Affiliation:
1. CNR NANOTEC — Institute of Nanotechnology Nationa Research Council c/o Campus Ecotekne, Via Monteroni Lecce 73100 Italy
2. Dipartimento di Matematica e Fisica E. De Giorgi, Università Del Salento Campus Ecotekne via Monteroni Lecce 73100 Italy
3. Institute of Crystallography CNR‐IC Via Amendola 122/O Bari 70126 Italy
4. Dipartimento di Ingegneria dell'Innovazione Università Del Salento Campus Ecotekne via Monteroni Lecce 73100 Italy
Abstract
AbstractHybrid 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 > 80%) at room temperature to a colored state (transmittance < 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.
Funder
Regione Puglia
European Commission
Ministero dell'Università e della Ricerca
HORIZON EUROPE European Research Council
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
Cited by
4 articles.
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