Observation of persistent photoconductivity at room temperature in ferrocene-doped poly(methyl methacrylate) thin films containing chloroform molecules

Thander, Alfazuddin; Mallik, Biswanath

doi:10.1016/s0038-1098(01)00459-8

Cited by 26 publications

(13 citation statements)

References 22 publications

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“…[36] Photooxidation of ferrocene with chloroform within a poly(methyl methacrylate) (PMMA) matrix has recently been reported to give a photoconductive material. [25] However, examples of photoconductivity in polymeric ferrocene-based materials are exceptionally rare. Nishihara et al have reported that doping of oligoferrocenylenes with tetracyanoethylene (TCNE) gives charge-transfer complex-bearing materials that exhibit photoconductivity, though the molecular weights of the materials studied were all under 5 000.…”

Section: Conductivity Measurements On Photooxidized Pfmps Filmsmentioning

confidence: 99%

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Photooxidation and Photoconductivity of Polyferrocenylsilane Thin Films

Cyr¹,

Tzolov²,

Manners³

et al. 2003

Macro Chemistry & Physics

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Irradiation of thin films of poly(ferrocenylmethylphenylsilane) ([Fe(η5‐C5H4)2SiMePh]n) cast from chloroform solution with UV light leads to photooxidation of ferrocene centers in the polymer main chain. The extent of the polymer oxidation can be controlled in the range ca. 0–5% by the duration of the irradiation exposure and by the concentration of chloroform. The photooxidized polyferrocenylsilane material is conductive, with an increased conductivity of greater than three orders of magnitude relative to the unoxidized material. In addition, the photooxidized polymers have been found to be photoconductive. The photooxidation process can be reversed by means of chemical reduction using hydrazine or decamethylferrocene, leading to the regeneration of the neutral polymers. However, substantial molecular weight decline was detected during the photooxidation/reduction process, presumably as a result of chain cleavage reactions induced by the anionic or radical chlorinated photoproducts. Methylation of the cyclopentadienyl rings of the ferrocene moiety in the polymer was found to lead to materials which are significantly more stable.Time trace of the current at constant applied voltage of 100 V for a PFS film upon illumination. The ON and OFF states were created by using a mechanical shutter.magnified imageTime trace of the current at constant applied voltage of 100 V for a PFS film upon illumination. The ON and OFF states were created by using a mechanical shutter.

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Section: Conductivity Measurements On Photooxidized Pfmps Filmsmentioning

confidence: 99%

“…[23,24] The resulting composite material was reported to exhibit photoconductivity. [25] Because of our interest in the electrical properties of ferrocene-containing polymers, we have explored the potential of photooxidation of PFS in the presence of CHCl 3 .…”

Section: Introductionmentioning

confidence: 99%

Photooxidation and Photoconductivity of Polyferrocenylsilane Thin Films

Cyr¹,

Tzolov²,

Manners³

et al. 2003

Macro Chemistry & Physics

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“…Poly(methyl methacrylate) (PMMA) exhibits several interesting properties, combining excellent optical characteristics (clarity, transparency from near UV to near IR), thermal stability, mechanical and electrical properties, weather resistance, and easy shaping. Accordingly, PMMA‐based materials currently find applications in many technological and productive fields 1–7. However, PMMA is still suffering from some drawbacks, e.g., in terms of barrier properties but also scratch (abrasive) resistance, limiting their use in some specific areas.…”

Section: Introductionmentioning

confidence: 99%

Combining atom transfer radical polymerization and melt compounding for producing PMMA/clay nanocomposites

Lerari

Peeterbroeck

Benali

et al. 2011

J of Applied Polymer Sci

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Nanocomposites based on poly (methyl methacrylate) (PMMA) and 3 wt % of clay (montomorillonite) organomodified with alkylammonium cations bearing alkyl halide function (OCTANBr i BBr-CL) have been obtained by melt blending. The ''nanohybrid'' masterbatch approach, already used within other matrices, has also been tested to produce this type of material. Accordingly, highly filled ($ 30 wt %) PMMA-OCTANBr i BBr-CL nanohybrid has been synthesized by atom transfer radical polymerization (ATRP) of MMA as in situ initiated from the alkyl halide functions decorating the nanoclay surface. This nanohybrid, i.e., PMMA-grafted organomodified clay, has been added as masterbatch and melt-blended within commercial PMMA. A significantly better clay nanoplatelet dispersion of the samples prepared via the masterbatch process was evidenced by wide-angle X-ray diffraction (WAXD) and transmission electron microscopy (TEM). As a result, these exfoliated nanocomposites proved to be characterized by better thermal and mechanical properties than the more conventional physical blends, as evidenced by thermogravimetrical analysis (TGA) and dynamical mechanical analysis (DMTA), respectively.

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“…(1) excellently. The corresponding growth time constant for the photoexcitation at 215 was found to be $407 s. The decay curve has been fitted by the similar type of equation as formulated by Dissanayake et al [28][29][30] I phðt¼tÞ ¼ I phðt¼1Þ þ ðI phðt¼0Þ À I phðt¼1Þ Þexp½Àðt À t 0 Þ=k 0 ;…”

Section: Resultsmentioning

confidence: 92%