Screen-Printed Few-Layer Graphene Platforms for Monitoring Switchable Spin-Crossover Phenomena at Room-Temperature

Molecular bistability arising from the spin crossover (SCO) phenomenon offers a versatile platform for functional devices, yet its technological deployment remains hampered by poor electrical integration, fragile processing routes, and operation often restricted to low temperatures. Two-dimensional (2D) materials, particularly graphene, have emerged as powerful transducers of spin-state switching, but most demonstrations rely on non-scalable fabrication methods and rigid substrates, limiting their practical relevance. Here, we report a semi-printable strategy that integrates the benchmark SCO compound Fe(pz)[Pt(CN)₄] with a screen-printed few-layer graphene platform on flexible Kapton substrates. The hybrid devices preserve the intrinsic spin transition near room temperature while enabling reproducible electrical readout through few-layer graphene conductance modulation. This approach combines molecular bistability, scalable fabrication, and flexible electronics, establishing a robust pathway toward next-generation spintronic, sensing, and multifunctional device platforms.