Alkyl Substituent Effects on the Conductivity of Polyaniline

Zaidi, N. A.; Foreman, Joel P.; Tzamalis, Georgios; Monkman, S. C.; Monkman, A. P.

doi:10.1002/adfm.200305488

Cited by 38 publications

(39 citation statements)

References 32 publications

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“…With increased packing and order of molecules, charge mobility substantially increases in high molecular weight and less branched PF and poly(3‐hexylthiophene) P3HT [6, 7]. Similar results were observed in the case of polyaniline (PANI) that was synthesized with fewer defect sites and with higher molecular weight, which led to improvements in its mechanical and electrical properties [8–12]. Monkman and coworkers [10] evaluated whether or not low molecular weight and/or non‐para coupling is the reason for the lower conductivity of branched and low molecular weight PANI.…”

Section: Introductionmentioning

confidence: 75%

Synthesis and characterization of high molecular weight polyaniline for organic electronic applications

Ramamurthy

Mallya

Joseph

et al. 2012

Polymer Engineering & Sci

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High molecular weight polyaniline (PANI) was synthesized by a combined procedure incorporating various synthesis methods. Temperature and open circuit potential of the reaction mixture were collected to monitor the reaction progress. The polymer is characterized by various techniques including gel permeation chromatography, dynamic light scattering, infrared spectroscopy, solid‐state nuclear magnetic resonance, and differential scanning calorimetry for elucidating the molecular architecture obtained by this method. As‐synthesized PANI was found to possess high molecular weight, reduced branching, reduced cross‐linking, and to predominantly consist of linear polymer chains. This polymer was also found to be more stable in solution form. J–V characteristics of as‐synthesized PANI films indicate a high current density which is due to increased free pathways and less traps for the charge transport to occur in PANI films. POLYM. ENG. SCI., 2012. © 2012 Society of Plastics Engineers

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Section: Introductionmentioning

confidence: 75%

Synthesis and characterization of high molecular weight polyaniline for organic electronic applications

Ramamurthy

Mallya

Joseph

et al. 2012

Polymer Engineering & Sci

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“…Self-doped polypyrrole (SPPy) can be achieved by sulfonation of polypyrrole with fluorosulfonic treatment (see Electronic Supplementary Material Fig. S1) [29]. It is further improved by the presence of the -SO 3 − group on the ring of pyrrole due to its strong electron withdrawing properties [30].…”

Section: Introductionmentioning

confidence: 99%

A strategy to enhance the thermal stability of a nanostructured polypyrrole-based coating for solid phase microextraction

et al. 2012

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We report on a nanostructured self-doped polypyrrole (SPPy) film that was prepared by an electrochemical technique in an electrolyte containing fluorosulfonic acid as the sulfonation reagent. The film was applied as a new fiber material for solid-phase microextraction (SPME) of the pesticides lindane, heptachlor, aldrin, endosulfans I and II prior to their quantitation by GC with electron capture detection. The SPPy nanoparticles have a diameter of <100 nm. The introduction of covalently bound sulfo groups into the backbone of the polymer resulted in improved temperature resistance (~350°C) and satisfactory extraction efficiency. The thermal stability of the SPPy fiber is superior to common polypyrrole fibers. Extraction was optimized by means of the Taguchi orthogonal array experimental design with an OA 16 (4 5 ) matrix including extraction temperature, extraction time, salt concentration, stirring rate, and headspace volume. The method displays good repeatability (RSD<6%) and linearity (in the range from 0.78 to 100 ng mL −1 ; with an R 2 of >0.998. The detection limits are <0.23 ng mL −1 . The method was successfully applied to the analysis of the pesticides in skimmed milk and fruit juice samples, and recoveries are from 84±1 to 105±1%.

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“…[28] Figure 7a shows the TDOS and PDOS together with the COOP for the (MgNH)(LiNH 2 ) 5 cluster. The HOMO-LUMO gap of (MgNH)(LiNH 2 ) 5 is 2.25 eV, which is much narrower than the 3.30 eV gap of (LiNH 2 ) 6 .…”

Section: Mg Substitution Effect On the Bonding Of Lithium Amidementioning

confidence: 99%

A Quantum‐Chemical Study on Understanding the Dehydrogenation Mechanisms of Metal (Na, K, or Mg) Cation Substitution in Lithium Amide Nanoclusters

Peng

Tao

et al. 2010

Adv Funct Materials

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The hydrogen‐releasing activity of (LiNH2)6–LiH nanoclusters and metal (Na, K, or Mg)‐cation substituted nanoclusters (denoted as (NaNH2)(LiNH2)5, (KNH2)(LiNH2)5, and (MgNH)(LiNH2)5) are studied using ab initio molecular orbital theory. Kinetics results show that the rate‐determining step for the dehydrogenation of the (LiNH2)6–LiH nanocluster is the ammonia liberation from the amide with a high activation energy of 167.0 kJ mol−1 (at B3LYP/6‐31 + G(d,p) level). However, metal (Na, K, Mg)‐cation substitution in amide–hydride nanosystems reduces the activation energies for the rate‐determining step to 156.8, 149.6, and 144.1 kJ mol−1 (at B3LYP/6‐31 + G(d,p) level) for (NaNH2)(LiNH2)5, (KNH2)(LiNH2)5, and (MgNH)(LiNH2)5, respectively. Furthermore, only the −NH2 group bound to the Na/K cation is destabilized after Na/K cation substitution, indicating that the improving effect from Na/K‐cation substitution is due to a short‐range interaction. On the other hand, Mg‐cation substitution affects all –NH2 groups in the nanocluster, resulting in weakened N–H covalent bonding together with stronger ionic interactions between Li and the –NH2 group. The present results shed light on the dehydrogenation mechanisms of metal‐cation substitution in lithium amide–hydride nanoclusters and the application of (MgNH)(LiNH2)5 nanoclusters as promising hydrogen‐storage media.

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Alkyl Substituent Effects on the Conductivity of Polyaniline

Cited by 38 publications

References 32 publications

Synthesis and characterization of high molecular weight polyaniline for organic electronic applications

Synthesis and characterization of high molecular weight polyaniline for organic electronic applications

A strategy to enhance the thermal stability of a nanostructured polypyrrole-based coating for solid phase microextraction

A Quantum‐Chemical Study on Understanding the Dehydrogenation Mechanisms of Metal (Na, K, or Mg) Cation Substitution in Lithium Amide Nanoclusters

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