• Altamura, Davide
• Rizzo, Aurora
• Cinquino, Marco
• Giannini, Cinzia
• Marco, Luisa De
• Maiorano, Vincenzo
• Giuri, Antonella
• Corcione, Carola Esposito
• Pugliese, Marco
• Gigli, Giuseppe
• Giannuzzi, Roberto
• Prontera, Carmela Tania
• Mariano, Fabrizio
• Maggiore, Antonio

Abstract

<jats:title>Abstract</jats:title><jats:p>Hybrid organic–inorganic perovskites (PVKs) are among the most promising materials for optoelectronic applications thanks to their outstanding photophysical properties and easy synthesis. Herein, a new PVK‐based thermochromic composite is demonstrated. It can reversibly switch from a transparent state (transmittance &gt; 80%) at room temperature to a colored state (transmittance &lt; 10%) at high temperature, with very fast kinetics, taking only a few seconds to go from the bleached to the colored state (and vice versa). X‐ray diffraction, Fourier‐transform infrared spectroscopy, differential scanning calometry, rheological, and optical measurements carried out during heating/cooling cycles reveal that thermochromism in the material is based on a reversible process of PVK disassembly/assembly mediated by intercalating polymeric chains, through the formation and breaking of hydrogen bonds between polymer and perovskite. Therefore, differently from other thermochromic perovskites, that generally work with the adsorption/desorption of volatile molecules, the system is able to perform several heating/cooling cycles regardless of environmental conditions. The color and transition temperature (from 70 to 120 °C) can be tuned depending on the type of perovskite. Moreover, this thermochromic material is printable and can be deposited by cheap techniques, paving the way for a new class of smart coatings with an unprecedented range of colors.</jats:p>

Topics

• perovskite
• impedance spectroscopy
• polymer
• composite
• Hydrogen
• infrared spectroscopy