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Insights into properties, synthesis and emerging applications of polypyrrole-based composites, and future prospective: A review
Open accessAbstract
Recent advancements in polymer science and engineering underscore the importance of creating sophisticated soft materials characterized by well-defined structures and adaptable properties to meet the demands of emerging applications. The primary objective of polymeric composite technology is to enhance the functional utility of materials for high-end purposes. Both the inherent qualities of the materials and the intricacies of the synthesis process play pivotal roles in advancing their properties and expanding their potential applications. Polypyrrole (PPy)-based composites, owing to their distinctive properties, hold great appeal for a variety of applications. Despite the limitations of PPy in its pure form, these constraints can be effectively overcome through hybridization with other materials. This comprehensive review thoroughly explores the existing literature on PPy and PPy-based composites, providing in-depth insights into their synthesis, properties, and applications. Special attention is given to the advantages of intrinsically conducting polymers (ICPs) and PPy in comparison to other ICPs. The impact of doping anions, additives, and oxidants on the properties of PPy is also thoroughly examined. By delving into these aspects, this overview aims to inspire researchers to delve into the realm of PPy-based composites, encouraging them to explore new avenues for flexible technology applications.
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![Fig. 1 Mechanism of Electropolymerization of pyrrole [38].](/paper-figures/a2653c40ce1c4bd580ef2e2db500fdc4/insights-into-properties-synthesis-and-emerging-applications-of-polypyrrole-figure-1.jpg)

![Fig. 3 (a) I–V plots of PPy-FP, PTSA-PPy-FP, CSA-PPy-FP, and HCl-PPy-FP. (b) Possible conductivity range of insulator to metallic conductor [97].](/paper-figures/9eb07d3c6ace44fdb95ae9acf4cc3dd6/insights-into-properties-synthesis-and-emerging-applications-of-polypyrrole-figure-3.jpg)
![Fig. 4 SEM images of the surface of (a) raw cotton and (b–g) PPy/cotton composites with different Py/FeCl3 ratios [119].](/paper-figures/891703b8cb6248c8ae241f967805d0a3/insights-into-properties-synthesis-and-emerging-applications-of-polypyrrole-figure-4.jpg)

![Fig. 6 (a) Schematic illustration of 3-D nanostructure of GNP/MWCNT/PPy and interactions between GNPs, MWCNTs and PPy (b) Shielding mechanism of GNP/MWCNT/PPy/PU nanohybrid (c) Results of GNP/MWCNT/PPy/PU with different PPy contents [126].](/paper-figures/a6e31247161f47829d0df4f50ef10a78/insights-into-properties-synthesis-and-emerging-applications-of-polypyrrole-figure-6.jpg)



![Fig. 10 (a) SEM images of PPy microspheres and core shell PPy@ PANI composites with different PANI content: PPy@PANI-0.4 (b), PPy@PANI-0.8 (c), PPy@PANI-1.2 (d), PPy@PANI-1.6 €, and PPy@PANI-2.0 (f). Schematic illustration of preparing core shell PPy@PANI composites (g), RL curves of PPy@PANI at some different matching thicknesses (h) [147].](/paper-figures/df03ce4633b74c35ba368918ea229b49/insights-into-properties-synthesis-and-emerging-applications-of-polypyrrole-figure-10.jpg)
![Fig. 11 The synthesis process ofPPy–treated fabrics is by ultrasound deposition to eradicate the bacteria [226].](/paper-figures/67e9bad0c403414fb05aebd3ace31d62/insights-into-properties-synthesis-and-emerging-applications-of-polypyrrole-figure-11.jpg)
![Fig. 12 Selectivity of PPy sensor [250].](/paper-figures/698b2f1e93164e779e07870fea70d440/insights-into-properties-synthesis-and-emerging-applications-of-polypyrrole-figure-12.jpg)
![Fig. 13 The response curves of (a) neat PPy polymer matrix, 3 wt% PPy/GNR, and 3 wt% PPy/SnO2/GNR nanocomposites with exposure of various concentrations of NH3 at room temperature. The sensing repeatability and reversibility of the 3 wt% PPy/SnO2/GNR sensor with exposure of (b) 1 ppm and (c) 2 ppm NH3 at room temperature [257].](/paper-figures/6e3d43814ada4ea5ab09e2ca2b5305e1/insights-into-properties-synthesis-and-emerging-applications-of-polypyrrole-figure-13.jpg)
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“The hydrogen sensing mechanism on the surface of PANi in its emeraldine (EM) form proceeds through hydrogen adsorption and hydroxide ion desorption.”
From Dual-function aerogel electrocatalyst enabling efficient hydrogen production and ambient-temperature hydrogen detection (2026) · cites this paper as [52]
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Metadata
- Authors
- Sood, Y., Singh, K., Mudila, H., Lokhande, P. E., Singh, L., Kumar, D., Kumar, A., Mubarak, N. M., & Dehghani, M. H.
- Affiliations
- Lovely Professional University (IN)
- Metropolitan University of Technology (CL)
- Sardar Patel University Mandi (IN)
- Universiti Teknologi Brunei (BN)
- Center for Solid Waste Research (IR)
- Corresponding author
- Kumar, Anil
- Mubarak, Nabisab Mujawar
- Dehghani, Mohammad Hadi
- ORCID
- Venue
- Heliyon
- Publisher
- Elsevier BV
- Published
- 2024-07
- Volume
- 10
- Issue
- 13
- Pages
- e33643
- ISSN
- 2405-8440 (ISSN-L)
- PMC
- PMC11255519
- OpenAlex
- W4400080199
- Cited by
- 106
- References
- 271
- Citations by year
- 2026: 60 · 2025: 40 · 2024: 6
- FWCI
- 2.40
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Heliyon (publishedVersion, cc-by-nc)
- PubMed Central (publishedVersion, cc-by-nc)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Topics
- Physical Sciences › Materials Science › Polymers and Plastics › Conducting polymers and applications
- Physical Sciences › Materials Science › Electronic, Optical and Magnetic Materials › Dielectric materials and actuators
- Physical Sciences › Materials Science › Polymers and Plastics › Polymer Nanocomposite Synthesis and Irradiation
- Keywords
- polypyrrole, conducting polymers, polymer composites, anion doping, oxidant effects, additives, polymer synthesis, polymer properties, flexible electronics, hybrid materials
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