亚胺
膜
共价键
材料科学
吸收(声学)
光子学
共价有机骨架
化学工程
高分子化学
化学
光电子学
有机化学
复合材料
催化作用
生物化学
工程类
作者
Suresh Bommakanti,Satyapriya Nath,Rudrashish Panda,Sankalpa N. Panda,Jeebanjyoti Mohapatra,Adithyan Puthukkudi,Chetan V. Rajput,Sharmistha Anwar,Ritwick Das,Bishnu P. Biswal
标识
DOI:10.1021/acs.jpclett.4c00589
摘要
Conjugated and processable self-standing vinylene-linked covalent organic framework membranes (COFMs) are highly demanding for photonics and optoelectronics. In this work, we have fabricated the first cyclotriphosphazene (CTP) cored vinylene-linked self-standing COFM (CTP-PDAN). For comparison purposes, we have successfully fabricated the imine-linked congener (CTP-PDA). Leveraging the inherent nonlinear optical (NLO) response of the CTP core, both membranes were directly mounted to evaluate NLO parameters using the open-aperture (OA) Z-scan technique. Direct measurement of NLO responses on membranes is advantageous and free from solvent and scattering effects, making it a more practical approach compared to the conventional dispersion mode. The OA Z-scan transmission yields a reverse saturable absorption signature exhibiting a higher NLO absorption coefficient (β) of 58.37 cm/GW for CTP-PDAN, compared to that of the imine-linked CTP-PDA COFM (β = 8.5 cm/GW). These results can be correlated to the efficient conjugation through the vinylene linkage in CTP-PDAN compared to the imine linked congener.
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