MXene 3D‐AJP: Three‐Dimensional Well‐Oriented Freeform Networks of 2D MXene Nanosheets via Aerosol‐Based 3D Printing

Why It Matters

Binder‑free 3D MXene printing delivers unprecedented capacitance, accelerating miniaturized power solutions for next‑generation microelectronics.

Key Takeaways

• Binder-free aerosol jet prints 3D MXene structures.
• Real-time ink thickening enables self-supporting geometries.
• MSCs achieve 375 mF cm⁻² areal capacitance.
• Energy density reaches 11.04 µWh cm⁻², surpassing prior methods.
• Technique scalable for on-chip energy storage.

Pulse Analysis

The rise of two‑dimensional nanomaterials such as MXene has transformed research into high‑performance electrodes, yet integrating atomically thin sheets into three‑dimensional devices has remained a bottleneck. Conventional additive manufacturing often relies on polymer binders or sacrificial supports that dilute the intrinsic conductivity of MXene. By leveraging aerosol jet printing—a nozzle‑based, high‑resolution deposition technique—researchers can direct evaporating aerosol droplets to deposit MXene layers that solidify in situ, eliminating the need for any additive and preserving the material’s native electrical properties.

Key to this advancement is a real‑time ink thickening mechanism that occurs as solvent evaporates during flight, causing the MXene suspension to increase viscosity precisely at the substrate interface. Combined with strong van der Waals forces between adjacent nanosheets, the process yields freestanding, well‑oriented 3D networks with micron‑scale precision. This binder‑free approach not only simplifies the manufacturing workflow but also enables the creation of high‑aspect‑ratio microarchitectures that were previously unattainable with standard lithography or inkjet printing.

When applied to microsupercapacitors, the printed MXene electrodes deliver an areal capacitance of 375 mF cm⁻² and an energy density of 11.04 µWh cm⁻²—metrics that outstrip existing high‑resolution patterning methods by a substantial margin. Such performance translates into faster charge‑discharge cycles and longer operational lifetimes for on‑chip power modules, positioning this technology as a catalyst for the next generation of autonomous sensors, wearable electronics, and edge‑computing devices. Future work will likely explore scaling the process for roll‑to‑roll production and integrating other 2D materials to broaden the functional portfolio of binder‑free 3D printed components.