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Film plays a key role in the sustainable development of our society. Freestanding thin films of two‐dimensional covalent organic frameworks (COFs) have been produced by interface, spin coating, microwave‐assisted synthesis, and screen printing methods and are applied in nanofiltration, molecular separation, photochemical sensing, anion transport, heat conduction, and proton conduction. On the other...
Imine‐linked covalent organic frameworks (COFs) have attracted extensive attention due to designable structures, tunable properties, and excellent thermal and chemical stability. They were typically obtained as insoluble and unprocessable powders, which seriously limits their full promise. Progress has been made in the synthesis of thin films of imine‐linked COFs by interfacial synthesis. However,...
The off-resonance third-order nonlinear optical (NLO) properties of poly-10, 12 pentacosadiynoic acid (poly-PCDA) has been studied by Z-scan technique using a femtosecond pulse laser with the pulse duration of 100 fs at 800 nm. An eight-monolayer film of poly-PCDA about 26 nm thick was prepared on glass substrate using Langmuir-Schaefer method. The very large value of third-order NLO susceptibility...
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