Composites of Intrinsically Conducting Polymers as Sensing Nanomaterials

Hatchett, David W.; Josowicz, Mira

doi:10.1021/cr068112h

Cited by 612 publications

(352 citation statements)

References 207 publications

(312 reference statements)

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“…Nevertheless, nonuniversal behavior has been experimentally observed and theoretically predicted in the last years. 20,21,30,[43][44][45][46] The above definition ͓Eq. ͑8͔͒ holds for the whole range of percolation probabilities, that is, even for p not close to p c .…”

Section: Conduction Criterions and General Relationshipsmentioning

confidence: 99%

A model for the dependence of the electrical conductance with the applied stress in insulating-conducting composites

Negri

Rodríguez

Bernik

et al. 2010

Journal of Applied Physics

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A model for the dependence of the electrical conductance, G, with the strain induced by external mechanical stress in conducting particles-polymer composites is presented. The model assumes that the percolation probability between neighboring particles must depart from a scale-invariant behavior but saturate at moderated-high strains, reaching percolation path's saturation, with sigmoid dependence. This dependence is obtained by proposing a dynamic picture where contacts or bonds between neighboring particles are created but also destructed when a stress is applied and relatively moderated or high strains, , are produced in the composite. The electrical conductance of prepared graphite-polydimethylsiloxane composites were measured as function of the applied pressure and fitted by the presented model. The elastic response to the uniaxial compression was studied using a texture analyzer. The possibility of nonuniversal effects in the conduction critical exponent, t, was taken into account. It is concluded that the saturation of the response in the G versus plots cannot be assigned to nonuniversal behavior of the exponent t, or to saturation of the elastic response. On the other hand, the presented model accounts for all the main experimental features observed in these systems and for previously reported data of elastomer composites. The simulated behavior of the piezoresistivity coefficient is also in qualitative agreement with previous reports.

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Section: Conduction Criterions and General Relationshipsmentioning

confidence: 99%

A model for the dependence of the electrical conductance with the applied stress in insulating-conducting composites

Negri

Rodríguez

Bernik

et al. 2010

Journal of Applied Physics

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“…Composite materials based on an electronically conducting polymer (ECP) matrix incorporating metal oxide nanoparticles constitute a fascinating class of functional materials, as shown by review articles [1]. They are potentially aimed at a vast range of applications among which one can cite protection against corrosion of iron [2], electrocatalysis [3], supercapacitors [4,5] or Li-ion batteries [6].…”

Section: Introductionmentioning

confidence: 99%

Influence of the Incorporation of CeO2 Nanoparticles on the Ion Exchange Behavior of Dodecylsulfate Doped Polypyrrole Films: Ac-Electrogravimetry Investigations

Benmouhoub

Agrisuelas

Benbrahim

et al. 2014

Electrochimica Acta

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Cerium oxide (CeO 2 ) nanoparticles (NPs) possessing defined size and crystallinity have been synthesised by a co-precipitation method. The effect of several parameters, such as the nature of the solvent and the calcination process, on the crystallite size was studied by XRD, TEM and BET methods. These CeO 2 nanoparticles were then incorporated in dodecylsulfate (DS) doped PPy films during their electrodeposition in potentiodynamic conditions in order to produce PPy-DS/CeO 2 NPs nanocomposite thin films on gold coated quartz crystals. Simultaneous EQCM experiments revealed successful incorporation of increasing amounts of cerium oxide nanoparticles in the polypyrrole matrix during each of the consecutive CV scans. This was confirmed using FEG-SEM and EDS microanalysis.The ion exchange phenomena occurring in the resulting nanocomposite materials were studied by ac-electrogravimetry in NaCl aqueous electrolyte. PPy-DS films appear to be mainly cation exchangers, independently from the incorporation of CeO 2 nanoparticles (NPs) even though chloride anions in smaller amounts, and free water molecules, are 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 2 simultaneously transferred at the film/electrolytic solution interface. This study also reveals that the kinetics of Cl  ion insertion occurring at the film/electrolyte interface upon oxidation is persistently slower in PPy-DS/CeO 2 NPs films than in PPy-DS films throughout the entire potential window of investigation. However, the relative concentration changes of Cl  ions in PPy-DS/CeO 2 NPs films is about two times greater than that occurring in pristine PPy-DS films. Such conclusion tends to demonstrate that CeO 2 NPs have the ability to modify the morphology of electrodeposited PPy-DS thin films as well as their subsequent permeability towards ions contained in the electrolytic solution, possibly via the perturbation of polymer chain interactions and organisation. *Revised Manuscript (including Abstract) Click here to view linked References

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“…In previous reports, [12][13][14][15][16][17][18][19] composites based on conductive polymers were synthesized by templating and coating coupled with polymerization. However, complex morphologies, such as phase-segregated sea-island structures on the submicrometer scale, are not easily obtained by typical methods.…”

Section: Introductionmentioning

confidence: 99%

Phase separation of composite materials through simultaneous polymerization and crystallization

2017

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Composite materials have attracted much interest because of the emergent properties originating from the components. A variety of methods have been studied to control the morphology of composites based on noncrystalline polymers and crystalline materials. However, it is not easy to control complex morphologies, such as segregated sea-island structures, on the submicrometer scale. Polymerization induces crystallization, because supersaturation, which is required for crystallization, is achieved by the consumption of the monomer. Here we report a phase-separation approach based on simultaneous polymerization and crystallization as a new method for the morphological control of composite materials. Segregated polymer and organic crystal domains are obtained by polymerization of an organic monomer solution accompanied by simultaneous crystallization. The phase separation induced the generation of composite materials consisting of a redox-active quinone crystal and conductive polymer with a segregated structure on the submicrometer scale. The segregated composite of 2,3-dichloro-1,4-naphthoquinone and polypyrrole showed enhanced charge-storage properties based on the smooth redox reaction. The present phase-separation approach can be applied to a variety of functional segregated composite materials consisting of crystalline and polymer materials.

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Composites of Intrinsically Conducting Polymers as Sensing Nanomaterials

Cited by 612 publications

References 207 publications

A model for the dependence of the electrical conductance with the applied stress in insulating-conducting composites

A model for the dependence of the electrical conductance with the applied stress in insulating-conducting composites

Influence of the Incorporation of CeO2 Nanoparticles on the Ion Exchange Behavior of Dodecylsulfate Doped Polypyrrole Films: Ac-Electrogravimetry Investigations

Phase separation of composite materials through simultaneous polymerization and crystallization

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