材料科学
相变
电介质
光电效应
Crystal(编程语言)
化学物理
相(物质)
晶体结构
过渡金属
光电子学
纳米技术
凝聚态物理
结晶学
有机化学
化学
物理
计算机科学
催化作用
程序设计语言
作者
Yan-Ling Luo,Lin Zhou,Yong-Ju Bai,Xiaoyun Huang,Xuan Zhu,Xin Yan,Xin Deng,Yanjuan Wang,Hui‐Peng Lv,Yuan‐Yuan Tang
标识
DOI:10.1021/acsami.4c03496
摘要
Phase transition materials with switchable second-order nonlinear optical (NLO) properties have attracted extensive attention because of their great application potential in photoelectric switches, sensors, and modulators, while metal-free organics with NLO switchability near room temperature remain scarce. Herein, we report a hydrogen-bonded metal-free organic crystal, 2-methylpropan-2-aminium 2,2-dimethylpropanoate (1), exhibiting a room-temperature phase transition and favorable NLO switchability. Through investigations on its thermal anomalies, dielectric properties, and crystal structures, we uncover that 1 holds a near-room-temperature phase transition at 303 K from noncentrosymmetric point group C2v to centrosymmetric one D2h, which is attributed to the order–disorder transformations of both tert-butylamine cations and dimethylpropionic acid anions. Accompanied by symmetry change during the phase transition, 1 exhibits reversible and repeatable NLO "on–off" switchability with a desirable switching contrast ratio of ca. 19 between high and low NLO states. This discovery demonstrates a metal-free organic crystal with NLO switching behavior near room temperature, serving as a promising candidate in smart and ecofriendly photoelectric functional materials and devices.
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