Opto-Electric-Magnetic Coupling Properties of Tetrathiafulvalene-Pyromelliticdiimide Organic Cocrystals
The rapid development of intelligent robots raises increasing demand of multifunctional sensing materials and devices.However,most of currently developed materials only have two-field coupling effect.They lack multi-modal sensing ability.This article proposes a new strategy to develop multi-field coupling materials through the control of inter-molecular charge transfer interaction.Here,centimeter long organic co-crystal tetrathiafulvalene(TTF)-pyromelliticdiimide(PMDI)with opto-electric-magnetic coupling effect is developed by saturated precipitation method.It has room-temperature ferroelectric effect with a remnant polarization of 4 pC/cm2.It also shows room-temperature magneto-electric coupling effect,including magnetic field-induced capacitance change of 1.5× 10-3％/Oe and ferroelectric polarization change with magneto-electric coupling coefficient of 1.18 nC/(cm2.Oe).Moreover,this effect can be controlled by light stimuli.It is demonstrated that the relatively weaker inter-molecular charge transfer interaction than that of intra-molecular interaction makes the co-crystal more vulnerable to external stimuli than single component crystal.In addition,the intersystem crossing between singlet and triplet charge transfer state also induces magnetic-field effect and influences the electric dipoles related capacitance and polarization.All these factors lead to the generation of multiple freedom to tune the opto-electric-magnetic properties of the co-crystal.The results of this study will promote the development of multifunctional cocrystal materials and devices,and promote their applications for multifunctional sensing.
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维普
