Self-powered stimuli responsive material for dual stimulation of heat and guest molecules

Stimuli-responsive smart materials exhibit reverse chemical/physical changes in response to external stimuli and research on stimuli-responsive smart materials with self-powered properties is still uncultivated ground. Here, we report perovskite crystalline self-powered multiple stimuli-responsive materials triggered by chemical and thermal stimuli. [HMEP]PbI3 center dot(H2O) ( 1 ; HMEP is a hydroxytris(1-methylethyl)phosphorus cation) crystallizes in a chiral space group P 21 at 293 K and has the piezoelec-tric reaction ( d33 = 10 pC/N and output voltage = 1 V) of self-powered modes, this value is larger than the value of 3 pC/N for the classical piezoelectric material ZnO. Piezoelectric materials can generate en-ergy due to mechanical deformation, and using thermal heating to lose water, [HMEP]PbI3 ( 2 ) can be obtained. 2 crystallizes in the non-centrosymmetric space group , undergoes two reversible phase transitions at 243/255 K and 315/348 K, and shows second harmonic generation switching. Interestingly, 2 can return to the hydrated form 1 after absorbing water. This work will lay the foundation for self-powered stimuli-responsive compounds and contribute to the construction of novel organic-inorganic hybrid materials with second harmonic generation switching. (c) 2023 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.