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Photochemical strategies for green synthesizing ultrathin Au nanosheets using photoinduced free radical generation and their catalytic properties

Abstract

Two-dimensional gold nanosheets represent a class of materials with excellent chemical and structural properties, which are often prepared using template or toxic CO in the organic solvents. Here, we report methylene blue (MB) radicals as a reducing agent to grow freestanding hexagonal ultrathin Au nanosheets with well-tuned thickness in water. This is the first time carbon organic radicals have been used as a reducing agent in metal nanosheet synthesis. Notably, no template is used throughout the synthesis process, and the yield of Au nanosheets is very high. It is found that MB is decisive in the growth of Au nanosheets because no Au nanosheets are obtained in the absence of MB under the same reaction parameters. The resulting nanosheets exhibit excellent catalytic activity during H2O2 decomposition to generate nontoxic O2. Thus folic acid-conjugated oxygen-generation nanosheets could highly sensitive detect cancer cells in serum samples through pressure signal. Furthermore, the nanosheets exhibit high efficient activity and selectivity toward hydrogenation of α,β-unsaturated aldehydes. We anticipate that the using MB radicals to the high-yield synthesis of 2D materials in this unique system has demonstrated its effectiveness and provides a green alternative route for producing other 2D nanomaterials.

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Publication details

The article was received on 18 Jun 2018, accepted on 03 Sep 2018 and first published on 04 Sep 2018


Article type: Paper
DOI: 10.1039/C8NR04942D
Citation: Nanoscale, 2018, Accepted Manuscript
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    Photochemical strategies for green synthesizing ultrathin Au nanosheets using photoinduced free radical generation and their catalytic properties

    S. He, J. Hai, T. Li, S. Liu, F. Chen and B. Wang, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR04942D

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