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Novel Covalent Organic Nanosheets for Construction of Ultrafine and Well-dispersed Metal Nanoparticles

Abstract

Developing supported ultrafine metal nanoparticles (U-MNPs) with well-dispersed and high metal content remains a significant challenge while desirable. We herein propose an effective functional covalent organic nanosheets (CONs) strategy for constructing well-dispersed U-MNPs. To illustrate this strategy, 4,7-diamino-1H-indazole (DAI) and 1,3,5-triformylphloroglucinol (TFP) are strategically chosen as precursors to construct the corresponding CON-DAI-TFP. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), and atomic force microscopy (AFM) clearly confirm the nanosheet structure of CON-DAI-TFP. CON-DAI-TFP is used as substrate to immobilize Pd nanoparticles (Pd-NPs). The supported Pd-NPs exhibit ultrafine, highly-dispersed, and high metal content (average size, 1.74 nm; metal content, 20.47 wt%), which is superior to many reported supported Pd-NPs. Moreover, the supported Pd-NPs show excellent catalytic activity and recyclability in a p-nitrophenol reduction reaction. In addition to Pd-NPs, this strategy can be applied to produce other U-MNPs with similar features, including Ir-NPs and Pt-NPs (1.99 nm and 17.18 wt% for Ir-NPs, 2.25 nm and 29.46 wt% for Pt-NPs), suggesting that this strategy is universal. For comparison, a bulk COF (COF-DAI-TFB), which is analogue of CON-DAI-TFP, is designed and synthesized. In contrast, many Pd-NPs are observed to lie on the surface of the COF-DAI-TFB with large sizes (average size, 17.86 nm), which is more than 10 times the size of Pd-NPs on CON-DAI-TFP. This result further confirms the significance of CONs in the preparation of well-dispersed and high-loading U-MNPs.

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Supplementary files

Article information


Submitted
12 May 2020
Accepted
11 Jun 2020
First published
12 Jun 2020

New J. Chem., 2020, Accepted Manuscript
Article type
Paper

Novel Covalent Organic Nanosheets for Construction of Ultrafine and Well-dispersed Metal Nanoparticles

F. Lu, Y. Li, Q. Shi, C. Zhao, S. Li and S. Pang, New J. Chem., 2020, Accepted Manuscript , DOI: 10.1039/D0NJ02410D

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