Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.252
Publication date: 16th December 2024
Hybrid organic-inorganic perovskites (PVKs) have attracted large interest due to their chemical variability, structural diversity and favourable physical properties [1].
In this work, a new thermochromic composite based on 2D PVKs is presented. Our material is able to switch reversibly from a transparent state (transmittance > 80%) at room temperature to a coloured state (transmittance < 10%) at high temperatures. The process occurs very quickly, requiring only a few seconds for the transition between the bleached and coloured states, and vice versa. Analyses conducted by X-ray diffraction, Fourier-transform infrared spectroscopy, differential scanning calorimetry, rheological and optical measurements during heating and cooling cycles showed that the thermochromic phenomena is based on a reversible disassembly/assembly of PVKs, mediated by polymer chains intercalation. This mechanism occurs through the formation and breaking of hydrogen bonds between the polymer and perovskite [2].
By varying the type and concentration of the organic cations in the formulation, we can regulate the interaction between polymer and perovskite, modulating the switching temperature and kinetics.
This work demonstrates a novel potential of perovskite-based composite, paving the way for their applications in thermoresponsive devices.
The author gratefully acknowledges support from the European Research Council (ERC), ERC Consolidator Grant ‘‘HYNANOSTORE” (project number 101045746) and from the European Union –NextGenerationEU, the National Recovery and Resilience Plan (NRRP), Project code PE0000021, “Network 4 Energy Sustainable Transition –NEST” – CUP B53C22004060006.
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