121st General Meeting of the KCS

Type Poster Presentation
Area Material Chemistry
Room No. Event Hall
Time 4월 20일 (금요일) 11:00~12:30
Code MAT.P-496
Subject One-pot green synthesis of N-doped carbon dots for bioimaging and TiO2 nanoparticles@N-doped carbon for the degradation of organic dye
Authors Atchudan Raji, Yong Rok Lee*
Division of Chemical Engineering, Yeungnam University, Korea
Abstract Titanium dioxide nanoparticles distributed nitrogen-doped carbon (TiO2 NPs@C) nanocomposite along with nitrogen-doped carbon dots (N-CDs) were synthesized by a simple hydrothermal method. The synthesized materials were systematically characterized by various physicochemical techniques including X-ray diffraction (XRD), attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy, field emission scanning electron microscopy (FESEM) with energy-dispersive X-ray (EDX) spectroscopy, high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, ultraviolet-visible (UV-vis) spectroscopy, and fluorescence spectroscopy. Anatase TiO2 NPs with a mean size of 5 nm were anchored on the surface of carbon framework in the TiO2 NPs@C nanocomposite and the prepared nanocomposite enhances the photocatalytic performance towards methylene blue (MB)-degradation under UV-light irradiation. The degradation efficiency of synthesized TiO2 NPs@C nanocomposite is about 90% when extending the irradiation time to 40 min with a rate constant of 0.0593 min−1. The rate constant of synthesized TiO2 NPs@C nanocomposite is 5 times higher than that of bare TiO2 NPs on MB degradation. The augmentation of photocatalytic activity of TiO2 NPs@C nanocomposite was attributed to the synergetic effect between TiO2 NPs and nitrogen-doped carbon structure. In addition, the obtained N-CDs exhibit a uniform dispersion and a relatively narrow size distribution with an average diameter of 4 nm. The N-CDs were utilized as a powerful in-vitro fluorescent probe for the detection of cells in the biological system due to its excellent water dispersibility and autofluorescence with good biocompatibility. Moreover, the economic natural green source was involved for the synthesis of TiO2 NPs@C nanocomposite and N-CDs which is an alternate for other traditional carbon-based metal oxides photocatalyst for organic dye degradation and alternate for fluorescent semiconducting quantum dots for cell imaging.
E-mail atchudanr@gmail.com