Open research questions in Conducting polymers and applications

What the literature leaves open

• The paper identifies a need for understanding the photoresponse and humidity response of PPy/TiO2 heterostructures. There is a gap in knowledge regarding the synergistic effects of light and humidity on these materials.

  Synergistic Enhancement of Photoresponse and Humidity Response in PPy/TiO2 Heterostructures · 2026 · DOI

• Conventional glass-electrode pH meters have limitations such as photochemical degradation and incomplete reversibility. There is a need for a mechanically stable sensing film that can deliver spatially uniform and repeatable optical responses upon acid-base switching.

  Sheet-assembled polyaniline-functionalized graphene oxide composite films for pH-responsive visual sensing · 2026 · DOI

• The paper identifies a gap in the current protection methods for wind turbine blades, which cannot cover the full blade area. It also highlights the lack of understanding of the effect of different diisocyanate hard segments on charge transfer efficiency in polyaniline-grafted polyurethane copolymers.

  First-Principles Research on Hard Segment Regulation of Field-Induced Charge Transfer in Polyaniline-Grafted Polyurethane Copolymers · 2026 · DOI

• The need for sensitive and selective detection of biomarkers in complex biological samples. The challenge of distinguishing between similar substances, such as dopamine and other biomarkers. The need for multiplexed analysis with core pathological indicators, such as α-synuclein, to enhance diagnostic specificity.

  Biosensors for Early Detection of Parkinson’s Disease: Principles, Applications, and Future Prospects · 2025 · DOI

• The paper identifies the need for sensitive and selective electrochemical sensors for detecting pollutants in the environment and food. It also highlights the limitations of traditional methodologies for detecting heavy metal ions and other pollutants. The gap appears to be the lack of efficient and effective sensors for environmental monitoring and food safety.

  Melanin-Related Materials in Electrochemical Sensors for Monitoring the Environment and Food · 2025 · DOI

• The lack of electrodes that match the softness of implanted tissues. The need for new materials that can be used for sensing and stimulation in bioelectronic medicines. The limited biocompatibility and conductivity of current electrode materials.

  Polypyrrole Coatings as Possible Solutions for Sensing and Stimulation in Bioelectronic Medicines · 2025 · DOI

• It highlights the need to study the effect of tungsten content on the electrical properties. The research gap is related to the lack of understanding of the relation between the degree of compression and electrical properties.

  Electrical Properties of Semiconductor/Conductor Composites: Polypyrrole-Coated Tungsten Microparticles · 2025 · DOI

• Lack of understanding of the properties and behavior of nickel ferrite/carbon nanotubes-polyaniline nanocomposites. Limited research on the application of magnetic nanoparticles in nanocomposites.

  Magnetoresistive Polyaniline Nanocomposites Incorporating Nickel Ferrite-Modified Carbon Nanotubes · 2025 · DOI

• Another challenge is the need to develop conductive polymers-based electrochemical sensors that are highly sensitive and selective. The paper also highlights the challenge of commercializing electrochemical sensors.

  Recent Advances in Conductive Polymers-Based Electrochemical Sensors for Biomedical and Environmental Applications · 2024 · DOI

• The forms of commercialization of electrochemical sensors are significantly lower compared to the number of research studies. There is a need to enhance the detection performance of electrochemical sensors for biomedical and environmental applications.

  Recent Advances in Conductive Polymers-Based Electrochemical Sensors for Biomedical and Environmental Applications · 2024 · DOI

• However, the biological properties of polyazulene have not been reported to date.

  Is polyazulene cytocompatible? The synthesis method matters · 2026 · DOI

• However, in contrast to the well‐studied PEDOT:poly(styrenesulfonate) (PSS) system, the nanoscale morphology and the relationship between crystallinity and composition in PEDOT/Nafion remain insufficiently explored and therefore poorly understood.

  Morphology and Structure of PEDOT:Nafion: Insights from Experiment and Molecular Dynamics Simulations · 2026 · DOI

• However, the rational molecular design principles governing the simultaneous optimization of both functions remain insufficiently understood.

  Furan, Selenophene, and Thiophene‐Bridged Triphenylamine Polymer Films: A Systematic Chalcogen Study of Bifunctional Electrochromic Supercapacitor Electrodes · 2026 · DOI

• But observe that the in vitro findings are promising, and further work is required to evaluate: Long-term cyclic physiological loading mechanical degradation and chemical stability, Biological responses including inflammation, fibrosis, and osteointegration in vivo, Clinical-scale up of the coating process to device-grade.

  Bioactive Polymeric Nanocoatings Based on 4-Nicotinamido-4-Oxo-2-Butenoic Acid for Enhanced Corrosion Resistance and Biocompatibility of Implantable 316 L Stainless Steel · 2026 · DOI

• Although further characterization of mechanical robustness and electrochemical investigations are required, the present work addresses an important and previously underexplored practical bottleneck in BPV electrode integration.

  Electrical interface design for additively manufactured polymer anodes for biophotovoltaic systems · 2026 · DOI

• There is a need for biocompatible electrodes with high flexibility and stretchability. Current electrodes have limitations in terms of biocompatibility and durability.

  Nanofiber-based self-adhesive electrode using self-doped PEDOT and polyurethane · 2026 · DOI

• We find that the obtained resolution is not limited by the optics but is related to material aspects such as molecular diffusion, providing guidelines for further optimizations.

  High‐Resolution Maskless UV Patterning of Vapor Phase Polymerized Conducting Polymer · 2025 · DOI

• The study does not provide a comprehensive comparison with other electrodes. The cytotoxicity evaluation was limited to colony formation assays with V79 cells.

  Nanofiber-based self-adhesive electrode using self-doped PEDOT and polyurethane · 2026 · DOI

• Further investigation into the development of highly effective semiconductor photocatalysts, - Exploration of the potential applications of the PPy/TiO2…

  Synergistic Enhancement of Photoresponse and Humidity Response in PPy/TiO2 Heterostructures · 2026 · DOI

• Further research could investigate the dynamic effects of the field on the charge transfer, - The study of other diisocyanate hard segments could provide more…

  First-Principles Research on Hard Segment Regulation of Field-Induced Charge Transfer in Polyaniline-Grafted Polyurethane Copolymers · 2026 · DOI

• Advancing biosensors for early PD diagnosis. Exploring the challenges and prospects of biosensors for PD detection. Developing more sensitive and specific biosensors for PD biomarkers.

  Biosensors for Early Detection of Parkinson’s Disease: Principles, Applications, and Future Prospects · 2025 · DOI

• Formulas 4 and 5 could not be cast into films due to brittleness and cracking, - Flory-Rehner equation assumes ideal behavior, - Limited to 10 formulations of bio-chitosan composite…

  Influence of Titanium Dioxide (TiO2) Nanocrystallinity on the Optoelectrical Properties of Chitosan Biocomposite Films Prepared via Sol–Gel Casting · 2025 · DOI

• Investigation of other nanoparticle concentrations and types, - Study of long-term stability and durability of bio-nanocomposite films, - Exploration of applications in electroactive actuators and biomedical…

  Influence of Titanium Dioxide (TiO2) Nanocrystallinity on the Optoelectrical Properties of Chitosan Biocomposite Films Prepared via Sol–Gel Casting · 2025 · DOI

• Investigating the properties of composites with different tungsten contents. Studying the effect of polypyrrole coating on the mechanical properties of tungsten microparticles.

  Electrical Properties of Semiconductor/Conductor Composites: Polypyrrole-Coated Tungsten Microparticles · 2025 · DOI

• Further investigation of the properties and applications of PANI-MnO2 composites. The development of new electrode materials with improved performance. The evaluation of the scalability and commercial viability of PANI-MnO2 composites.

  Structural, electrical, and electrochemical properties of polyaniline- manganese dioxide (PANI-MnO2) composites · 2026 · DOI

Most-cited papers in Conducting polymers and applications

• Electroluminescence in conjugated polymers · Nature · 1999 · 5,626 citations
• Two-dimensional charge transport in self-organized, high-mobility conjugated polymers · Nature · 1999 · 4,354 citations
• A high-mobility electron-transporting polymer for printed transistors · Nature · 2009 · 2,892 citations
• Integrated Optoelectronic Devices Based on Conjugated Polymers · Science · 1998 · 2,546 citations
• Conducting polymers: a comprehensive review on recent advances in synthesis, properties and applications · RSC Advances · 2021 · 1,317 citations
• 3D printing of conducting polymers · Nature Communications · 2020 · 1,008 citations
• Preparations, Properties, and Applications of Polyaniline and Polyaniline Thin Films—A Review · Polymers · 2021 · 636 citations
• The journey of conducting polymers from discovery to application · Nature Materials · 2020 · 492 citations
• The damaging effects of the acidity in PEDOT:PSS on semiconductor device performance and solutions based on non-acidic alternatives · Materials Horizons · 2020 · 449 citations
• Vertical organic electrochemical transistors for complementary circuits · Nature · 2023 · 417 citations

Most recent work

• Conducting Polymers for Electrochemical Sensing: From Materials and Metrology to Intelligent and Sustainable Biointerfaces · Sensors · 2026
• Alcohol-dispersed conductive polymer for high-performance organic photovoltaic cells · Joule · 2026
• Density Functional Theory Insights into Polypyrrole-Based Functional Composites for Advanced Energy Storage, Sensing, and Environmental Applications · Nanomaterials · 2026
• Integrated Design of Conductive and Dielectric Polymers: Advancing Flexible Electronics from Materials Innovation to Applications · Macromolecular Rapid Communications · 2026
• Broadly applicable hydrophilic additive enhances electrochemical transistor function · Proceedings of the National Academy of Sciences · 2026
• Spontaneously Spreading a Conjugated Polymer Film to Construct a Multifunctional Electrochromic Device with Tunable Color · ACS Applied Polymer Materials · 2026
• Blood-catalyzed n-doped polymers for reversible optical neural control · Science · 2026
• Engineering conductive cotton/polyester fabrics with PANI@MWCNT-NiS for humidity-sensitive smart applications · Diamond and Related Materials · 2026
• Electrochemical QCM-D for insights into organic mixed ionic–electronic conductors and transistors (OECTs) · Materials Chemistry Frontiers · 2026
• Morphological Changes in PEDOT:PSS under Electrolytes, Dopamine, and PEG-400 Exposure: A Molecular Simulation Perspective · Macromolecules · 2026

Related topics in Materials Science