Low-dimensional ternary silver halide (CsAg 2 I 3 ), an emerging inorganic lead-free perovskite, has garnered significant scientific attention due to its strong quantum confinement effects, wide bandgaps, non-toxicity, and others. However, the photophysical properties and optoelectronic performance of CsAg 2 I 3 materials and devices are significantly compromised by crystal quality and defects arising from liquid-phase preparation. Herein, 1D CsAg 2 I 3 single crystals newly grown by the chemical vapor deposition method are reported. These crystals display exceptional quality and stability over a 3-month period despite exposure to air and moisture. The high in-plane anisotropic structure, phonon vibrations, and refractive index of CsAg 2 I 3 crystals are also experimentally elucidated. Polarization-sensitive ultraviolet photodetector based on the CsAg 2 I 3 monocrystal features a responsivity of 139 mA W −1 , a specific detectivity of 1.05 × 10 11 cm Hz 1/2 W −1 , an ultra-fast photoresponse speed of 48.2/69.1 µs, and a dichroic ratio of 2.66 upon 360 nm irradiation at −5.0 V bias. The photodetector excels amongst its competitors, moving toward the potential application of rapid optical anti-counterfeiting identification. This work, which leverages grown high-crystalline and highly stable CsAg 2 I 3 monocrystals, holds promises for advancing this functional material into a robust next-generation optoelectronic devices capable of probing sensitive optical sensing and specific azimuth recognition.
Traditional hydrogel-based strain sensors do not work well under water due to extreme swelling and poor adhesion to substrates in water-rich conditions. Inspired by the jellyfish tentacles, a super stretchable dual crosslinked hydrogel was prepared as a motion sensor underwater. The hydrogel contained a cationic surfactant , hexadecyl trimethyl ammonium bromide (CTAB), that crosslinked with hydrophobic lauryl methacrylate (LMA) units in an AA-LMA copolymer . Al 3+ ions also coordinated with carboxyl groups in PAA chains and amino groups on chitosan (CS) to form ionic crosslink points. The formed hydrogel exhibited excellent anti-swelling characteristics, superior tensile properties (≈3000%), and rapid self-healing performance. Due to the complementary effects of electrostatic interactions and dynamic chemical bond formation, the hydrogel efficiently and repeatably adhered to various biological tissues, such as hogskin and shrimp, in aquatic environments. Moreover, the hydrogel-based strain sensor showed high sensitivity (GF = 2.04) over a wide sensing range from 0 to 1000% strain with high stability in air and water. The prepared materials' unique performance further expands their application prospects in flexible wearable devices , anti-counterfeiting recognition, and other fields in environmental conditions.
危险品化学品经营许可证（带存储）