Electrical properties of I2-doped polydiacetylene

Ebisawa, Fumihiro; Kurihara, Takashi; Tabei, Hisao

doi:10.1016/0379-6779(87)90918-0

Cited by 8 publications

(4 citation statements)

References 8 publications

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“…47 The energy of chemically doped DCH in a single crystal was estimated to be 200 meV. 48 The activation energy of the ladder polymer was comparable with those of PDA single crystals, although the samples were compacted pellets.…”

Section: Resultsmentioning

confidence: 98%

Preparation and properties of two-legged ladder polymers based on polydiacetylenes

et al. 2012

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A novel diacetylene derivative, N,N 0 -bis[5-(3-tolylaminocarbonyloxy)-1,3-pentadiynyl]-N,N 0 -diphenyl-1,4-phenylenediamine (1), was prepared, where two diacetylene groups were connected by a 1,4phenylenediamine moiety. The molecules stacked one-dimensionally and showed solid-statepolymerization reactivity above 80 C. The decay of the monomers at 100 C proceeded gradually without a marked induction period and was fully completed after 400 h. The obtained polymer was a crystalline solid judged by powder X-ray diffraction (PXRD) patterns and SEM imaging. The conjugated p-system of the obtained polymer was classified as a two-legged conjugated ladder. The polymer showed a broad absorption from the visible to the near IR region, indicating a decrease in the optical band gap of ca. 1.0 eV, because of the expansion of the p-conjugated system from a onedimensional system to a ladder. The ladder polymer showed high conductivity after I 2 doping from s 293K ¼ 5 Â 10 À12 S cm À1 to 1.2 Â 10 À5 S cm À1 . The conductivity depended heavily on the pressure of iodine and reached s 373K ¼ 2.3 Â 10 À1 S cm À1 . The activation energy of the ladder polymer was also estimated as 360 meV.

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Section: Resultsmentioning

confidence: 98%

Preparation and properties of two-legged ladder polymers based on polydiacetylenes

et al. 2012

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“…Slow dopant transport is commonly observed in conducting polymers possessing dense morphologies, such as "Durham" polyacetylene,29 and is sufficient to completely prevent doping in highly ordered single crystals of poly (diacetylenes). 30 In the present case, blending PPV with PEO in the manner described results in greatly enhanced doping rates.…”

Section: Resultsmentioning

confidence: 57%

Morphology, doping, and electrical properties of poly(p-phenylenevinylene)/poly(ethylene oxide) blends

Machado¹,

Schlenoff²,

Karasz³

1989

Macromolecules

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“…We believe that these processes are useful for fabricating microelectrodes with complicated shapes. We also note that iodine is excellently soluble in cyclohexane, suggesting a convenient doping method that can replace the vapor exposure technique generally used in PDA crystalline systems. − …”

Section: Resultsmentioning

confidence: 98%

“…The π-conjugated chains of PDA change their conformations under an external stimulus (e.g., heat, − mechanical stress, − light, , or chemical species − ). Because this conformational change affects their apparent colors, PDAs have been widely studied as chemical and physical sensors. , When doped with an appropriate electron donor such as iodine, PDAs function as electroconductive materials. − However, PDAs are densely packed in crystal form and are poorly soluble in common organic solvents. , Because they are difficult to manipulate to coat or mold into the desired shapes, PDAs are rarely explored for sophisticated applications, and most of the PDA research is limited to fundamental and laboratory-scale studies with a few exceptions, such as DA-based radiation-sensitive dosimetric films . Furthermore, in crystalline systems, irradiated ultraviolet (UV) light is mainly absorbed near the surface of the crystals, causing heterogeneous photopolymerization in the depth direction.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Properties of Aromatic-Terminated Diacetylene Organogelators and Their Application to Photopatterning of Polydiacetylenes

et al. 2021

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A series of simply structured diacetylene-diamide-based gelators (DAGs) with aromatic terminals were synthesized, and their gelation and subsequent photopolymerization abilities were analyzed. DAGs with an adequate spacer length (n) and tolyl terminals (DA-T n ) interacted with aromatic solvents, such as benzene and xylenes, at elevated temperatures. During the subsequent cooling process, the DAGs interacted with each other through CH−π interactions at their terminal positions. They also formed one-dimensional hydrogen bonding arrays through secondary amides, leading to stable organogels. These gels polymerized into π-conjugated polydiacetylenes (PDAs) under ultraviolet irradiation. In the p-xylene gels of DA-T n , the spacer length exerted characteristic odd–even effects on the photopolymerization rates over a certain range (n = 3–6), which can be explained by periodic changes in the uniformity of the molecular packing modes. When the gelling solvent was changed to cyclohexane, the gelation and photopolymerization abilities were greatly improved because the DA-T n gel networks became highly crystallized and transparent to ultraviolet light (254 nm). The ultimate conversion to PDA from DA-T8/cyclohexane gels was 45.2 wt %. Applying photolithographic techniques to the DAG with excellent photopolymerizability in the film state, we successfully fabricated microscale photopatterns of PDA. We also established a convenient removal process (development process) of DA monomers in unexposed areas. The resulting PDA patterns were quite stable to ambient light stimuli.

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Electrical properties of I2-doped polydiacetylene

Cited by 8 publications

References 8 publications

Preparation and properties of two-legged ladder polymers based on polydiacetylenes

Preparation and properties of two-legged ladder polymers based on polydiacetylenes

Morphology, doping, and electrical properties of poly(p-phenylenevinylene)/poly(ethylene oxide) blends

Synthesis and Properties of Aromatic-Terminated Diacetylene Organogelators and Their Application to Photopatterning of Polydiacetylenes

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