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

Hiroshi Itahara, Xiaoyong Wu, Haruo Imagawa, Shu Yin, Kazunobu Kojima, Shigefusa F. Chichibu, Tsugio Sato

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)8643-8648
Number of pages6
JournalDalton Transactions
Issue number26
Publication statusPublished - 2017


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