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Issue 26, 2017
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Photocatalytic activity of silicon-based nanoflakes for the decomposition of nitrogen monoxide

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Abstract

The photocatalytic decomposition of nitrogen monoxide (NO) was achieved for the first time using Si-based nanomaterials. Nanocomposite powders composed of Si nanoflakes and metallic particles (Ni and Ni3Si) were synthesized using a simple one-pot reaction of layered CaSi2 and NiCl2. The synthesized nanocomposites have a wide optical absorption band from the visible to the ultraviolet. Under the assumption of a direct transition, the photoabsorption behavior is well described and an absorption edge of ca. 1.8 eV is indicated. Conventional Si and SiO powders with indirect absorption edges of 1.1 and 1.4 eV, respectively, exhibit considerably low photocatalytic activities for NO decomposition. In contrast, the synthesized nanocomposites exhibited photocatalytic activities under irradiation with light at wavelengths >290 nm (<4.28 eV). The photocatalytic activities of the nanocomposites were confirmed to be constant and did not degrade with the light irradiation time.

Graphical abstract: Photocatalytic activity of silicon-based nanoflakes for the decomposition of nitrogen monoxide

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Publication details

The article was received on 09 May 2017, accepted on 08 Jun 2017 and first published on 08 Jun 2017


Article type: Paper
DOI: 10.1039/C7DT01682D
Citation: Dalton Trans., 2017,46, 8643-8648
  • Open access: Creative Commons BY license
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    Photocatalytic activity of silicon-based nanoflakes for the decomposition of nitrogen monoxide

    H. Itahara, X. Wu, H. Imagawa, S. Yin, K. Kojima, S. F. Chichibu and T. Sato, Dalton Trans., 2017, 46, 8643
    DOI: 10.1039/C7DT01682D

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