Photocatalytic activity of silicon-based nanoflakes for the decomposition of nitrogen monoxide. Issue 26 (26th June 2017)

• Record Type: Journal Article
• Authors: Itahara, Hiroshi; Wu, Xiaoyong; Imagawa, Haruo; Yin, Shu; Kojima, Kazunobu; Chichibu, Shigefusa F.; Sato, Tsugio
• Is Part Of: Dalton transactions. Volume 46:Issue 26(2017)
• Page Start: 8643
• Page End: 8648
• Publication Date: 2017-06-26
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c7dt01682d
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : The photocatalytic decomposition of nitrogen monoxide was achieved using one-pot synthesized nanocomposite powders composed of Si nanoflakes and metallic particles. 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 Ni3 Si) 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.