Beyond Graphene: MXenes – The Rising Stars of 2D Materials
The world of two-dimensional (2D) materials is rapidly expanding beyond graphene, with a new class of materials called MXenes gaining significant momentum. Researchers at Empa, the Swiss Federal Laboratories for Materials Science and Technology, are leading the charge in exploring the potential of these versatile materials for applications ranging from energy storage to medicine.
What are MXenes?
2D materials, consisting of a single layer of atoms, are attracting intense research interest due to their advantageous properties, including high electrical conductivity and mechanical robustness. Whereas graphene, a single layer of carbon atoms, is the most well-known example, MXenes are emerging as strong contenders. Unlike graphene, MXenes can be composed of transition metals combined with nitrogen or carbon.1
How are MXenes Made?
MXenes are produced from MAX phases – ceramic crystals with a layered structure, often described as resembling “lasagna.”1 The process involves etching out intermediate layers of these crystals using acid. The remaining layers, no longer chemically bonded, are then separated using ultrasonic agitation, resulting in MXenes ready for application.3
The TailorX Initiative at Empa
Recognizing the potential of MXenes, Empa launched the TailorX research booster in 2024, a two-year interdisciplinary project involving scientists from four different Empa laboratories: Functional Polymers, High-Performance Ceramics, Building Energy Materials and Components, and nanotech@surfaces.1 This collaborative approach allows researchers to cover the entire spectrum, from basic research and modeling to synthesis and application.1
Key Research Achievements
- MAX Phase Synthesis: Researchers have developed methods to synthesize a wide range of MAX phases with high purity.1
- AI-Powered Modeling: AI models have been developed to predict and understand the synthesis and geometry of MAX phases and MXenes.3
- Green Etching Process: A more environmentally friendly method for exfoliating MXenes from MAX phases has been developed, avoiding the use of hazardous hydrofluoric acid.1
Potential Applications of MXenes
MXenes exhibit a broad range of potential applications, including:
- Carbon Dioxide Capture: Their large surface area makes them promising candidates for capturing CO₂ from the air and converting it into usable raw materials.1
- Catalysis and Energy Storage: MXenes can be used in broader catalysis, energy storage, and sensor technology.
- Medical Applications: Certain MXenes show promise for antimicrobial effects and targeted cancer therapy.1
- Supercapacitors and Batteries: Research is underway to incorporate MXenes into high-performance supercapacitors and innovative batteries.
Looking Ahead
The conclusion of the TailorX Research Booster program marks the beginning of further exploration into the versatile applications of MXenes. Researchers are optimistic about their future, believing that the flexibility and adaptability of these 2D materials will lead to widespread adoption in various fields.1
Keep reading