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Polymers
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Polymer Sensors: Preparation, Characterization and Applications
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Polymer Sensors: Preparation, Characterization and Applications

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

Deadline for manuscript submissions: closed (25 April 2024) | Viewed by 5583

Special Issue Editors

Dr. Sylwia Baluta

E-Mail Website
Guest Editor
Faculty of Chemistry, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland
Interests: biosensors; neurotransmitters; oxidoreductases; polymers; voltammetry
Prof. Dr. Maria I. Pilo

E-Mail Website
Co-Guest Editor
Department of Chemistry and Pharmacy, University of Sassari, I-07100 Sassari, Italy
Interests: electroanalysis; electrochemical sensors and biosensors; voltammetry; conducting polymers; substituted thiophenes; transition metal ions complexes; nitrogen ligands; polyphenolic compounds; photocatalysis; photoresponsive devices; analytical chemistry; validation of analytical methods; food chemistry and analysis
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue in Polymers on Semi-conductive polymers as bulding blocks in sensors design is devoted to the dissemination of high-quality original research articles or comprehensive reviews on cutting-edge developments in this interdisciplinary field. Due to the available, wide range of compounds and composites based on polymers, as well as the resulting variety of primary and secondary properties, after appropriate modifications, e.g. by changing the pH or introducing appropriate functional groups, polymer materials have become very useful for sensor applications. They are excellent materials for the immobilization of biomolecules, they can influence the transfer of electrons, which is important in the design and production of efficient biosensors. Semi-conductive polymers are an interesting variety of organic polymers, with the presence of a conjugated double bond system (π-conjugated polymers) and the possibility of an appropriate distribution of the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO). Due to their specific properties and characteristic structure, semi-conductive polymers facilitate the transport of electric charge, strengthen the generated signal and influence the catalytic activity of proteins immobilized on their surface in sensor devices. In addition, due to the possibility of modifying physicochemical and optoelectronic parameters, low cost and easy production, they are perfect grounds for the construction of multifunctional sensors.

Thus, an in-depth understanding of physical, biological, and digital cues is highly relevant to the performance and development of any polymer-based sensor or biosensor devices. Both original contributions and comprehensive reviews are welcome.

Dr. Sylwia Baluta
Prof. Dr. Maria I. Pilo
Guest Editors

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 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 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

  • polymer-based materials
  • structural modification
  • structural characterization
  • polymer synthesis
  • concept and creative design of polymer-based devices
  • electrochemical sensors and biosensors
  • design of biomimetic polymer-based devices
  • functional polymeric materials

Published Papers (4 papers)

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Research

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13 pages, 4205 KiB  
Article
Boosting the Piezoelectric Response and Interfacial Compatibility in Flexible Piezoelectric Composites via DET-Doping BT Nanoparticles
by Liming Liu, Hongjian Zhang, Shengyang Zhou, Changzhou Du, Ming Liu and Yong Zhang
Polymers 2024, 16(6), 743; https://doi.org/10.3390/polym16060743 - 08 Mar 2024
Viewed by 458
Abstract
With the advent of the Internet of Things, self-powered wearable sensors have become increasingly prevalent in our daily lives. The utilization of piezoelectric composites to harness and sense surrounding mechanical vibrations has been extensively investigated during the last decades. However, the poor interface [...] Read more.
With the advent of the Internet of Things, self-powered wearable sensors have become increasingly prevalent in our daily lives. The utilization of piezoelectric composites to harness and sense surrounding mechanical vibrations has been extensively investigated during the last decades. However, the poor interface compatibility between ceramics nanofillers and polymers matrix, as well as low piezoelectric performance, still serves as a critical challenge. In this work, we employed Di(dioctylpyrophosphato) ethylene titanate (DET) as the coupling agent for modifying barium titanate (BTO) nanofillers. Compared to the BTO/PVDF counterpart, the DET-BTO/PVDF nanofibers exhibit an augmented content of piezoelectric β phase (~85.7%) and significantly enhanced stress transfer capability. The piezoelectric coefficient (d33) is up to ~40 pC/N, which is the highest value among reported BTO/PVDF composites. The piezoelectric energy harvesters (PEHs) present benign durability and attain a high instantaneous power density of 276.7 nW/cm2 at a matched load of 120 MΩ. Furthermore, the PEHs could sense various human activities, with the sensitivity as high as 0.817 V/N ranging from 0.05–0.1 N. This work proposes a new strategy to boosting the piezoelectric performance of PVDF-based composites via DET-doping ceramics nanoparticles, and in turn show significantly improved energy harvesting and sensing capability. Full article
(This article belongs to the Special Issue Polymer Sensors: Preparation, Characterization and Applications)
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12 pages, 7827 KiB  
Article
Understanding the Effect of Deposition Technique on the Structure–Property Relationship of Polyaniline Thin Films Applied in Potentiometric pH Sensor
by Vinicius M. Fraga, Isabela T. Lovi, Luis M. G. Abegão and Hugo J. N. P. D. Mello
Polymers 2023, 15(16), 3450; https://doi.org/10.3390/polym15163450 - 18 Aug 2023
Cited by 1 | Viewed by 828
Abstract
The comprehension of potentiometric pH sensors with polymeric thin films for new and advanced applications is a constant technological need. The present study aimed to explore the relationship between the sensitivity and correlation coefficient of potentiometric pH sensors and the structure–property relationship of [...] Read more.
The comprehension of potentiometric pH sensors with polymeric thin films for new and advanced applications is a constant technological need. The present study aimed to explore the relationship between the sensitivity and correlation coefficient of potentiometric pH sensors and the structure–property relationship of polyaniline thin films. The effect of the deposition method on the sample’s properties was evaluated. Galvanostatically electrodeposited and spin-coated polyaniline thin films were used as the sensing stage. Samples were electrodeposited with a current density of 0.5 mA/cm2 for 300, 600, and 1200 s and were spin coated for 60 s with an angular velocity of 500, 1000, and 2000 rpm. The electrodeposited set of films presented higher average sensitivity, 73.4 ± 1.3 mV/pH, compared to the spin-coated set, 59.2 ± 2.5 mV/pH. The electrodeposited films presented higher sensitivity due to their morphology, characterized by a larger roughness and thickness compared to spin-coated ones, favoring the potentiometric response. Also, their oxidation state, evaluated with cyclic voltammetry and UV-VIS spectroscopy, corroborates their sensing performance. The understanding of the structure–property relationship of the polymeric films affecting the pH detection is discussed based on the characteristics of the deposition method used. Full article
(This article belongs to the Special Issue Polymer Sensors: Preparation, Characterization and Applications)
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11 pages, 3181 KiB  
Article
Iron-Coordinated L-Lysine–Based Nanozymes with High Peroxidase-like Activity for Sensitive Hydrogen Peroxide and Glucose Detection
by Xiuqing Hou, Ruoxue Wang, Huijuan Zhang, Meng Zhang, Xiongwei Qu and Xiuli Hu
Polymers 2023, 15(14), 3002; https://doi.org/10.3390/polym15143002 - 10 Jul 2023
Viewed by 963
Abstract
It is crucial to develop sensitive and accurate sensing strategies to detect H2O2 and glucose in biological systems. Herein, biocompatible iron-coordinated L-lysine–based hydrogen peroxide (H2O2)-mimetic enzymes (Lys-Fe-NPs) were prepared by precipitation polymerization in aqueous solution. The [...] Read more.
It is crucial to develop sensitive and accurate sensing strategies to detect H2O2 and glucose in biological systems. Herein, biocompatible iron-coordinated L-lysine–based hydrogen peroxide (H2O2)-mimetic enzymes (Lys-Fe-NPs) were prepared by precipitation polymerization in aqueous solution. The coordinated Fe2+ ion acted as centers of peroxidase-like enzymes of Lys-Fe-NPs, and the catalytic activity was evaluated via the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) by H2O2. Therefore, a sensitive colorimetric detection sensor for H2O2 was constructed with a linear range of 1 to 200 μM and a detection limit of 0.51 μM. The same method could also be applied to highly sensitive and selective detection of glucose, with a linear range of 0.5 to 150 μM and a detection limit of 0.32 μM. In addition, an agarose-based hydrogel biosensor colorimetric was successfully implemented for visual assessment and quantitative detection of glucose. The design provided a novel platform for constructing stable and nonprotein enzyme mimics with lysine and showed great potential applications in biorelevant assays. Full article
(This article belongs to the Special Issue Polymer Sensors: Preparation, Characterization and Applications)
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Review

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15 pages, 4702 KiB  
Review
A Study on Doping and Compound of Zinc Oxide Photocatalysts
by Tan Mao, Mengchen Liu, Liyuan Lin, Youliang Cheng and Changqing Fang
Polymers 2022, 14(21), 4484; https://doi.org/10.3390/polym14214484 - 23 Oct 2022
Cited by 12 | Viewed by 2480
Abstract
As an excellent semiconductor photocatalyst, zinc oxide is widely used in the field of photocatalysis and is regarded as one of the most reliable materials to solve environmental problems. However, because its band gap energy limits the absorption of visible light and reduces [...] Read more.
As an excellent semiconductor photocatalyst, zinc oxide is widely used in the field of photocatalysis and is regarded as one of the most reliable materials to solve environmental problems. However, because its band gap energy limits the absorption of visible light and reduces the efficiency of catalytic degradation, it needs to be doped with other substances or compounded with other substances and precious metal. This paper summarizes the research on this aspect at home and abroad in recent years, introduces the doping of transition metal ions by zinc oxide, the compounding of zinc oxide with precious metals or other semiconductors, and the prospect of further improving the catalytic efficiency of zno photocatalyst is also put forward. Full article
(This article belongs to the Special Issue Polymer Sensors: Preparation, Characterization and Applications)
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