Abstract
Nanoparticles (NPs) of Au, Ag, Pt, Pd, Cu and Ni of 2–3 nm average-size and narrow-size distributions were synthesized in DNA cross-linked hydrogels by reducing corresponding metal precursors by sodium borohydride. DNA hydrogel plays a role of a universal reactor in which the reduction of metal precursor results in the formation of 2–3 nm ultrafine metal NPs regardless of metal used. Hydrogels metallized with various metals showed catalytic activity in the reduction of nitroaromatic compounds, and the catalytic activity of metallized hydrogels changed as follows: Pd > Ag ≈ Au ≈ Cu > Ni > Pt. DNA hydrogel-based “soft catalysts” elaborated in this study are promising for green organic synthesis in aqueous media as well as for biomedical in vivo applications.
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Acknowledgments
This work was supported in part by Grant-in-Aid for Exploratory Research (KAKENHI No. 25620183) and Russian Foundation for Basic Research (RFBR No. 14-03-00696). Maruha Nichiro Holdings, Inc. (Japan) is gratefully acknowledged for free DNA samples extracted from salmon milt. We also thank the High Voltage Electron Microscope Laboratory (Institute of Materials and Systems for Sustainability, Nagoya University) for assistance with the TEM observations.
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Zinchenko, A., Che, Y., Taniguchi, S. et al. Metallization of DNA hydrogel: application of soft matter host for preparation and nesting of catalytic nanoparticles. J Nanopart Res 18, 179 (2016). https://doi.org/10.1007/s11051-016-3480-4
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DOI: https://doi.org/10.1007/s11051-016-3480-4