Localization and delocalization of charges injected in DNA

Heim, Thomas M.; Mélin, Thierry; Deresmes, D.; Vuillaume, D.

doi:10.1063/1.1794852

Cited by 36 publications

(34 citation statements)

References 16 publications

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“…Charge carriers were locally injected through the apex of the tip, and the resulting distribution and concentration of injected charges was measured by EFM following a protocol already used for pentacene monolayers and DNA molecules. [21,22] The EFM image and profile (Fig. 10) show that holes are more readily injected than electrons (hole-to-electron ratio ca.…”

Section: Electrostatic Force Microscopy Of the Samsmentioning

confidence: 99%

Low‐Operating‐Voltage Organic Transistors Made of Bifunctional Self‐Assembled Monolayers

Mottaghi

Lang

Rodriguez

et al. 2007

Adv Funct Materials

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103

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International audienceSelf-assembled monolayers (SAMs) are molecular assemblies that spontaneously form on an appropriate substrate dipped into a solution of an active surfactant in an organic solvent. Organic field-effect transistors are described, built on an SAM made of bifunctional molecules comprising a short alkyl chain linked to an oligothiophene moiety that acts as the active semiconductor. The SAM is deposited on a thin oxide layer (alumina or silica) that serves as a gate insulator. Platinum-titanium source and drain electrodes (either top- or bottom-contact configuration) are patterned by using electron-beam (e-beam) lithography, with a channel length ranging between 20 and 1000 nm. In most cases, ill defined current-voltage (I-V) curves are recorded, attributed to a poor electrical contact between platinum and the oligothiophene moiety. However, a few devices offer well-defined curves with a clear saturation, thus allowing an estimation of the mobility: 0.0035 cm2V-1 s-1 for quaterthiophene and 8 × 10-4 cm2V-1 s-1 for terthiophene. In the first case, the on-off ratio reaches 1800 at a gate voltage of -2 V. Interestingly, the device operates at room temperature and very low bias, which may open the way to applications where low consumption is required

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Section: Electrostatic Force Microscopy Of the Samsmentioning

confidence: 99%

Low‐Operating‐Voltage Organic Transistors Made of Bifunctional Self‐Assembled Monolayers

Mottaghi

Lang

Rodriguez

et al. 2007

Adv Funct Materials

Self Cite

103

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show abstract

“…19,27 As it has been demonstrated experimentally, a modification of the humidity causes variations of orders of magnitude in the conductivity of DNA. 54,55 Moreover, the recent singlemolecule experiments of Xu et al 20 suggest that the environment may strongly modified the low-bias transport properties of DNA oligomers.…”

Section: 2740mentioning

confidence: 99%

Dissipative effects in the electronic transport through DNA molecular wires

2005

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We investigate the influence of a dissipative environment which effectively comprises the effects of counterions and hydration shells, on the transport properties of short DNA wires. Their electronic structure is captured by a tight-binding model which is embedded in a bath consisting of a collection of harmonic oscillators. Without coupling to the bath a temperature independent gap opens in the electronic spectrum. Upon allowing for electron-bath interaction the gap becomes temperature dependent. It increases with temperature in the weak-coupling limit to the bath degrees of freedom. In the strong-coupling regime a bath-induced pseudo-gap is formed. As a result, a crossover from tunneling to activated behavior in the low-voltage region of the I-V characteristics is observed with increasing temperature. The temperature dependence of the transmission near the Fermi energy, t(EF), manifests an Arrhenius-like behavior in agreement with recent transport experiments. Moreover, t(EF) shows a weak exponential dependence on the wire length, typical of strong incoherent transport. Disorder effects smear the electronic bands, but do not appreciably affect the pseudo-gap formation.

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“…This point simply illustrates the lower spatial resolution of EFM compared with topography measurements, which is due to long-range electrostatic forces and the large (80-100 nm) tip-surface distance during EFM data acquisition. This change of FWHM for the charged nanotube is in practice a demonstration that the charge carried by the nanotube prior to the charging experiment is negligible, in contrast, for instance, with the case of DNA ropes deposited on similar substrates [24]. 4.12d and from the comparison between Fig.…”

Section: Experimental Illustration Of Efm Signalsmentioning

confidence: 82%

Electrostatic Force Microscopy and Kelvin Force Microscopy as a Probe of the Electrostatic and Electronic Properties of Carbon Nanotubes

Mélin

Zdrojek

Brunel

2009

Scanning Probe Microscopy in Nanoscience and Nanotechnology

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This chapter addresses recent experimental studies on carbon nanotubes and nanotube devices using electrical techniques derived from atomic force microscopy. Electrostatic force microscopy (EFM), Kelvin force microscope (KFM), and their variants are introduced. We show how EFM-related techniques are used to image the electrostatic and electronic properties of individual carbon nanotubes on insulators, to manipulate their charge state, and to measure field-emission and band-structure properties of individual nanotubes. We then describe how KFMrelated techniques can bring insight into the operation of electronic devices based on carbon nanotubes. We focus here on the case of field effect transistors, and describe how KFM techniques can be used to study charge transfers at the nanotube-contact interfaces, to assess the transport properties in carbon nanotubes, and, finally, to characterize carbon nanotube devices under operation.

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Localization and delocalization of charges injected in DNA

Cited by 36 publications

References 16 publications

Low‐Operating‐Voltage Organic Transistors Made of Bifunctional Self‐Assembled Monolayers

Low‐Operating‐Voltage Organic Transistors Made of Bifunctional Self‐Assembled Monolayers

Dissipative effects in the electronic transport through DNA molecular wires

Electrostatic Force Microscopy and Kelvin Force Microscopy as a Probe of the Electrostatic and Electronic Properties of Carbon Nanotubes

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