A flexible plasma-generating fabric for on-demand, chemical-free sterilization

Background

The field of antimicrobial textiles has gained significant attention due to the persistent threat of infectious diseases and the heightened awareness brought on by global health crises such as the COVID-19 pandemic. There is a critical need for materials that can continuously and autonomously reduce or eliminate microbial contamination, especially in high-touch environments like healthcare, public transportation, and personal protective equipment. Traditional methods for imparting antimicrobial properties to fabrics often involve the incorporation of chemical agents, heavy metals, or nanoparticles, which can pose environmental and health concerns, have limited durability, and may lose efficacy over time. As a result, the demand for innovative, safe, and effective self-disinfecting solutions that do not rely on consumable chemicals or hazardous substances has grown substantially.

Current approaches to fabric sterilization and disinfection suffer from several limitations. Chemical coatings and embedded nanoparticles may require activation by external stimuli such as sunlight, can degrade with repeated washing, and may not provide uniform or long-lasting protection. Additionally, advanced plasma-based sterilization technologies, while effective in laboratory settings, typically depend on bulky, rigid devices, vacuum chambers, or the use of supplementary chemical agents like hydrogen peroxide vapor. These constraints make them impractical for integration into flexible, wearable textiles or for on-demand, portable use. Consequently, there remains a significant gap in the availability of flexible, reusable fabrics that can autonomously generate effective sterilizing agents without the need for complex equipment, external chemicals, or compromising user safety.

Technology

The self-disinfecting plasma fabric is an advanced textile engineered with a mesh of insulated conductive fibers, each featuring a flexible conductive core (such as copper or carbon) surrounded by one or more dielectric layers. When connected to a portable, battery-powered high-voltage, high-frequency supply, the fabric generates cold plasma in the micrometer-sized air gaps between fibers. This plasma emits reactive oxygen and nitrogen species (ROS/RNS), UV radiation, electrons, and electric fields, which work together to inactivate bacteria, viruses, and other pathogens by damaging their cellular components. The fabric operates safely at temperatures between 22°C and 40°C, making it suitable for direct contact with skin or sensitive surfaces. Integrated sensors, switches, and processors allow for precise control and monitoring, ensuring optimal performance and user safety. The textile can be woven or layered in various configurations, and optional disposable covers can be added for extra protection.

What differentiates this technology is its ability to provide rapid, on-demand, chemical-free sterilization within a flexible, lightweight, and portable textile format. Unlike conventional antimicrobial fabrics that rely on embedded chemicals, nanoparticles, or sunlight activation—often with limited or temporary efficacy—this solution uses plasma generation to create a broad spectrum of microbe-inactivating agents directly within the fabric. Experimental results show over 99% bacterial reduction within 60 seconds and significant viral inactivation in minutes, with the ability to tune plasma output for specific pathogens by adjusting power settings. The device’s low power consumption, safe operating temperatures, and integrated control systems make it practical for a wide range of applications, including personal protective equipment, medical textiles, wound dressings, and reusable sanitizing surfaces. This approach overcomes the limitations of rigid, complex plasma devices and chemical-based solutions, offering a reusable, self-sterilizing fabric that is both effective and user-friendly.

Benefits

• Provides on-demand, chemical-free sterilization using cold atmospheric plasma generated within a flexible fabric.
• Effectively inactivates bacteria, viruses, fungi, and spores through reactive oxygen and nitrogen species, UV radiation, and electric fields.
• Operates safely at low currents (≤2 mA) and temperatures between 22°C and 40°C, suitable for direct human contact.
• Lightweight, flexible, and portable with a compact battery-operated power supply for easy integration into PPE, medical textiles, and other applications.
• Enables rapid disinfection, achieving over 99% bacterial reduction within 60 seconds and significant viral inactivation within minutes.
• Allows tunable plasma output by adjusting power settings to target specific pathogens effectively.
• Incorporates sensors and control systems for safe, automated operation and user feedback.
• Reusable and eliminates the need for chemical disinfectants or complex sterilization equipment.

Applications

• Self-sterilizing medical gowns
• Reusable antimicrobial wound dressings
• Disinfecting personal protective equipment (PPE)
• Portable sanitizing surface wipes
• Antimicrobial military uniforms

Additional info

This flexible textile comprises an interconnected mesh of insulated conductive fibers, each with a conductive core and dielectric layers. A portable high-voltage, high-frequency supply generates cold plasma in micrometre air gaps between fibers. This plasma produces reactive oxygen/nitrogen species, UV, and electric fields, inactivating bacteria and viruses. Operating safely at 22-40°C and low current, it provides on-demand, chemical-free sterilization for itself and contacted surfaces.