Laser-induced generation of highly conducting areas in poly(bis-alkylthioacetylenes)

Roth, H.-K.; Gruber, H.; Fanghänel, E.; Richter, A. M.; Hörig, W.

doi:10.1016/0379-6779(90)90142-8

Cited by 17 publications

(6 citation statements)

References 13 publications

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“…The latter value is close to that (A0 = 22-23 o) realized, e.g., at the transition from the benzoid to the quinoid form in PPP [30], at the transition from the emeraldine-base to the emeraldine-salt form of polyaniline [31], and at the transition from PTTF with phenyl bridges to PTTF with tetrahydroanthracene ones [12]. This change in the g-factor supports the assumption made by Roth et al [14] that laser irradiation leads to a more planar structure of the polymer chains and therefore to a higher spin delocalization and to a higher conductivity of PATAC.…”

Section: Spin Composition and Susceptibility Of Patac Samplessupporting

confidence: 78%

“…The total spin concentration increases by the maximum factor of 30 at the PATAC treatment. On the other hand, the concentration of charge carriers was determined from Hall and dc conductivity studies to change by more than 15 orders of magnitude reaching N ~ 1019 cm -3 in the relatively strongly laser-irradiated polymer [14]. This means that the charge, as in the case of some other conducting polymers, is predominantly transferred by paramagnetic polarons in an initial and slightly modified PATAC.…”

Section: Spin Composition and Susceptibility Of Patac Samplesmentioning

confidence: 99%

“…From the average room temperature mobility ~ ~ 0.5 cmZ/(V 9 s) obtained by the Hall study for charge car¡ in highly irradiated polymer [14] one can evaluate the intrinsie conductivity to be close to 0.34 S/cm. However, cr~.…”

Section: Spin Dynamics In Laser-modified Patac Samplesmentioning

confidence: 99%

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Spin charge carrier dynamics in poly(bis-alkylthioacetylene)

2002

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Initial and laser-irradiated poly(bis-alkylthioacetylene) (PATAC) samples were investigated by electron paramagnetic resonance (EPR) at X-band (9.6 GHz), Q-band (37 GHz), and D-band (140 GHz) in a wide temperature range. Two types of paramagnetic centers were proved to exist in lasermodified polymer, namely, localized and mobile polarons with the concentration ratio and susceptibility depending on the irradiation dose and temperature. Superslow torsion motion of the polymer chains was studied by the saturation transfer method at D-band EPR. Additional information on the polymer chain segment dynamics was obtained by the spin probe method at X-band EPR. Spin-spin and spin-lattice relaxation times were measured separately by the steady-state saturation method at D-band EPR. Intrachain and interchain spin diffusion coefficients and conductivity arising from the polaron dynamics were calculated. It was shown that the polaron dynamics in laser-modified polymer is affected by the spin-spin interaction. The interchain charge transfer is stimulated by torsion motion of the polymer chains, whereas the total conductivity of irradiated PATAC is determined mainly by the dynamics of diamagnetic charge carriers. Magnetic, relaxation and dynamics parameters of PATAC were also shown to change during polymer storage.

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Section: Spin Composition and Susceptibility Of Patac Samplessupporting

confidence: 78%

Section: Spin Composition and Susceptibility Of Patac Samplesmentioning

confidence: 99%

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Spin charge carrier dynamics in poly(bis-alkylthioacetylene)

2002

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“…12 An exception is an investigation of laserirradiated poly͑bis-alkylthioacetylene͒, which found temperature trends similar to those of bombarded BBL, although fewer carriers of higher mobility. 13 As a check on our results, the Hall effect and for sample 8 were used to calculate a mean free path L. Adopting a spherical Fermi surface, we find Lϭ F ϭ1.4 Å, on the order of the interatomic spacing, confirming substantial disorder. Sample inhomogeneity is also possible.…”

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confidence: 66%

Hall-effect study of an ion-bombarded polymer

Long

Washburn

Chen

et al. 1996

Journal of Applied Physics

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We report an extended Hall-effect study of ion-bombarded poly͑benzimididazobenzophenanthroline ladder͒, which resembles a disordered metal. We have investigated the dependence of carrier concentration and mobility on ion energy and sample temperature during bombardment and on measurement temperature. The dramatic increases in mobility and conductivity with bombardment energy and temperature indicate increased cross-link density. Concomitant slight decreases in carrier concentration may result from fewer defects in the cross-linked network. The mobility decreases slightly with measurement temperature while the conductivity is dominated by the gradually increasing carrier density.

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“…The conversion process is assumed to be a thermally supported photoreaction. If the initial substances are heated to 500° C without illumination, no significant conductivity charge is observed despite the blackish colour of the modification products 345…”

Section: Basic Principlementioning

confidence: 99%

Laser Recording of Circuit Structures from Conducting Polymers in Insulating Polymer Layers

Roth

Eidner²

1996

Circuit World

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The paper is a report on a newly developed material and on technological studies which open up new methods for the combined application of laser and computer technology for advanced industrial applications, e.g., for the laser direct imaging of conducting paths, circuit structures in printed circuit boards and probably also in moulded interconnection devices. The process uses — instead of copper and photoresists — layers of a special polymer poly(bis‐alkylthio‐acetylene), PATAC, in which leads or conducting organic structures will be written by laser‐induced local conversion of PATAC into conductive polymer tracks. The organic leads obtained can be reinforced by electroplating if necessary. It is a purely additive process, which works without etching, thus avoiding environmental problems. The new material and technology also allow the direct imaging of resistors, capacitors and inductors on to printed circuit boards and make it possible to make chips and other electronic components conductive. It enables the production of leads in the 10 μm scale and for this reason is suitable for hybrid technology. The new technology is not restricted to one plane and can, therefore, also be used for 3‐D boards or MIDs.

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Laser-induced generation of highly conducting areas in poly(bis-alkylthioacetylenes)

Cited by 17 publications

References 13 publications

Spin charge carrier dynamics in poly(bis-alkylthioacetylene)

Spin charge carrier dynamics in poly(bis-alkylthioacetylene)

Hall-effect study of an ion-bombarded polymer

Laser Recording of Circuit Structures from Conducting Polymers in Insulating Polymer Layers

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