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- W90094798 abstract "A study was made of the preparation and the electrical character of semi-conductors made of nickel-doped polymer carbon. These materials were made from various nickel loaded-ion exchange resins which were then pyrolyzed to temperatures ranging from 700°C to 1200°C and in yields of about 13%, based on dry resin. The electrical conductivity and its temperature coefficient and the Hall coefficient were studied, and the pyrolysis and conduction mechanisms were examined. Nickel contents up to 12 atom % were studied. The conductivity is generally found to increase as the pyrolysis temperature or impurity concentration is increased. As expected from theory and from the already high concentration of carriers in polymer carbon, (activation energies of about 0.01 to 0.07 eV) high concentration of impurity (about 1 atom %) is needed to materially affect the conductivity. For example, in polymer carbons prepared at 800°C, which exhibited an activation energy of about 0.07 eV, the addition of about 1 atom % Ni caused a change in conductivity of about 20%, whereas, in polymer carbons prepared at 1000°C and 1200°C with activation energies of 0.01–0.02 eV, addition of up to about 6 atom % Ni caused little change in conductivity, but 11.5 atom % caused a fourfold increase. This conveniently high working level of impurity for semi-conductor modification is to be compared with that in Ge (parts per million or less) or Si (parts per billion). Interpretation of the Hall coefficients and the high ferromagnetism of the nickel-doped samples suggests that the addition of Ni to polymer carbon increases the “hole” density. This may be pictured as due to raising the Fermi level by the electrons from the Ni, in an extension of the Mrozowski theory of polymer carbons. This behavior is interpretable qualitatively, with a two-conductor model." @default.
- W90094798 created "2016-06-24" @default.
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- W90094798 date "1960-01-01" @default.
- W90094798 modified "2023-09-23" @default.
- W90094798 title "SEMICONDUCTION IN NICKEL-DOPED POLYMER CARBONS" @default.
- W90094798 doi "https://doi.org/10.1016/b978-1-4831-9835-4.50036-7" @default.
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