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In this paper, we reported a one-step and facile method to prepare boron carbon oxynitride (BCNO) nanosheet and titanium dioxide (TiO2) loaded BCNO nanocomposites. The BCNO nanosheet not only can widen the absorption range of TiO2 from ultraviolet to visible region, but also increase the photodegradation ability. The TiO2/BCNO nanocomposites have excellent photo-degradation performance on organic dyes. The TiO2-2/BCNO-2 nanocomposite can degrade almost all of methylene blue (MB) and rhodamine B (RhB) during 50 and 300 min under visible light irradiation, respectively. In addition, the photocatalytic mechanism can be explained by the electron transition process between TiO2 and BCNO.

Ligand protected noble metal nanoclusters have unique physical and chemical properties and the effects of metal nanoclusters on photoluminescence and energy transfer process for fluorescence molecules are still unclear. In this work, we prepared silver nanoclusters (Ag NCs) with different emission wavelengths (blue, green and red emission) and investigated the energy transfer process between Ag NCs and fluorescein isothiocyanate (FITC). The photoluminescence of FITC can be regulated by the Ag NCs due to various electrons transfer and energy transfer processes between Ag NCs and FITC. The FITC can serve as electrons donor or acceptor which determines the electrons transfer direction between FITC and Ag NCs with different emissions. Astonishingly, the photobleaching of FITC can be effectively inhibited after interacting with Ag NCs, which will surely be of profound significance to the application of FITC.