A convenient method for isolating carbon quantum dots in high yield as an alternative to the dialysis process and the fabrication of a full-band UV blocking polymer film. (19th October 2018)

• Record Type: Journal Article
• Authors: Uthirakumar, Periyayya; Devendiran, M.; Kim, Tae Hwan; Lee, In-Hwan
• Is Part Of: New journal of chemistry. Volume 42:Number 22(2018)
• Page Start: 18312
• Page End: 18317
• Publication Date: 2018-10-19
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/c8nj04615h
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : A convenient method to isolate >80% CQD and the fabrication of a non-toxic CQD polymer film which could protect UV-sensitive foods. Abstract : We introduce a facile and convenient method to isolate more than 80% carbon quantum dots (CQD), for the first time. The proposed method substitutes a lengthy conventional dialysis process. An organic solvent, n -butanol is used to extract CQD in a high yield with the cumulative particle size distribution at 2.6 nm. The polymer films were fabricated as a function of increasing content of CQD, and shielded full-band UV light. It is found that the presence of surface functional groups in the CQD creates a high level of dispersion in the polymer matrix and it can block >99% of UV light with just 10 mg of CQD. A plausible mechanism is proposed to explain the superior UV shielding properties of the polymer film and is confirmed by protection of a photo-degradable model dye. Due to being non-toxic and environmentally friendly, the CQD dispersed polymer film could be a promising material in the food packaging industry to protect UV sensitive foods.