Yang Wenqi, Yamamoto Shinya, Sueyoshi Keiichiro, Inadomi Takumi, Kato Riki, Miyamoto Nobuyoshi
Graduate School of Engineering, Fukuoka Institute of Technology, 3-30-1 Wajiro-higashi, Higashi-ku, Fukuoka, 811-0295, Japan.
Angew Chem Int Ed Engl. 2021 Apr 6;60(15):8466-8471. doi: 10.1002/anie.202015982. Epub 2021 Mar 3.
Structural color colloidal sols of perovskite nanosheets were synthesized and were immobilized in a polymer hydrogel film by in situ photopolymerization, leading to a novel mechanochromic material. Visible absorption spectroscopy, polarized optical microscopy and small-angle X-ray scattering revealed that the nanosheets are aligned parallel to the film surface with the periodic distance of up to ca. 300 nm, giving the structural color tunable over full color range. The present structural color gel showed reversible mechanochromic response that detects weak stress of 1 kPa with the quick response time less than 1 ms as well as high mechanical toughness (compressive breaking stress of up to 3 MPa). These excellent properties are suitable for applications for mechano-sensors and displays.
通过原位光聚合合成了钙钛矿纳米片的结构色胶体溶胶，并将其固定在聚合物水凝胶薄膜中，从而得到一种新型的机械变色材料。可见吸收光谱、偏光光学显微镜和小角X射线散射表明，纳米片与薄膜表面平行排列，周期距离可达约300 nm，使得结构色在全色范围内可调。目前的结构色凝胶表现出可逆的机械变色响应，能够检测1 kPa的微弱应力，响应时间小于1 ms，同时具有高机械韧性（压缩断裂应力高达3 MPa）。这些优异的性能适用于机械传感器和显示器等应用。
