Comparing and Contrasting the Effects of Iodine Doping on Different Types of Polyacetylene Films

Hall, Jeremy L.; Arbuckle, Georgia A.

doi:10.1021/ma946424t

Cited by 8 publications

(7 citation statements)

References 47 publications

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“…A limited conductivity of the patterned, iodine‐doped polyCOT most likely arises from exposure to an oxygen‐containing atmosphere prior to and during EFM imaging, and is supported by the presence of 11.5 % oxygen (O 1s) in the XPS survey spectrum of an iodine‐doped, bulk polyCOT sample (see Supporting Information). In addition, the conductivity of polyCOT depends upon polymer chain length (molecular weight)40 and the degree of iodine doping,41, 42 that is, properties that are difficult to characterize on the nanometer length scale. The important feature of our approach is that EFM measurements can distinguish between the electronic properties of two adjacent, but chemically different polymeric nanostructures with high resolution.…”

Section: Methodsmentioning

confidence: 99%

Nanopatterned Polymer Brushes by Combining AFM Anodization Lithography with Ring‐Opening Metathesis Polymerization in the Liquid and Vapor Phase

Lee

Caster

Kim

et al. 2006

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Nanopatterned polymer structures are fabricated on SiO2 by combining AFM anodization nanolithography (see upper figure) with surface‐initiated ring‐opening metathesis polymerization (ROMP, lower figure). This process offers a powerful set of tools for the fabrication of highly functional polymer brushes. The simplicity and speed of anodization lithography promises its massively parallel implementation using anodization stamps. The fabrication approach is universal and can easily be adapted to other surface initiated polymerizations.

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Section: Methodsmentioning

confidence: 99%

Nanopatterned Polymer Brushes by Combining AFM Anodization Lithography with Ring‐Opening Metathesis Polymerization in the Liquid and Vapor Phase

Lee

Caster

Kim

et al. 2006

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“…Iodine complexes of polymers are important for many reasons 1. The doping of polyacetylene films by iodine has been widely studied,2–5 and yields good electrical conductors. Nylon 6–iodine1, 6 complexes and poly(vinylpyridine)–iodine complexes can be used as electrode materials in lithium–iodide batteries.…”

Section: Introductionmentioning

confidence: 99%

Interaction between iodine and ethyl cellulose

Wang¹,

Easteal²

1999

J. Appl. Polym. Sci.

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ABSTRACT:Interaction between iodine and ethyl cellulose was investigated by immersing ethyl cellulose membranes in aqueous iodine-iodide solution (iodine doping) and incorporating iodine in the solution from which the membrane was cast. Oxygen and nitrogen permeabilities in iodine-doped ethyl cellulose decrease with an increase in the concentration of iodine in the dopant solution up to 0.003 mol L Ϫ1 and increase sharply at higher iodine concentrations, and ultraviolet-visible and far-infrared spectra indicate formation of a charge transfer complex. Differential scanning calorimetry of both types of membrane shows changes in the characteristic phase transitions of ethyl cellulose after iodine treatment, including the crystal-liquid crystal transition that has been reported to occur in ethyl cellulose. Further evidence for liquid crystal phases has been found from circular dichroism. X-ray photoelectron spectroscopy of iodine-doped ethyl cellulose films indicates that the iodine is present in two different chemical states, probably l 3 Ϫ and l 2 .

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“…The QCM previously has been used to study the in situ mass uptake of the dopant during chemical vapor phase doping of polymers such as polyacetylene. 2 The study involved simultaneous measurements of dopant mass uptake and resistance change during vapor-phase iodine doping of several types of polyacetylene. The diffusion coefficients for each polymer were determined from the QCM in a manner analogous to that utilized in the present study.…”

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confidence: 99%

Vapor-Phase Fuming Sulfuric Acid-Doped Poly(p-phenylene vinylene) as a Potential Humidity Sensor

Shah

Hanson

Arbuckle-Keil

2001

J. Electrochem. Soc.

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Vapor-phase doping of poly͑p-phenylene vinylene͒ ͑PPV͒ with fuming sulfuric acid has been investigated using the quartz crystal microbalance. Thin films of PPV were obtained on quartz crystal substrates by spin casting a precursor polymer, which is thermally converted to give the PPV product. Dopant mass uptake and the resistance of the film were recorded in situ during doping. A decrease in the resistance and therefore an increase in the conductivity of the film from the insulating to the metallic regime was observed. Mass uptake information was used to determine the dopant concentration at the maximum conductivity, the doping rate, and the diffusion coefficient of the polymer. The dopant concentration results were verified by Rutherford backscattering spectrometry and elemental analysis. The observation that the doped material tends to lose its metallic properties upon exposure to moisture in the atmospheric air has been used to investigate its potential as a humidity-sensing device. The golden metallic appearance of the film changes as well. The conductivity can be returned by application of a dynamic vacuum. Fuming sulfuric acid-doped films were exposed to a range of relative humidities, from 4 to 75%. A rapid and significant linear response ͑over four orders of magnitude͒ to all percent humidities was observed. Fuming sulfuric acid-doped PPV may have the potential for applications as a humidity sensor or as a disposable shut-off switch in moisture-sensitive devices.

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Comparing and Contrasting the Effects of Iodine Doping on Different Types of Polyacetylene Films

Cited by 8 publications

References 47 publications

Nanopatterned Polymer Brushes by Combining AFM Anodization Lithography with Ring‐Opening Metathesis Polymerization in the Liquid and Vapor Phase

Nanopatterned Polymer Brushes by Combining AFM Anodization Lithography with Ring‐Opening Metathesis Polymerization in the Liquid and Vapor Phase

Interaction between iodine and ethyl cellulose

Vapor-Phase Fuming Sulfuric Acid-Doped Poly(p-phenylene vinylene) as a Potential Humidity Sensor

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