Author
J.M. Wiesinger
Bio: J.M. Wiesinger is an academic researcher from University of Pennsylvania. The author has contributed to research in topics: Polyaniline & Polyaniline nanofibers. The author has an hindex of 6, co-authored 6 publications receiving 907 citations.
Papers
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TL;DR: In this article, the authors showed that PANI-HCSA has a more expanded coillike conformation in m-cresol, p-Cresol and 2-chlorophenol than in chloroform, NMP, DMF and benzyl alcohol.
Abstract: Spectroscopic results indicate that camphorsulfonic acid-doped polyaniline (PANI-HCSA) has a more expanded coillike conformation in m-cresol, p-cresol, 2-chlorophenol, 2-fluorophenol and 3-ethylphenol than in chloroform, NMP, DMF and benzyl alcohol. With the UV/Vis/near IR spectroscopic method, one can easily choose an appropriate solvent to process PANI-HCSA into a highly conductive form
566 citations
TL;DR: The dramatic increase of the dielectric response in the three highest crystalline physically crosslinked polyaniline samples provides evidence for the formation of three-dimensional coupled mesoscopic metallic regions.
Abstract: We report the dependence of the microwave-frequency dielectric constant and dc conductivity on the crystallinity and local order of doped polyaniline. The dramatic increase of the dielectric response in the three highest crystalline physically crosslinked polyaniline samples provides evidence for the formation of three-dimensional coupled mesoscopic metallic regions. We report the measurement of a negative dielectric constant in polyaniline (doped with camphor sulfonic acid) demonstrating the intrinsic metallic nature of polyaniline.
151 citations
TL;DR: In this article, a distinction has been made between the effect on conductivity and tensile strength caused by 1D mechanical alignment of parent polyaniline films and the effect produced by the combination of physical crosslinking by crystalline domains and associated 1-D nematic-type alignment of amorphous material.
87 citations
TL;DR: In this article, the conductivity and tensile strength of stretch-oriented, doped, crosslinked polyaniline films were compared to those prepared from non-crosslinked films of the polymer.
63 citations
Patent•
12 Aug 1994TL;DR: In this article, the conductivity of polyaniline forms can be substantially increased by contacting the polyaniniline form with a phenolic compound that acts as a secondary dopant.
Abstract: Methods for preparing conductive polyaniline forms are provided in which the conductivity of the polyaniline form can be substantially increased by contacting the polyaniline form with a phenolic compound that acts as a secondary dopant for the polyaniline. Generally, a doped polyaniline solution is prepared in which the polyaniline is initially doped by a protonic acid and a doped polyaniline form is then prepared from this solution. The polyaniline form can then be contacted with the phenolic compound in either its vapor or liquid state, however it is preferred that the polyaniline form be maintained in either the gelatinous or solid state during the contacting step. The conductivity of the polyaniline form can be raised by a factor of up to about 500-1000.
51 citations
Cited by
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TL;DR: In this article, a poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) film is enhanced by more than 100 fold on adding some organic compounds into aqueous solutions or by treating it with organic solvents, such as ethylene glycol, 2-nitroethanol, methyl sulfoxide or 1-methyl-2-pyrrolidinone.
1,198 citations
TL;DR: The role of polymers as gas sensors, pH sensors, ion-selective sensors, humidity sensors, biosensor devices, etc., are reviewed and discussed in this article, and current trends in sensor research and also challenges in future sensor research are discussed.
1,126 citations
TL;DR: This demonstration of conjugated polymers with mobile charge carriers in nanometer channels represents a step toward the design of nanometer electronic devices.
Abstract: Conducting filaments of polyaniline have been prepared in the 3-nanometer-wide hexagonal channel system of the aluminosilicate MCM-41. Adsorption of aniline vapor into the dehydrated host, followed by reaction with peroxydisulfate, leads to encapsulated polyaniline filaments. Spectroscopic data show that the filaments are in the protonated emeraldine salt form, and chromatography indicates chain lengths of several hundred aniline rings. The filaments have significant conductivity while encapsulated in the channels, as measured by microwave absorption at 2.6 gigahertz. This demonstration of conjugated polymers with mobile charge carriers in nanometer channels represents a step toward the design of nanometer electronic devices.
1,011 citations
TL;DR: The as-prepared iodine functionalized g-CN shows enhanced electronic and optical properties, as well as increased photocatalytic activities in an assay of hydrogen evolution.
Abstract: An optimized and general synthetic strategy based on in-situ iodine modifying of polymeric graphitic carbon nitride is discussed. The as-prepared iodine functionalized g-CN shows enhanced electronic and optical properties, as well as increased photocatalytic activities in an assay of hydrogen evolution.
981 citations
TL;DR: In this article, the effects of secondary doping on polyaniline and its derivatives are shown to be based primarily on a change in molecular conformation of the polymer from "compact coil" to "expanded coil".
823 citations