Electroactive polyaniline films

Diaz, A. F.; Logan, J. A.

doi:10.1016/s0022-0728(80)80081-7

Cited by 853 publications

(266 citation statements)

References 6 publications

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“…The rings lose their aromaticity, containing now two double and four single bonds, i.e., acquiring a quinoid form, as previously proposed for POMA from experimental data [52]. The C−N bond length is reduced to 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 becomes resonant between a single and a double bond, as also evidenced by the calculated bond order.…”

Section: Structural Characteristics and Theoretical Model Descriptionsupporting

confidence: 63%

Properties improvement of poly(o-methoxyaniline) based supercapacitors: experimental and theoretical behaviour study of self-doping effect

Gonçalves

Christinelli

Trench

et al. 2017

Electrochimica Acta

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ABSTRACT:Conducting polymers (CP) are very versatile materials with important properties due to their unique structure, including redox behaviour upon electrochemical polarization. Supercapacitors are among the devices in which CP show a promising performance due to their large specific capacitance. However, the major drawback of these materials is their low durability, which is an inbuilt process caused by ion intercalation, a side effect of the redox process. A viable strategy to increase CP stability is, therefore, the inhibition of the ion intercalation/de-intercalation process. Several strategies have been proposed to minimize this effect, among them self-doping. Self-doping makes the redox process mass-transport independent, decreasing the response time and increasing durability. With this purpose, this work have described the synthesis of layer-by-layer films (LBL) of poly(omethoxyaniline)/poly(3-thiopheneacetic acid) (POMA/PTAA) and contributes to understand how the redox process leads to premature aging, and how self-doping minimizes this problem. The main techniques of characterisation used were electrochemical impedance spectroscopy (EIS) experiments and density functional theory (DFT) calculations. EIS provides important information about the electrochemical behaviour, while DFT calculations allowed to characterize, at the molecular level, the changes in the material structure. The association of both techniques helped to understand how self-doping improves the POMA properties. DFT calculations showed that in the layer-by-layer (LBL) films, the twisting of the polymer chain due to the oxidation is 12% less while the chain shortening is 5% compared with films prepared POMA by casting. The EIS data showed the effect of these molecular changes in the structure; the swelling of the LBL films is 50% less than cast ones. These observations are important because the PTAA layer acts beyond a chargecompensator, working as a backbone structure that mechanically stabilize the POMA layer, leading to an increase in the durability, and improving the electrochemical properties.

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Section: Structural Characteristics and Theoretical Model Descriptionsupporting

confidence: 63%

Properties improvement of poly(o-methoxyaniline) based supercapacitors: experimental and theoretical behaviour study of self-doping effect

Gonçalves

Christinelli

Trench

et al. 2017

Electrochimica Acta

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“…Polyaniline films are polyelectrochromic (yellow-green-dark blue-black), 124 the yellowgreen transition being durable to repetitive color switching even though the leucomeraldine form is not fully conjugated. 125 Several redox mechanisms involving protonationdeprotonation and/or anion ingress/egress have been proposed, [126][127][128] with Figure 12 giving the composition of the various redox states.…”

Section: Polyanilines As Electrochromic Materialsmentioning

confidence: 99%

Electrochromic organic and polymeric materials for display applications

2006

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An electrochromic material is one where a reversible color change takes place upon reduction (gain of electrons) or oxidation (loss of electrons), on passage of electrical current after the application of an appropriate electrode potential. In this review the general field of electrochromism is introduced, with coverage of the types, applications, and chemical classes of electrochromic materials and the experimental methods that are used in their study. The main classes of electrochromic organic and polymeric materials are then surveyed, with descriptions of representative examples based on transition metal coordination complexes, viologen systems, and conducting polymers. Examples of the application of such organic and polymeric electrochromic materials in electrochromic displays are given.

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“…Polyaniline, discovered in 1982 by Letheby 10 , is one of the most studied conducting polymers and has been used in many applications due to their environmental stability, low cost of fabrication, and unusual electrical and optical properties [11][12][13][14][15] . In addition, polyaniline exhibits electrochromic effects, from pale yellow to green to blue-velvet [16][17][18] . However, the main disadvantages of polyaniline are its insolubility in common organic solvents and its infusibility 19 .…”

Section: Introductionmentioning

confidence: 99%