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Conjugated Polymers: Synthesis, Processing and Applications

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

Deadline for manuscript submissions: closed (30 November 2025) | Viewed by 703

Special Issue Editor

Instituto de Telecomunicações, Instituto Superior Técnico, Av. Rovisco Pais, P-1049-001 Lisboa, Portugal
Interests: conjugated polymers; organic electronics; conducting polymers; nanopatterning; energy materials
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue focuses on conjugated/semiconducting polymers, their processing techniques, properties, and wide-ranging applications. Conjugated polymers, with their unique ability to combine the properties of organic compounds with electrical conductivity, have been a topic of intensive research due to their potential in electronics, energy storage, sensors, and biomedical applications.

This Special Issue aims to bring together the latest advancements in the synthesis, characterization, processing, and applications of conjugated polymers, either as semiconductors or as materials with high conductivity, emphasizing innovative approaches that push the boundaries of this fascinating class of materials. Topics of interest include, but are not limited to, the (a) synthesis and modification of conjugated polymers: innovative methods for polymerization, copolymerization, and chemical modification of conducting polymers to tailor electrical, optical, and mechanical properties; (b) processing techniques: advanced processing methods for conducting polymers, including but not limited to solution casting, electrospinning, 3D printing, and thin-film deposition techniques, and their impact on performance; (c) structure–property relationships: investigations into how molecular structure, morphology, and microstructure influence conductivity, mechanical strength, and stability; (d) nanostructured conducting polymers: the development and characterization of nanocomposites, nanofibers, and other nanostructured conducting polymers for enhanced functionalities; (e) applications, such as energy storage (batteries, and fuel cells); flexible electronics (advances in stretchable, bendable, or wearable electronics); sensing (for chemical, biological, or environmental monitoring.); biomedical applications (in tissue engineering, drug delivery, neural interfaces, and bioelectronics); (f) contributions addressing sustainability and scalability focused on the eco-friendly synthesis and large-scale production, addressing environmental and economic concerns.

Dr. Ana 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 submissions that pass pre-check are 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 250 words) can be sent to the Editorial Office for assessment.

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 semimonthly 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 2700 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 polymers
  • electrical conductivity
  • synthesis and modifications of conjugated polymers
  • polymer electronic devices
  • flexible electronics

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Published Papers (1 paper)

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Research

13 pages, 1910 KB  
Article
High-Resolution Photolithographic Patterning of Conjugated Polymers via Reversible Molecular Doping
by Yeongjin Kim, Seongrok Kim, Songyeon Han, Yerin Sung, Yeonhae Ryu, Yuri Kim and Hyun Ho Choi
Polymers 2025, 17(24), 3341; https://doi.org/10.3390/polym17243341 - 18 Dec 2025
Viewed by 172
Abstract
Organic field-effect transistors (OFETs) require reliable micro- and nanoscale patterning of semiconducting layers, yet conjugated polymers have long been considered incompatible with photolithography due to dissolution and chemical damage from photoresist solvents. Here, we present a photolithography-compatible strategy based on doping-induced solubility conversion [...] Read more.
Organic field-effect transistors (OFETs) require reliable micro- and nanoscale patterning of semiconducting layers, yet conjugated polymers have long been considered incompatible with photolithography due to dissolution and chemical damage from photoresist solvents. Here, we present a photolithography-compatible strategy based on doping-induced solubility conversion (DISC), demonstrated using poly[2,5-bis(3-tetradecylthiophen-2-yl)thieno[3,2-b]thiophene] (PBTTT). AuCl3 doping reversibly modulates the benzoid/quinoid resonance balance, lamellar stacking, and π–π interactions, suppressing solubility during lithographic exposure, while dedoping restores the intrinsic electronic properties. Using this approach, micropatterns with linewidths as small as 2 µm were fabricated in diverse geometries—including line arrays, concentric rings, dot arrays, and curved channels—with high fidelity; quantitative analysis of dot arrays yielded mean absolute errors of 48–66 nm and coefficients of variation of 2.0–3.9%, confirming resolution and reproducibility across large areas. Importantly, OFETs based on patterned PBTTT exhibited charge-carrier mobility, threshold voltage, and on/off ratios comparable to spin-coated devices, despite undergoing multiple photolithography steps, indicating preservation of transport characteristics. Furthermore, the same DISC-assisted lithography was successfully applied to other representative p-type conjugated polymers, including P3HT and PDPP-4T, confirming the universality of the method. This scalable strategy thus combines the precision of established lithography with the functional advantages of organic semiconductors, providing a robust platform for high-density organic electronic integration in flexible circuits, biointerfaces, and active-matrix systems. Full article
(This article belongs to the Special Issue Conjugated Polymers: Synthesis, Processing and Applications)
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