Effect of Water in Fabricating Copper Nanoparticles onto Reduced Graphene Oxide Nanosheets: Application in Catalytic Ullmann-Coupling Reactions

Copper nanoparticles fabricated onto reduced graphene oxide (Cu NPs/rGO) were successfully synthesized via a one-pot dimethylformamide (DMF) reduction approach with an addition of nominal water. This small amount of water can significantly decrease the degree of GO reduction by DMF. As a result, the...

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Bibliographic Details
Published in:Bulletin of the Chemical Society of Japan 2020-10, Vol.93 (10), p.1164-1170
Main Authors: Suktanarak, Pattira, Tanaka, Tatsuya, Nagata, Tatsuki, Kondo, Ryota, Suzuki, Takeyuki, Tuntulani, Thawatchai, Leeladee, Pannee, Obora, Yasushi
Format: Article
Language:English
Subjects:
Chemical reactions
Copper
Coupling
Dimethylformamide
Graphene
Moisture content
Nanoparticles
Nanosheets
Photoelectrons
Reduction
Scanning transmission electron microscopy
X ray photoelectron spectroscopy
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Summary:Copper nanoparticles fabricated onto reduced graphene oxide (Cu NPs/rGO) were successfully synthesized via a one-pot dimethylformamide (DMF) reduction approach with an addition of nominal water. This small amount of water can significantly decrease the degree of GO reduction by DMF. As a result, the remaining oxygen-containing functionality on rGO can still interact with the copper cation precursor leading to the high Cu content fabricated onto the support material, which was evidenced by X-ray photoelectron spectroscopy (XPS). Moreover, small particle sizes and high dispersion of Cu NPs on rGO were confirmed by scanning transmission electron microscopy (STEM). In addition, our Cu NPs/rGO was competent to catalyze the Ullmann-coupling reaction (i.e., arylation of 3,5-dimethylphenol with 86% yield and turnover number of 2,642).
ISSN:0009-2673
1348-0634
DOI:10.1246/bcsj.20200115