C 16 H 33 −BEDT−TTF molecules acquired at 20% relative humidity. Its features are in good agreement with previous STM images reported by other authors, and it gives the following unit cell parameter values, after calibration corrections: 25 r 1 = 3.23 Å, r 2 = 2.46 Å, and γ = 97.1° shows the images of two acquisitions in different conditions of humidity.…”

Section: Experimental Results Of Stm Imagingsupporting

confidence: 90%

“…To obtain reliable values of the average corrugation, the work must be performed on well-organized layers, such as LB films. Therefore, we have used LB films of conductive molecules already resolved with STM microscopy . Figure shows an image of an LB film of C 16 H 33 −BEDT−TTF molecules acquired at 20% relative humidity.…”

Section: Experimental Results Of Stm Imagingmentioning

confidence: 99%

“…The organic molecules inside our films have 16 carbon atoms in the chain. The polar height range from 3.2 Å to more than 7 Å depending on the orientation . Therefore, the total length of a C 16 H 33 −BEDT−TTF molecule is from 23.2 Å to 27 Å, if the tail is normal to the graphite plane.…”

Section: Discussionmentioning

confidence: 99%

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STM Image Formation of Organic Thin Films: The Role of Water Shell

2000

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Analysis of the water role in STM image formation processes for organic thin films was performed in this work. The contribution of the water shell covering the film was considered under the assumption that no water can be inside the film molecules. Conducting thin films were chosen as objects and they were measured under different humidity conditions. The images were processed for calculating their average corrugation. The relationship of the corrugation with the relative humidity was outlined and compared with a theoretical model of water adsorption. Finally, nanogravimetric and contact angle measurements were performed as independent proofs of the water adsorption model.

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Section: Experimental Results Of Stm Imagingsupporting

confidence: 90%

Section: Experimental Results Of Stm Imagingmentioning

confidence: 99%

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STM Image Formation of Organic Thin Films: The Role of Water Shell

2000

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“…A different strategy to achieve electrical conductivity involves the use of Langmuir-Blodgett films. 21,[60][61][62][63][64][65] Conducting Langmuir-Blodgett films with high quality morphology and with reproducible and stable properties are interesting in view of the development of molecular electronics. It was shown that the use of surfactant TCNQ derivatives with long-chain alkylic substituents could be successfully used for the preparation of conducting films when used in combination with tetrathiafulvalene derivatives.…”

Section: Electrical Conductivitymentioning

confidence: 99%

The first two decades of a versatile electron acceptor building block: 11,11,12,12-tetracyano-9,10-anthraquinodimethane (TCAQ)

2007

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This critical review surveys the development of the structural and electrochemical knowledge of the TCAQ moiety since its discovery, nearly two decades ago, until the present. Additionally, recent advances in the chemistry and functionalization of this versatile building block are highlighted, with special emphasis on the strategies devoted to the preparation of donor-acceptor molecular and polymeric materials. The applications of TCAQ-based materials in materials science as electrical conductors, molecular rectifiers, in photoinduced electron transfer processes, optoelectronic devices and as electrochiroptical materials are also reviewed (89 references).

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“…1) and its properties explored. The structural organization of LB films was studied by electron diffraction and electron microscopy and probable molecular packing was proposed [11]; the close packing of these molecules in the films was also observed by scanning tunnelling microscopy [12] and the influence of structural changes on the conductivity was explained [13]. The role of the dopant (surfactant acceptor) was studied [14] and the possibility of building up new architectures with organic compounds was investigated [15].…”

Section: Introductionmentioning

confidence: 99%

On the degradation of conducting Langmuir-Blodgett films

Carrara

Gussoni

Erokhin

et al. 1995

J Mater Sci: Mater Electron

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Direct current through conducting Langmuir-Blodgett films was observed as a function of the applied voltage and alternating current as a function of frequency. In some cases voltage-current characteristics appeared to be quasi-ohmic but in other cases they exhibited tunnelling-like behaviour. This phenomenon was interpreted as being due to the progressive detachment of the film from the micro-electrodes, as confirmed by measurements of the conductivity as a function of time. This interpretation was also confirmed by estimating the tunnelling barrier parameters from voltage-current characteristics, by conductivity measurements before and after thermal treatment of the samples and by conductivity measurements of samples stored in air and under vacuum.

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Scanning tunneling microscopy imaging of conducting Langmuir-Blodgett films

Cited by 10 publications

References 23 publications

STM Image Formation of Organic Thin Films: The Role of Water Shell

STM Image Formation of Organic Thin Films: The Role of Water Shell

The first two decades of a versatile electron acceptor building block: 11,11,12,12-tetracyano-9,10-anthraquinodimethane (TCAQ)

On the degradation of conducting Langmuir-Blodgett films

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