High-yield synthesis and optical properties of g-C<inf>3</inf>N<inf>4</inf>

Yanwen Yuan, Lulu Zhang, Jun Xing, M. Iqbal Bakti Utama, Xin Lu, Kezhao Du, Yongmei Li, Xiao Hu, Shijie Wang, Aziz Genç, Rafal Dunin-Borkowski, Jordi Arbiol, Qihua Xiong

    Research output: Contribution to journalArticleResearchpeer-review

    310 Citations (Scopus)


    © The Royal Society of Chemistry. Graphitic carbon nitride (g-C3N4), a metal-free semiconductor with a band gap of 2.7 eV, has received considerable attention owing to its fascinating photocatalytic performances under visible-light. g-C3N4 exhibits high thermal and chemical stability and non-toxicity such that it has been considered as the most promising photocatalyst for environmental improvement and energy conservation. Hence, it is of great importance to obtain high-quality g-C3N4 and gain a clear understanding of its optical properties. Herein, we report a high-yield synthesis of g-C3N4 products via heating of high vacuum-sealed melamine powder in an ampoule at temperatures between 450 and 650°C. Using transmission electron microscopy (TEM), scanning transmission electron microscopy (STEM), electron energy loss spectroscopy (EELS), thermogravimetric analysis (TGA), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS), the chemical composition and crystallization of the as-produced g-C3N4 are demonstrated. A systematic optical study of g-C3N4 is carried out with several approaches. The optical phonon behavior of g-C3N4 is revealed by infrared and Raman spectroscopy, and the emission properties of g-C3N4 are investigated using photoluminescence (PL) spectroscopy, while the photocatalytic properties are explored by the photodegradation experiment.
    Original languageEnglish
    Pages (from-to)12343-12350
    Issue number29
    Publication statusPublished - 7 Aug 2015


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