Electrical conduction in liquid and solid octadecane

Noble, Ian; Taylor, David

doi:10.1088/0022-3727/13/11/021

Cited by 8 publications

(11 citation statements)

References 10 publications

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“…It is likely, therefore, that diffusion of water into the device resulted in an ionic current in the gate dielectric. The decreasing current in the repeat measurements is probably caused by removal of mobile ionic species out of the dielectric by the applied electric field, a process that is well recognized in insulating materials …”

Section: Results and Discussionmentioning

confidence: 91%

Effect of Oxygen, Moisture and Illumination on the Stability and Reliability of Dinaphtho[2,3-b:2′,3′-f]thieno[3,2-b]thiophene (DNTT) OTFTs during Operation and Storage

Ding

Abbas

Assender

et al. 2014

ACS Appl. Mater. Interfaces

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We report a systemic study of the stability of organic thin film transistors (OTFTs) both in storage and under operation. Apart from a thin polystyrene buffer layer spin-coated onto the gate dielectric, the constituent parts of the OTFTs were all prepared by vacuum evaporation. The OTFTs are based on the semiconducting small molecule dinaphtho[2,3-b:2',3'-f]thieno[3,2-b]thiophene (DNTT) deposited onto the surface of a polystyrene-buffered in situ polymerized diacrylate gate insulator. Over a period of 9 months, no degradation of the hole mobility occurred in devices stored either in the dark in dry air or in uncontrolled air and normal laboratory fluorescent lighting conditions. In the latter case, rather than decreasing, the mobility actually increased almost 2-fold to 1.5 cm(2)/(V · s). The devices also showed good stability during repeat on/off cycles in the dark in dry air. Exposure to oxygen and light during the on/off cycles led to a positive shift of the transfer curves due to electron trapping when the DNTT was biased into depletion by the application of positive gate voltage. When operated in accumulation, negative gate voltage under the same conditions, the transfer curves were stable. When voltage cycling in moist air in the dark, the transfer curves shifted to negative voltages, thought to be due to the generation of hole traps either in the semiconductor or its interface with the dielectric layer. When subjected to gate bias stress in dry air in the dark for at least 144 h, the device characteristics remained stable.

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Section: Results and Discussionmentioning

confidence: 91%

Effect of Oxygen, Moisture and Illumination on the Stability and Reliability of Dinaphtho[2,3-b:2′,3′-f]thieno[3,2-b]thiophene (DNTT) OTFTs during Operation and Storage

Ding

Abbas

Assender

et al. 2014

ACS Appl. Mater. Interfaces

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“…Although this initial resistance was high, it is still lower than the ∼1 × 10 4 MΩ·cm 2 that would be expected for if the alumina pores were filled with air. An even higher resistance (>1 × 10 7 MΩ·cm 2 ) would be expected if the pores were completely filled with octadecane . This letter examines the possibility that ionic conduction occurs as a result of surface transport within the alkylsilane layer.…”

Section: Introductionmentioning

confidence: 99%

“…An even higher resistance (>1 × 10 7 MΩ‚cm 2 ) would be expected if the pores were completely filled with octadecane. 14 This letter examines the possibility that ionic conduction occurs as a result of surface transport within the alkylsilane layer. Three sets of experiments were performed to test this hypothesis.…”

Section: Introductionmentioning

confidence: 99%

Evidence of Ion Transport through Surface Conduction in Alkylsilane-Functionalized Nanoporous Ceramic Membranes

Ruud

Early

et al. 2006

Langmuir

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Alkylsilane-modified nanoporous ceramic membranes exclude water from their pores yet exhibit transmembrane electrical conductivity in aqueous electrolyte solutions. That effect was studied using impedance spectroscopy and (29)Si NMR. Anodic aluminum oxide membranes with alkylsilane-functionalized pores exhibited a transmembrane electrical resistance that increased with the length of the hydrocarbon chain. Microstructural studies revealed that the conduction was due primarily to a small number of "hydrophilically defective" pores in membranes modified by long-chain alkylsilanes and both hydrophilic defects and surface conduction in pores modified by short-chain alkylsilanes. Hydroxyl groups in short-chain alkylsilane layers act as "water wires" to enable surface ion transport. The local concentration of hydroxyl groups decreased with alkylsilane chain length, explaining the resistance trend. This constitutes the first direct evidence that alkylsilane functionalization affects electrical as well as wetting properties.

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“…The octadecane was obtained from Koch-Light Laboratories Ltd and purified by zone refining (Noble 1979). Several methods of crystal growth were considered, viz growth from a solvent, sublimation from the vapour phase and growth from the melt.…”

Section: Sample Preparationmentioning

confidence: 99%

“…In a previous paper (Noble and Taylor 1980) the results of an investigation into the electrical conduction properties of n-octadecane were reported. The measurements were carried out over a range of temperature which spanned the melting point at 28.1 "C and indicated clearly that ion transport predominated in the liquid phase.…”

Section: Introductionmentioning

confidence: 99%

Electrical conduction in n-octadecane crystals

Taylor

Noble

1980

J. Phys. D: Appl. Phys.

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The currents flowing along two crystal directions, viz. parallel with and perpendicular to the molecular axis, were monitored but an apparent anisotropy in the conduction properties was removed by a voltage conditioning procedure. It is concluded that n-octadecane does not show an intrinsic DC conduction process when pure, defect-free crystals are grown. The voltage step-responses of the crystals do, however, show the logarithmic time dependence which is common to a wide range of insulators and semiconductors. Comparisons are made with results presented previously on liquid and polycrystalline n-octadecane.

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Electrical conduction in liquid and solid octadecane

Cited by 8 publications

References 10 publications

Effect of Oxygen, Moisture and Illumination on the Stability and Reliability of Dinaphtho[2,3-b:2′,3′-f]thieno[3,2-b]thiophene (DNTT) OTFTs during Operation and Storage

Effect of Oxygen, Moisture and Illumination on the Stability and Reliability of Dinaphtho[2,3-b:2′,3′-f]thieno[3,2-b]thiophene (DNTT) OTFTs during Operation and Storage

Evidence of Ion Transport through Surface Conduction in Alkylsilane-Functionalized Nanoporous Ceramic Membranes

Electrical conduction in n-octadecane crystals

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