Regulation of Third‐Order NLO Properties by Central Metal Exchange of Heterogeneous MOFs@CeO2. Issue 24 (17th October 2022)

• Record Type: Journal Article
• Authors: Huang, Jing; Lang, Feifan; Cui, Yang; Xie, Lixia; Geng, Kangshuai; Zhao, Yujie; Hou, Hongwei
• Is Part Of: Advanced optical materials. Volume 10:Issue 24(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-10-17
• Subjects: central metal exchange -- heterojunctions -- metal‐organic frameworks -- third‐order nonlinear optical properties; Optical materials -- Periodicals; Photonics -- Periodicals; 620.11295
• DOI: 10.1002/adom.202201872
• Languages: English
• ISSNs: 2195-1071

Abstract

Abstract: Changing the chemical composition and generating heterogeneous structures have a synergistic effect on the third‐order nonlinear optical (NLO) properties of metal–organic frameworks (MOFs) materials. In this work, it is demonstrated that the transformations from a parent‐MOF [Zn4 (dcpp)2 (DMF)3 (H2 O)2 ] n (1, dcpp = 3, 4‐bis(4‐carboxyphenyl)phthalate) into two child‐MOFs, [Cu4 (dcpp)2 (DMF)3 (H2 O)2 ] n (2 ) or [Zn2.5 Co1.5 (dcpp)2 (DMF)3 (H2 O)2 ] n (3 ), via central metal exchange can regulate the third‐order NLO properties of the parent‐MOF, especially its third‐order NLO absorption signal can change from the reverse saturable absorption (RSA) to the saturable absorption (SA) when Cu 2+ are introduced. Heterogeneous 1@CeO2 materials are further engineered by depositing CeO2 nanospheres onto the whole surface of 1, and are surprisingly still able to be exchanged into 2@CeO2 or 3@CeO2 . Analyses on these MOFs@CeO2 indicate that the interfacial interaction between metal oxide particles and MOFs surface can effectively tune the charge transfer efficiency of the material which leads to their third‐order NLO refraction signals. The interface inducement of CeO2 ‐shell to the MOF‐core also significantly changes their third‐order NLO properties compared to pure MOFs. This work provides new insights and efficient strategies for the development of new third‐order NLO materials with potential practical usage. Abstract : Heterogeneous metal–organic frameworks (MOFs)@CeO2 particles are synthesized in situ and the metal ions can vary via central metal exchange without damaging the heterojunction interface. Such products exhibit diverse tuning effects on the third‐order nonlinear optical properties compared to the corresponding pure MOFs by modulating the charge transfer of their structures and on their surfaces.