The semiconductivity of organic substances. Part 2

Eley, D. D.; Parfitt, G. D.

doi:10.1039/tf9555101529

Cited by 158 publications

(49 citation statements)

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“…18,19 The thin film (diameter, 1 cm; thickness, 1 mm) was tightly adjusted between the plates of two copper electrodes of an electric cell. The cell was put in an electric furnace that was connected to a thermocouple for measuring the temperature.…”

Section: Measurement Of Specific Electric Conductivitymentioning

confidence: 99%

Effect of doping polyacrylic acid with some dopants as studied by different techniques

Mostafa

Mohamed

2002

J of Applied Polymer Sci

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ABSTRACT:The molecular weight of polyacrylic acid (PAA) was determined by a viscometric method using NaNO 3 as solvent at 30°C. The specific electric conductivities () of PAA as well as PAA doped with carbon black (CB), chromium oxide (Cr 2 O 3 ), and cupferron with different concentrations (from 0.25 to 1 wt %) were measured at a temperature range 360 -400 K. IR spectra of some polymers were determined and it was shown that when PAA was doped with 0.5 wt % CB, a COOOC band appeared at 775-875 cm Ϫ1 . The positron annihilation lifetime (PAL) spectra in PAA doped with the above-mentioned dopants were measured as a function of their concentrations. It was observed that the short lifetime intensity I 1 decreased, whereas the intermediate lifetime intensity I 2 , which is related to the conductivity of the material, increased with increasing the wt % of Cr 2 O 3 and cupferron as well as at low concentrations of CB. These results are discussed in terms of the conducting island model. It was found that there were distinct positive relationships between and I 2 .

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Section: Measurement Of Specific Electric Conductivitymentioning

confidence: 99%

Effect of doping polyacrylic acid with some dopants as studied by different techniques

Mostafa

Mohamed

2002

J of Applied Polymer Sci

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“…This idea initiated research on the band structure and semiconducivity of organic molecules [111][112][113][114][115], which resulted in multiple attempts to apply semiconductor theory to describe the adsorption-induced conductivity changes of biopolymers [116][117][118][119][120][121]. Recently, near room temperature hopping conduction of ionic charge carriers and holes was suggested in onedimensional TiO x [122] and Mo 6 S y I z [123,124] nanostructures and certain biopolymers [125,126], which was gradually replaced by fluctuation induced tunneling with decreasing temperature [127].…”

Section: Surface Conducting Mechanismsmentioning

confidence: 99%

Atomic scale characterization and surface chemistry of metal modified titanate nanotubes and nanowires

Kukovecz

Kordás

Kiss

2016

Surface Science Reports

102

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Titanates are salts of polytitanic acid that can be synthesized as nanostructures in a great variety concerning crystallinity, morphology, size, metal content and surface chemistry.Titanate nanotubes (open-ended hollow cylinders measuring up to 200 nm in length and 15 nm in outer diameter) and nanowires (solid, elongated rectangular blocks with length up to 1500 nm and 30-60 nm diameter) are the most widespread representatives of the titanate nanomaterial family. This review covers the properties and applications of these two materials from the surface science point of view. Dielectric, vibrational, electron and X-ray spectroscopic results are comprehensively discussed first, then surface modification methods including covalent functionalization, ion exchange and metal loading are covered. The versatile surface chemistry of onedimensional titanates renders them excellent candidates for heterogeneous catalytic, photocatalytic, photovoltaic and energy storage applications, therefore, these fields are also reviewed.

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“…they behave as semiconductors. Eley and Par®tt [1,2] have shown that some chelated compounds like phthalocyanin and copper-phthalocyanin have semiconducting properties. Organic compounds with paramagnetic properties are found among simple organic molecules [3,4], proteins [5] dyes [6] and chelated compounds as well as polymers [7].…”

Section: Introductionmentioning

confidence: 99%

Comparison Between the Electric Conductivity of Polyhydroxamic Acids of Different Origin

Sayed

Abed

Gad

et al. 1998

Monatshefte fuer Chemie

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The semiconductivity of organic substances. Part 2

Abstract: t The " energy gap " is the term AE in the equation for the conductivity K = KO exp (-Ae/2kT) and is usually given in electron-volts (see ref.(17)). The earlier paper 4 gave A 4 2 values in kcal/mole, listed as E.

Cited by 158 publications

References 0 publications

Effect of doping polyacrylic acid with some dopants as studied by different techniques

Effect of doping polyacrylic acid with some dopants as studied by different techniques

Atomic scale characterization and surface chemistry of metal modified titanate nanotubes and nanowires

Comparison Between the Electric Conductivity of Polyhydroxamic Acids of Different Origin

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