Special Issue "Conducting Polymers for Advanced Applications"

A special issue of Polymers (ISSN 2073-4360). This special issue belongs to the section "Polymer Applications".

Deadline for manuscript submissions: 5 October 2020.

Special Issue Editor

Dr. Ana Maria de Matos Charas

Guest Editor
Organic Electronics Group, Instituto de Telecomunicações, Instituto Superior Técnico-Torre Norte, Av. Rovisco Pais,1, 1049-001 Lisboa-Portugal
Interests: organic conductors and semiconductors; electroluminescent materials; organic photovoltaic cells; organic field-effect transistors; self assembly, nanostructuring of organic polymers and small molecules
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Special Issue Information

Dear Colleagues,

Conducting polymers are today recognized as an important class of materials by both the academia and the industry owing to enabling the combination of the advantageous properties of conventional polymers (solubility, mechanical flexibility, low cost fabrication and processing, etc.) with conductivity levels that can compare well with those of semiconductors or even metals. Thanks to the possibility of fine-tuning the opto-electronic properties through controlling of doping levels and rational molecular design, an enormous number of applications can be envisaged and under diverse areas, from the biomedical (as actuators to artificial muscles, biosensors, etc.), to energy-related applications (as batteries, organic photovoltaic cells, photocatalysts for H2 production from water, and supercapacitors), to diverse devices for thin-film electronics (printed electronic devices, organic light-emitting diodes, sensors, organic field-effect transistors, electrochromic devices, etc.).
This Special Issue aims to report on progresses on the design and synthesis of conducting polymers, including semiconducting polymers, as well as advances on elucidating on polymer structure–properties, targeting, and/or demonstrating noteworthy advances in their most relevant applications. Both reviews and original research articles are welcome.

Dr. Ana Maria de Matos Charas
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Polymers is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Conjugated/semiconducting polymers
  • Conducting polymers
  • Molecular design of conducting polymers
  • Synthesis of conducting polymers
  • Structure–properties of conducting polymers
  • Polymer electronic devices

Published Papers (4 papers)

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Research

Open AccessFeature PaperArticle
Development of Poly(l-Lactic Acid)-Based Bending Actuators
Polymers 2020, 12(5), 1187; https://doi.org/10.3390/polym12051187 - 22 May 2020
Abstract
This work reports on the development of bending actuators based on poly(l-lactic acid) (PLLA)/ionic liquid (IL) blends, through the incorporation of 40% wt. of the 1-ethyl-methylimidazolium bis(trifluoromethylsulfonyl)imide ([Emim][TFSI]) IL. The films, obtained by solvent casting at room temperature and 50 °C, [...] Read more.
This work reports on the development of bending actuators based on poly(l-lactic acid) (PLLA)/ionic liquid (IL) blends, through the incorporation of 40% wt. of the 1-ethyl-methylimidazolium bis(trifluoromethylsulfonyl)imide ([Emim][TFSI]) IL. The films, obtained by solvent casting at room temperature and 50 °C, were subjected to several post-thermal treatments at 70, 90, 120 and 140 °C, in order to modify the crystallinity of the films. The influence of the drying temperature and of [Emim][TFSI] blending on the morphological, structural, mechanical and electrical properties of the composite materials were studied. The IL induced the formation of a porous surface independently of the processing conditions. Moreover, the [Emim][TFSI] dopant and the post-thermal treatments at 70 °C promoted an increase of the degree of crystallinity of the samples. No significant changes were observed in the degree of crystallinity and Young Modulus for samples with thermal treatment between 70 and 140 °C. The viability of the developed high ionic conductive blends for applications as soft actuators was evaluated. A maximum displacement of 1.7 mm was achieved with the PLLA/[Emim][TFSI] composite prepared at 50 °C and thermally treated at 140 °C, for an applied voltage of 10 Vpp, at a frequency of 100 mHz. This work highlights interesting avenues for the use of PLLA in the field of actuators. Full article
(This article belongs to the Special Issue Conducting Polymers for Advanced Applications)
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Open AccessArticle
Assessing the Influence of the Sourcing Voltage on Polyaniline Composites for Stress Sensing Applications
Polymers 2020, 12(5), 1164; https://doi.org/10.3390/polym12051164 - 19 May 2020
Abstract
Polyaniline (PANI) has recently gained great attention due to its outstanding electrical properties and ease of processability; these characteristics make it ideal for the manufacturing of polymer blends. In this study, the processing and piezoresistive characterization of polymer composites resulting from the blend [...] Read more.
Polyaniline (PANI) has recently gained great attention due to its outstanding electrical properties and ease of processability; these characteristics make it ideal for the manufacturing of polymer blends. In this study, the processing and piezoresistive characterization of polymer composites resulting from the blend of PANI with ultra-high molecular weight polyethylene (UHMWPE) in different weight percentages (wt %) is reported. The PANI/UHMWPE composites were uniformly homogenized by mechanical mixing and the pellets were manufactured by compression molding. A total of four pellets were manufactured, with PANI percentages of 20, 25, 30 and 35 wt %. Fourier-transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), differential thermal analysis (DTA), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) were used to confirm the effective distribution of PANI and UHMWPE particles in the pellets. A piezoresistive characterization was performed on the basis of compressive forces at different voltages; it was found that the error metrics of hysteresis and drift were influenced by the operating voltage. In general, larger voltages lowered the error metrics, but a reduction in sensor sensitivity came along with voltage increments. In an attempt to explain such a phenomenon, the authors developed a microscopic model for the piezoresistive response of PANI composites, aiming towards a broader usage of PANI composites in strain/stress sensing applications as an alternative to carbonaceous materials. Full article
(This article belongs to the Special Issue Conducting Polymers for Advanced Applications)
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Open AccessArticle
Triple Layer Tungsten Trioxide, Graphene, and Polyaniline Composite Films for Combined Energy Storage and Electrochromic Applications
Polymers 2020, 12(1), 49; https://doi.org/10.3390/polym12010049 - 30 Dec 2019
Cited by 2
Abstract
Different polyaniline (PANI)-based hybrid films were successfully prepared by electro-polymerizing aniline monomers onto pre-spin-coated indium tin oxide (ITO) glass slides with WO3, graphene, or WO3/graphene films. Comparing with pristine PANI, the shifts of the characteristic peaks of PANI-based nanocomposites [...] Read more.
Different polyaniline (PANI)-based hybrid films were successfully prepared by electro-polymerizing aniline monomers onto pre-spin-coated indium tin oxide (ITO) glass slides with WO3, graphene, or WO3/graphene films. Comparing with pristine PANI, the shifts of the characteristic peaks of PANI-based nanocomposites in UV-visible absorption spectra (UV-vis) and Fourier transform infrared spectroscopy (FT-IR) indicate the chemical interaction between the PANI matrix and the nanofillers, which is also confirmed by the scanning electron microscope (SEM) images. Corresponding coloration efficiencies were obtained for the WO3/PANI (40.42 cm2 C−1), graphene/PANI (78.64 cm2 C−1), and WO3/graphene/PANI (67.47 cm2 C−1) films, higher than that of the pristine PANI film (29.4 cm2 C−1), suggesting positive effects of the introduced nanofillers on the electrochromic performance. The areal capacitances of the films were observed to increase following the order as bare WO3 < WO3/graphene < pristine PANI < WO3/PANI < graphene/PANI < WO3/graphene/PANI films from both the cyclic voltammogram (CV) and galvanostatic charge-discharge (GCD) results. The enhanced energy storage and electrochromic performances of the PANI-based nanocomposite films can be attributed to the capacitance contributions of the introduced nanofillers, increased PANI amount, and the rougher morphology due to the embedment of the nanofillers into the PANI matrix. This extraordinary energy storage and electrochromic performances of the WO3/graphene/PANI film make it a promising candidate for combined electrochromic and energy storage applications. Full article
(This article belongs to the Special Issue Conducting Polymers for Advanced Applications)
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Open AccessArticle
Allylamine PECVD Modification of PDMS as Simple Method to Obtain Conductive Flexible Polypyrrole Thin Films
Polymers 2019, 11(12), 2108; https://doi.org/10.3390/polym11122108 - 15 Dec 2019
Abstract
In this paper, we report a one-step method to obtain conductive polypyrrole thin films on flexible substrates. To do this, substrates were modified through allylamine plasma grafting to create a high amount of reactive amine groups on PDMS surface. These groups are used [...] Read more.
In this paper, we report a one-step method to obtain conductive polypyrrole thin films on flexible substrates. To do this, substrates were modified through allylamine plasma grafting to create a high amount of reactive amine groups on PDMS surface. These groups are used during polypyrrole particle synthesis as anchoring points to immobilize the polymeric chains on the substrate during polymerization. Surface morphology of polypyrrole thin films are modified, tailoring the polyelectrolyte used in the polypyrrole synthesis obtaining different shapes of nanoparticles that conform to the film. Depending on the polyelectrolyte molecular weight, the shape of polypyrrole particles go from globular (500 nm diameter) to a more constructed and elongated shape. The films obtained with this methodology reflected great stability under simple bending as well as good conductivity values (between 2.2 ± 0.7 S/m to 5.6 ± 0.2 S/cm). Full article
(This article belongs to the Special Issue Conducting Polymers for Advanced Applications)
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Salvador Borros
Title: Allylamine PECVD modification of PDMS as simple method to obtain conductive flexible polypyrrole thin films.

Verónica Bermudez et.al.
Title:
Dielectric and electrical conductivity behavior of poly(vinylidene fluoride)/ionic liquid blends.

Hailong Lyu et.al.
Title: General Investigation of Hybrid WO3, Graphene, and PANI Films for Combined Energy Storage and Electrochromic Application
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