AC and DC conduction in fatty acid Langmuir films

Roberts, G.G.; Vincett, P. S.; Barlow, William

doi:10.1088/0022-3719/11/10/018

Cited by 59 publications

(17 citation statements)

References 24 publications

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“…The first successful experiment with ∼80% yield of reproducible devices was published by Mann & Kuhn in 1971, who measured LB monolayers of Cd-salts of fatty acids on oxidized Al substrate and various top contacts. 101 They extracted a dielectric constant of alkyl-based films between 2.7 to 2.4, which was later confirmed by many follow-up studies on LB films, [102][103][104] as well as by recent results for thiol-based self-assembled monolayers. [105][106][107] The tunneling decay coefficient (β, see Eqs.…”

Section: Who: Major Milestones In Measuring Charge Transport Across Mmentioning

confidence: 53%

“…Roberts et al, were the first to use a semiconductor substrate (InP) rather than a metallic one, in an attempt to avoid the inevitable oxide dielectric that complicates the data analysis. 102 They also studied the frequency response of both conductance and capacitance, and attributed it to either hopping of electronic carriers, or to polarization of the carboxylic acid dipole. 102 The next step was to introduce functionality into the monolayer by using redox-active groups ("electrochemistry-like" MolEl) or layers of donor-acceptor pairs and dye molecules sandwiched between solid metallic contacts ("organic electronics-like" MolEl).…”

Section: Who: Major Milestones In Measuring Charge Transport Across M...mentioning

confidence: 99%

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Large-Area, Ensemble Molecular Electronics: Motivation and Challenges

2017

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We review charge transport across molecular monolayers, which is central to molecular electronics (MolEl), using large-area junctions (NmJ). We strive to provide a wide conceptual overview of three main subtopics. First, a broad introduction places NmJ in perspective to related fields of research and to single-molecule junctions (1mJ) in addition to a brief historical account. As charge transport presents an ultrasensitive probe for the electronic perfection of interfaces, in the second part ways to form both the monolayer and the contacts are described to construct reliable, defect-free interfaces. The last part is dedicated to understanding and analyses of current-voltage (I-V) traces across molecular junctions. Notwithstanding the original motivation of MolEl, I-V traces are often not very sensitive to molecular details and then provide a poor probe for chemical information. Instead, we focus on how to analyze the net electrical performance of molecular junctions, from a functional device perspective. Finally, we point to creation of a built-in electric field as a key to achieve functionality, including nonlinear current-voltage characteristics that originate in the molecules or their contacts to the electrodes. This review is complemented by a another review that covers metal-molecule-semiconductor junctions and their unique hybrid effects.

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Section: Who: Major Milestones In Measuring Charge Transport Across Mmentioning

confidence: 53%

Section: Who: Major Milestones In Measuring Charge Transport Across M...mentioning

confidence: 99%

Large-Area, Ensemble Molecular Electronics: Motivation and Challenges

2017

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“…Electrical conductivity of films: In non-polar films when is applied high frequency these can change to the film in conductive of alternate current (AC) [18]. In this study we will test the electrical properties in bulk of films with added different nonionic surfactants to correlate the interaction with water.…”

Section: Methodsmentioning

confidence: 99%

Fogging Control on LDPE/EVA Coextruded Films: Wettability Behavior and Its Correlation with Electric Performance

Waldo-Mendoza¹,

Quiñones-Jurado²,

Pérez-Medina³

et al. 2017

Membranes

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The transformation of fog at a non-visible water layer on a membrane of low-density polyethylene (LDPE) and ethylene-vinyl acetate (EVA) was evaluated. Nonionic surfactants of major demand in the polyolefin industry were studied. A kinetic study using a hot fog chamber showed that condensation is controlled by both the diffusion and permanency of the surfactant more than by the change of the surface energy developed by the wetting agents. The greatest permanency of the anti-fog effect of the LDPE/EVA surface was close to 3000 h. The contact angle results demonstrated the ability of the wetting agent to spread out to the surface. Complementarily, the migration of nonionic surfactants from the inside of the polymeric matrix to the surface was analyzed by Fourier transform infrared (FTIR) microscopy. Additionally, electrical measurement on the anti-fogging membrane at alternating currents and at a sweep frequency was proposed to test the conductivity and wetting ability of nonionic surfactants. We proved that the amphiphilic molecules had the ability to increase the conductivity in the polyolefin membrane. A correlation between the bulk electrical conductivity and the permanency of the fogging control on the LDPE/EVA coextruded film was found.

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“…It is much more difficult to then deposit a second metal electrode atop the organic layer without damaging the organic layer. The electrical properties of LB multilayers have been studied for decades 43–46. The method of making “metal | LB layers | metal” sandwiches was improved dramatically by J. Roy Sambles and co‐workers at Exeter University, who found that Mg vapor and thin Mg films would damage the LB films least, and studied molecular rectification 15,47.…”

Section: Electrical Properties Of Monolayers and Multilayersmentioning

confidence: 99%

PACAP mRNA is expressed in rat spinal cord neurons

Pettersson

Heine

Verge

et al. 2004

J of Comparative Neurology

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This study examines the expression of pituitary adenylate cyclase activating polypeptide (PACAP) mRNA in the rat spinal cord during normal conditions and in response to sciatic nerve transection. Previously, PACAP immunoreactivity has been found in fibers in the spinal cord dorsal horn and around the central canal and in neurons in the intermediolateral column (IML). Furthermore, in the dorsal root ganglia, PACAP immunoreactivity and PACAP mRNA expression have been observed preferentially in nerve cell bodies of smaller diameter terminating in the superficial laminae of the dorsal horn. However, neuronal expression of PACAP mRNA in adult rat spinal cord appeared limited to neurons of the IML. By using a refined in situ hybridization protocol, we now detect PACAP mRNA expression in neurons primarily in laminae I and II, but also in deeper laminae of the spinal cord dorsal horn and around the central canal. In addition, PACAP mRNA expression is observed in a few neurons in the ventral horn. PACAP expression in the ventral horn is increased in a population of large neurons, most likely motor neurons, both after distal and proximal sciatic nerve transection. The proposed role of PACAP in nociception is strengthened by our findings of PACAP mRNA-expressing neurons in the superficial laminae of the dorsal horn. Furthermore, increased expression of PACAP in ventral horn neurons, in response to nerve transection, suggests a role for PACAP in repair/regeneration of motor neurons.

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AC and DC conduction in fatty acid Langmuir films

Cited by 59 publications

References 24 publications

Large-Area, Ensemble Molecular Electronics: Motivation and Challenges

Large-Area, Ensemble Molecular Electronics: Motivation and Challenges

Fogging Control on LDPE/EVA Coextruded Films: Wettability Behavior and Its Correlation with Electric Performance

PACAP mRNA is expressed in rat spinal cord neurons

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