Editorial Feature

Conductive Polymer-based Sensors: An Overview

Conductive polymers have garnered interest for their electrical properties, thermal and chemical resilience, and cheap cost. They have distinct and customizable architectures due to surface preparation and deposition.

Conductive Polymer-based Sensors: An Overview

​​​​​​​Image Credit: Photobank.kiev.ua/Shutterstock.com

Conductive polymers are employed in many applications because they are easy to combine into composite materials.

This article describes the fundamental properties, applications, fabrication, and characterization of conductive polymer-based nanosensors, including the challenges and prospects of these novel sensors.

Conductive Polymer-based Sensors and their Properties

Conductive polymer-based sensors utilize conductive polymers as the sensing material. Conductive polymers are organic materials that can conduct electricity when doped with other substances, such as metals or acids.

One of the main advantages of conductive polymer-based sensors is their ability to detect a wide range of analytes, such as gases, vapors, and liquids. These sensors can be tailored to detect specific analytes by modifying the chemical structure of the conductive polymer or by adding functional groups to the polymer backbone.

Another advantage of conductive polymer-based sensors is their high sensitivity. Conductive polymers have a high surface area-to-volume ratio, which allows them to interact with analytes more effectively, leading to a high degree of sensitivity.

Unlike traditional sensors, which may require expensive and complex equipment to manufacture, conductive polymer-based sensors can be produced using low-cost and simple methods, such as inkjet printing or screen printing. Additionally, conductive polymers are lightweight and flexible, making them suitable for wearable devices.

Design and Fabrication of Conductive Polymer-based Sensors

The design and fabrication of conductive polymer-based sensors involve several important steps. The first step is selecting the appropriate conductive polymer for the specific sensing application.

Conductive polymers can be synthesized or purchased commercially, and their chemical structure can be modified to improve their sensing properties. The second step is designing the sensor architecture, which includes selecting the substrate, deposition method, and patterning technique.

The choice of substrate depends on the application requirements, such as flexibility, biocompatibility, or thermal stability. Deposition methods can include techniques such as spin coating, inkjet printing, or vapor deposition, while patterning techniques can consist of photolithography, laser ablation, or microcontact printing.

After the conductive polymer and sensor architecture have been selected, the conductive polymer is deposited onto the substrate using the chosen deposition method.

The conductive polymer is then patterned using the selected patterning technique to create the sensor structure. The final step is integrating the sensor into the sensing system, which includes the addition of electrodes and any necessary readout or data acquisition systems.

Applications of Conductive Polymer-based Sensors

Conductive polymers have various applications in sensing technologies due to their unique properties. One such application is gas and vapor sensing, as conductive polymers can detect a wide range of gases and vapors. This makes them suitable for use in gas-sensing applications, such as detecting hazardous gases in the environment or monitoring air quality.

Conductive polymers are also used in humidity sensors, where they can detect changes in humidity levels. These sensors have applications in agriculture, where they can be used to monitor soil moisture levels and help optimize irrigation practices.

Another application of conductive polymers is in biosensing, where they can detect biological molecules such as proteins or DNA. Biosensors based on conductive polymers are useful in medical diagnostics, environmental monitoring, and food safety testing.

Conductive polymers have also been used in pressure sensors, where they can detect changes in pressure. These sensors have applications in various industries, such as automotive, aerospace, and healthcare.

In addition, conductive polymers are used in touch and tactile sensors, commonly used in electronic devices. These sensors detect changes in pressure or touch, enabling various user interface features.

Commercial Examples of Conductive Polymer-based Sensors

Numerous companies are utilizing conductive polymer-based sensors to create pioneering products, and there exist several commercial instances of such sensors. A few examples of these companies are:

Heraeus Nexensos develops and manufactures a range of sensors, including conductive polymer sensors, for a variety of industries, including automotive, medical, and aerospace. Its conductive polymer sensors are used for pressure sensing, force sensing, and temperature sensing applications.

PolyIC GmbH & Co. KG is a German company that specializes in the development and production of printed electronics. One of their product lines is conductive polymer sensors, which they produce using a roll-to-roll printing process. These sensors can be used for a variety of applications, such as touch sensors, temperature sensors, and gas sensors.

Conductive Compounds Inc. specializes in the development of conductive polymer materials, including sensors. Its sensors can be used in a range of applications, from temperature sensing to strain sensing.

Conductive Polymer-based Sensors: Challenges and Future Perspectives

While conductive polymer-based sensors have many advantages, some challenges still need to be addressed. One of the major challenges is improving the sensitivity and selectivity of the sensors. Although conductive polymers are highly sensitive, they can also be affected by environmental factors such as temperature, humidity, and pH.

Another challenge in conductive polymer-based research is achieving consistent and reproducible results. The properties of conductive polymers can vary depending on the synthesis and fabrication process, leading to sensor performance variability. Researchers are developing standardized protocols for synthesis and fabrication to improve the reproducibility of conductive polymer-based sensors.

In addition to these challenges, there are several future perspectives in the field of conductive polymer-based research. One perspective is the development of new types of conductive polymers with improved sensing properties. This can involve modifying the chemical structure of existing conductive polymers or developing new polymers from scratch.

Another perspective is the integration of conductive polymer-based sensors into new applications and technologies. For example, conductive polymer-based sensors can be integrated into wearable devices, such as smart clothing or health monitoring devices. These sensors can provide continuous and real-time monitoring of various physiological and environmental parameters.

Finally, developing low-cost and scalable fabrication methods for conductive polymer-based sensors will enable their widespread use in various applications. Researchers are working on creating simple and low-cost fabrication methods that can be easily scaled up for mass production.

Continue reading: Using Polymer-Based Sensors: Applications and Features

References and Further Reading

Heraeus Nexensos. (2023). From About Heraeus Nexensos: Available at: https://www.heraeus.com/en/hne/company_sensors/about_heraeus_sensors/about_heraeus_nexensos.html

Kushwaha, C. S., Singh, P., Shukla, S. K., & Chehimi, M. M. (2022). Advances in conducting polymer nanocomposite based chemical sensors: An overview. Materials Science and Engineering: B. doi.org/10.1016/j.mseb.2022.115856

Pavel, I.-A., Lakard, S., & Lakard, B. (2022). Flexible Sensors Based on Conductive Polymers. Chemosensors. doi.org/10.3390/chemosensors10030097

Poly IC. (2023). From PolyIC: Custom Sensor Solutions: Available at: https://www.polyic.com/en/

SMTnet. (2023). Conductive Compounds, Inc. Available at: https://smtnet.com/company/index.cfm?fuseaction=view_company&company_id=54094

Disclaimer: The views expressed here are those of the author expressed in their private capacity and do not necessarily represent the views of AZoM.com Limited T/A AZoNetwork the owner and operator of this website. This disclaimer forms part of the Terms and conditions of use of this website.

Hussain Ahmed

Written by

Hussain Ahmed

Hussain graduated from Institute of Space Technology, Islamabad with Bachelors in Aerospace Engineering. During his studies, he worked on several research projects related to Aerospace Materials & Structures, Computational Fluid Dynamics, Nano-technology & Robotics. After graduating, he has been working as a freelance Aerospace Engineering consultant. He developed an interest in technical writing during sophomore year of his B.S degree and has wrote several research articles in different publications. During his free time, he enjoys writing poetry, watching movies and playing Football.

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