A printable superconducting nanosheet ink for fabricating flexible, hybrid electronic and quantum devices

Background

The field of printable and flexible electronics has rapidly expanded in recent years, driven by the demand for lightweight, adaptable, and cost-effective electronic devices that can be integrated into a variety of substrates, including plastics, textiles, and unconventional surfaces. This technological shift is particularly important for emerging applications such as wearable devices, flexible displays, and quantum computing hardware, where traditional rigid electronics are unsuitable. Superconducting materials, which enable zero-resistance current flow and are vital for quantum circuits and highly efficient interconnects, are especially sought after in this context. The ability to print superconducting circuits directly onto diverse substrates opens new possibilities for device miniaturization, rapid prototyping, and the integration of advanced functionalities into flexible platforms.

Despite significant progress, current approaches to printable superconducting inks face several critical limitations. Many existing inks, such as those based on NbSe2 or YBCO, suffer from poor air stability, requiring protective coatings or inert processing environments, which complicate manufacturing and limit device longevity. Additionally, some inks rely on environmentally hazardous solvents or elements like selenium, raising concerns about safety and sustainability. The superconducting transition temperatures (Tc) of available 2D materials are often low, and their critical currents are insufficient for demanding applications. Furthermore, most current inks lack the ability to create seamless interfaces between superconducting and semiconducting regions within a single printed pattern, restricting the complexity and integration of printed electronic circuits. These challenges highlight the need for a new class of printable superconducting materials that combine high performance, environmental stability, and compatibility with flexible and scalable fabrication methods.

Technology

This technology is a printable, surfactant-free ink composed of two-dimensional 1T’-tungsten disulfide (WS2) nanosheets, which are metallically conductive at room temperature and become superconducting below 7.3 K. The WS2 nanosheets are produced via chemical exfoliation from potassium-intercalated precursors, resulting in monolayers that can be suspended in water or organic solvents. This formulation allows the ink to be deposited onto a wide range of substrates, including polymers and silicon wafers, using standard printing or deposition techniques. The material is air-stable for at least 30 days and features a unique phase-tunable property: exposure to laser or electron-beam irradiation can locally convert the superconducting 1T’ phase into a semiconducting 2H phase, enabling the direct patterning of hybrid superconducting/semiconducting electronic interfaces. These characteristics make the ink suitable for fabricating superconducting circuits, qubits, and flexible electronics with high critical currents and robust environmental stability.

What differentiates this technology is its combination of air stability, environmental friendliness, and high superconducting performance, which addresses key limitations of prior superconducting inks. Unlike inks based on other 2D materials such as NbSe2, which are air-sensitive and require protective surfactants, this WS2 ink is stable in water and air without additives, and it uses sulfur instead of selenium, reducing environmental impact. The ink’s superconducting transition temperature is among the highest for printable 2D materials, and its critical current exceeds that of previously reported alternatives. Additionally, the ability to pattern both superconducting and semiconducting regions within a single printed layer via post-deposition irradiation is a unique feature, enabling the creation of complex, integrated electronic devices on flexible or conventional substrates. This combination of printability, tunable electronic properties, and environmental robustness positions the technology as a significant advancement for next-generation quantum, flexible, and integrated electronic applications.

Benefits

• Printable and flexible superconducting ink enabling scalable fabrication of electronic devices
• Air-stable for at least 30 days without surfactants, ensuring long-term environmental stability
• Metallic conductivity at room temperature and superconductivity below 7.3 K for advanced electronic applications
• Phase tunability via laser or electron-beam irradiation to create hybrid superconducting/semiconducting interfaces
• Compatible with diverse substrates including polymers, silicon wafers, glass, and flexible plastics
• Environmentally friendly formulation using water or organic solvents and sulfur-based nanosheets
• High critical current exceeding that of previously reported superconducting nanosheet inks
• Enables fabrication of superconducting circuits, qubits, and integrated quantum devices

Applications

• Printable superconducting quantum circuits
• Flexible superconducting interconnects
• Hybrid superconducting-semiconducting devices
• Superconducting qubit fabrication
• Air-stable flexible electronics

Additional info

This printable ink comprises surfactant-free, two-dimensional 1T’-tungsten disulfide nanosheets. It exhibits metallic conductivity at room temperature and transitions to a superconducting state below 7.3 K. The material is air-stable for thirty days and features phase-tunability; laser or electron-beam irradiation converts the superconducting phase into a semiconducting 2H phase. This enables the fabrication of integrated electronic interfaces, qubits, and flexible circuits on diverse substrates.