MXenes are ultrathin transition-metal carbides, nitrides or carbonitrides with structures only a few atoms thick. Their unusual combination of electrical conductivity, mechanical flexibility, chemical tunability and large accessible surface area has made them attractive for batteries, supercapacitors, electromagnetic interference shielding, sensors and a range of emerging electronic devices. Unlike many two-dimensional materials, MXenes can be dispersed in liquids and processed into films, coatings and composite structures. Their properties can also be adjusted through changes in composition and surface chemistry, giving researchers a broad platform for designing materials with specific functions.

Most MXenes are produced from layered ceramic precursors known as MAX phases. These compounds contain alternating layers of transition-metal atoms and “A-site” elements, typically aluminium or related elements. Chemical etching removes the A layers while preserving the more strongly bonded transition-metal carbide or nitride sheets. Once the weaker interstitial layers have been selectively extracted, the remaining structure can be separated into thin MXene flakes. The challenge is to remove the desired atoms without damaging the robust two-dimensional framework, a balance that has traditionally required aggressive chemicals, extended reaction times and multiple purification steps.

Conventional synthesis routes include hydrofluoric acid etching, Lewis-acid etching and molten-salt treatment. Hydrofluoric acid can efficiently attack MAX phases, but it is highly corrosive and poses serious risks during handling, storage and waste treatment. Lewis-acid and molten-salt methods can avoid some of those hazards, yet they often require elevated temperatures, lengthy processing or substantial energy input. These limitations become increasingly important as demand grows and laboratories seek to move MXene production from small-scale experiments to industrial manufacturing. A synthesis route that is both fast and controllable could therefore influence not only the cost of MXenes but also the safety and environmental footprint of the entire materials pipeline.

The new approach, described by Xu, Yang, Zhu and colleagues, uses flash Joule heating to deliver an intense electrical pulse to the precursor material. Flash Joule heating can raise a material to very high temperatures in a fraction of a second, then allow it to cool rapidly once the pulse ends. In the reported process, the heating step is integrated with sequential chlorination and fluorination reactions. Rather than relying on slow diffusion through a liquid etchant, the method uses carefully controlled reaction conditions to promote selective chemical conversion and removal of the interstitial atoms within the MAX structure. The result is a rapid transformation from a layered precursor into a layered MXene product.

The central scientific challenge is selectivity. The atoms targeted for removal must react readily enough to leave the structure, while the transition-metal carbide or nitride layers must remain intact. According to the study, the researchers controlled both thermodynamic and kinetic parameters to guide this process. Thermodynamics determines which chemical transformations are favorable under the reaction conditions, while kinetics governs how quickly those transformations proceed and which pathways dominate. By tuning factors such as the reaction environment and heating profile, the team was able to promote the removal of the MAX phase’s interstitial atoms without triggering extensive decomposition of the desired two-dimensional framework.

The researchers applied the strategy to nine distinct MAX phases, demonstrating that the method is not limited to a single composition. This breadth is important because different MXenes offer different combinations of conductivity, surface reactivity, mechanical behavior and electrochemical characteristics. Producing multiple compositions through one general platform could make it easier to match a material to a specific application, whether the goal is rapid ion storage, electromagnetic absorption or integration into a flexible electronic device. The resulting MXenes were reported to have high structural quality and excellent electrochemical performance, suggesting that the rapid processing did not sacrifice the functional properties that make the materials valuable.

To understand how the transformation occurs, the team combined computational simulations with high-resolution transmission electron microscopy. The simulations were used to examine the selective-etching mechanism and identify how the chemical environment favors the removal of the targeted atoms. Meanwhile, electron microscopy provided direct views of structural evolution at the atomic scale, following the precursor as it changed from a MAX phase into a MXene. Such observations are especially significant for a rapid reaction, because many intermediate structures may exist only briefly. Connecting predicted reaction pathways with experimentally observed atomic arrangements gives researchers a stronger basis for refining the process and extending it to additional precursor chemistries.

The reported 30-second synthesis time places the method among the fastest approaches proposed for producing complex two-dimensional materials. Speed alone, however, is not enough for a manufacturing technology: the process must also deliver consistent products, use manageable quantities of reagents and maintain performance across different compositions. The study’s results indicate that sequential flash Joule heating-chlorination and fluorination, referred to as the FJH-ClF strategy, can address several of these requirements at once. Its rapid electrical heating may reduce the energy associated with long furnace treatments, while the selective chemistry could reduce the need for highly hazardous liquid etchants and intensive downstream processing.

The development arrives as researchers and manufacturers search for scalable ways to produce MXenes in quantities suitable for practical technologies. MXenes have already shown promise in laboratory demonstrations involving electrochemical energy storage, conductive coatings and electromagnetic shielding, but translating those demonstrations into commercial products requires reliable control over composition, layer structure, surface terminations and defect density. The FJH-ClF method could provide a route to that control by coupling short reaction times with a chemistry that is adaptable to multiple MAX phases. Its potential impact will ultimately depend on further studies of long-term stability, waste streams, reactor design, process uniformity and the performance of materials produced at larger scales. Even so, the work offers a striking example of how extreme, precisely controlled heating can replace slower and more hazardous chemical processing. By converting a difficult etching problem into a rapid sequence of thermal and chemical events, the researchers have presented a potentially safer and more sustainable pathway for manufacturing the MXenes that may underpin future energy, shielding and electronic technologies.

Subject of Research: Rapid synthesis of MXenes using sequential flash Joule heating, chlorination and fluorination

Article Title: Flash Joule heating for rapid MXenes synthesis

Article References: Xu, S., Yang, K., Zhu, H. et al. Flash Joule heating for rapid MXenes synthesis. Nat. Synth (2026). https://doi.org/10.1038/s44160-026-01132-2

Image Credits: AI Generated

DOI: https://doi.org/10.1038/s44160-026-01132-2

Keywords: MXenes, flash Joule heating, FJH-ClF, MAX phases, chlorination, fluorination, two-dimensional materials, electrochemical energy storage, electromagnetic shielding, sustainable materials synthesis

The study, recently published in npj Flexible Electronics, exploits the exceptional electrical and mechanical characteristics of MXenes, a burgeoning family of two-dimensional transition metal carbides and nitrides. These materials have garnered immense interest due to their remarkable conductivity, tunable surface chemistry, and compatibility with solution-based processing techniques. By integrating MXenes into an all-printed antenna architecture, the researchers address the critical challenges of fabricating flexible, lightweight, and high-performance millimeter-wave components.

Central to this work is the manipulation of spoof surface plasmon polaritons—electromagnetic modes confined at the interface between a metallic structure and a dielectric, which mimic the behavior of surface plasmons at lower frequencies. By engineering SSPP modes on the printed MXene structures, the antenna achieves enhanced confinement and guidance of electromagnetic waves, enabling efficient endfire radiation across an exceptionally broad frequency bandwidth. This approach transforms the conventional paradigms of antenna design, transcending limitations imposed by traditional metallic materials and rigid substrates.

The fabrication process showcases the seamless compatibility of MXene inks with advanced printing techniques, allowing meticulous patterning of ultra-thin conductive layers on flexible substrates. This method not only ensures scalability and cost-effectiveness but also preserves the intrinsic properties of MXenes, crucial for sustaining high conductivity and mechanical robustness in flexible formats. The result is a highly conformable antenna that can be integrated into wearable devices, foldable electronics, and other emerging platforms demanding sophisticated wireless capabilities.

Electromagnetic characterization reveals that the antennas maintain stable gain and radiation patterns throughout the ultra-wideband spectrum spanning significant portions of the millimeter-wave range. Such performance is vital for accommodating the diverse spectrum allocations anticipated for next-generation wireless communication, including 5G and beyond, where bandwidth and signal quality are paramount. Moreover, the endfire radiation pattern, which directs energy along the antenna axis, enhances spatial efficiency and minimizes interference—a critical advantage in densely populated spectral environments.

Additionally, mechanical tests confirm that the MXene-printed antennas withstand substantial bending and flexing without noticeable degradation in electrical or radiative performance. This durability aligns with the growing demand for flexible electronics capable of enduring the dynamic mechanical stresses inherent in wearable and portable applications. The synergy between MXene’s intrinsic material properties and inkjet printing techniques emerges as a pivotal enabler of this robustness.

The research further delves into theoretical modeling, elucidating the interaction mechanisms between SSPP modes and the MXene conductor geometry. Electromagnetic simulations complement experimental data, offering insights into optimizing antenna parameters such as line width, spacing, and substrate characteristics to tailor performance metrics for specific wireless communication standards. Such comprehensive analysis paves the way for customized antenna solutions adaptable to a wide array of practical scenarios.

Of particular significance is that the MXene-based antennas operate at millimeter-wave frequencies, which historically pose fabrication and material challenges due to skin effect losses and surface roughness in conventional metals. MXenes exhibit low surface resistance and exceptionally smooth processed films, substantially mitigating these issues. This attribute translates to reduced insertion losses and enhanced overall antenna efficiency, marking a decisive advantage over competing technologies.

Furthermore, the use of all-MXene printing eliminates reliance on disparate metallic elements or complex multi-material assemblies, simplifying manufacturing pipelines and accelerating prototype iterations. This unified material approach fosters reproducibility and integration potential, crucial factors for commercial viability in rapidly evolving technology landscapes.

The study also contemplates the environmental and sustainability dimensions inherent in MXene printing. The aqueous-based ink formulations, combined with additive manufacturing, minimize solvent usage and material wastage compared to subtractive semiconductor or metal etching processes. This eco-friendly aspect aligns with global imperatives to reduce the environmental footprint of electronics fabrication.

In broader context, these findings suggest far-reaching implications beyond wireless communication. The high precision and flexibility exhibited by MXene-printed antennas could impact radar systems, imaging technologies, and even emerging terahertz devices. The adjustable nature of SSPP propagation also introduces possibilities for dynamic reconfiguration and smart antenna arrays, opening avenues for adaptive wireless networks.

Industry experts predict that such all-MXene-printed millimeter-wave antennas could become foundational components in future flexible communication devices, including smart textiles, implantable medical sensors, and augmented reality interfaces. By bridging the gap between material science innovation and practical antenna engineering, this work propels the frontier of high-frequency flexible electronics closer to mass adoption.

As wireless ecosystems strive to accommodate surging data demands and ubiquitous connectivity, integrating advanced materials like MXenes into device architectures signifies a transformative strategy. The confluence of nanomaterial science, nanofabrication, and electromagnetic engineering exemplified in this research heralds a new era of multifunctional, high-performance flexible devices.

The research team’s achievement underscores the importance of interdisciplinary collaboration, weaving together expertise in materials chemistry, electromagnetic theory, and device physics. Their ability to harness and tailor the properties of two-dimensional materials through controlled printing processes illustrates the potential for next-generation technologies born from fundamental scientific insights.

Looking ahead, ongoing efforts will focus on further refining MXene ink formulations, exploring hybrid composites, and expanding the operational frequency range. Implementing integrated systems with signal processing and power management components on flexible substrates is another promising direction. Each advancement will inch flexible millimeter-wave communication systems toward widespread real-world implementation.

In sum, this pioneering work on high-precision all-MXene-printed flexible ultra-wideband millimeter-wave endfire antennas represents a milestone in wireless communication technology. By exploiting the sophisticated physics of spoof surface plasmon polaritons within a versatile, scalable fabrication framework, the research opens pathways for the seamless integration of high-frequency antennas into next-generation flexible devices, heralding new possibilities for connectivity and electronic design innovation.

Subject of Research:
Flexible ultra-wideband millimeter-wave endfire antennas fabricated using all-MXene printing technology, leveraging spoof surface plasmon polaritons for enhanced wireless communication performance.

Article Title:
High-precision All-MXene-printed flexible ultra-wideband millimeter-wave endfire antennas based on spoof surface plasmon polaritons for wireless communication.

Article References:
Lin, F., Ni, H., Zhao, W. et al. High-precision All-MXene-printed flexible ultra-wideband millimeter-wave endfire antennas based on spoof surface plasmon polaritons for wireless communication. npj Flex Electron (2026). https://doi.org/10.1038/s41528-025-00521-5

Image Credits:
AI Generated