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YONGLING FANG,SONG XU,ZHONGYU LI,DANAN HAN,DAYONG LU 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.3
A 1,3-bis[(3,3-dimethylindolin-2-ylidene)methyl]squaraine (ISQ) dye sensitized ZnO nanocompo-sites via two di®erent preparation methods including hydrothermal and ultrasonic sensitizationprocesses are discussed in this paper. The as-prepared composites were characterized by the X-raydi®raction (XRD), UV-Vis di®use re°ectance spectroscopy (DRS), Raman spectroscopy, andtransmission electron microscopy (TEM). Based on the XRD patterns and TEM images, the ISQ/ZnO nanocomposites still kept the characteristic peaks and the basic morphology of ZnO and ISQdye. The photocatalytic activity of ISQ/ZnO nanocomposites was investigated by degradingmethylene blue (MB) under visible-light illumination. Compared with the MB self-degradation rate,the photocatalytic activity of the ISQ/ZnO composites was enhanced remarkably. The ISQ/ZnOnanocomposites fabricated by ultrasonic sensitization method exhibited excellent photocatalyticdegradation rate, approximately 20% higher than that of the hydrothermal sensitization one.