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Upconversion and Downconversion Fluorescent Graphene Quantum Dots:
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A facile ultrasonic route for the fabrication of graphene quantum dots (GQDs) with upconvertedemissionispresented.Theas-prepared GQDs exhibit an excitation-independent downcon-version and upconversion photoluminescent (PL) behavior, and the complex photocatalysts (rutileTiO2/GQD and anatase TiO2/GQD systems) were designedtoharnessthevisiblespectrumofsunlight. It is interesting that the photocatalytic rate of the rutile TiO2/GQD complex system is ca.9times larger than that of the anatase TiO2/GQD complex under visible light (¦Ë > 420 nm) irradiation in the degradation of methylene blue. ±¾ÎĶԷ¢¹â»úÀíµÄ½âÊͷdz£µÄÇå³þ£¬²¢½²½âÁ˹â´ß»¯ÐÔÖÊ¡£ÐÂÓ±Ö®´¦ÊÇÔÚÖÆ±¸µÄ·½·¨ÉÏÊdz¬ÉùÖÆ±¸¡£ÖµµÃÒ»¶ÁŶ£¡ |
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