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Open AccessArticle

Preparation and Properties of Cyanobacteria-Based Carbon Quantum Dots/Polyvinyl Alcohol/ Nanocellulose Composite

by Li Xu 1,2,3,*, Ying Li 1,2,3, Shiyu Gao 1,2,3, Yue Niu 1, Huaxuan Liu 1, Changtong Mei 1,2,3, Jiabin Cai 1,2,3 and Changyan Xu 1,2,3,*
1
College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China
2
Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Products, Nanjing Forestry University, Nanjing 210037, China
3
Jiangsu Province Key Laboratory of Green Biomass-Based Fuels and Chemicals, Nanjing Forestry University, Nanjing 210037, China
*
Authors to whom correspondence should be addressed.
Polymers 2020, 12(5), 1143; https://doi.org/10.3390/polym12051143
Received: 7 April 2020 / Revised: 2 May 2020 / Accepted: 15 May 2020 / Published: 17 May 2020
(This article belongs to the Special Issue Natural Compounds for Natural Polymers II)
Blue luminescent carbon quantum dots (CQDs) were prepared from cyanobacteria by a hydrothermal method. The PL quantum yields of the obtained CQDs was 5.30%. Cyanobacteria-based carbon quantum dots/polyvinyl alcohol/nanocellulose composite films were prepared, which could emit bright blue under UV light. FTIR characterization showed that the composite films had hydroxyl groups on the surface and no new groups were formed after combining the three materials. The photoluminescence (PL) spectra revealed that the emission of the prepared CQDs was excitation dependent. Studies on the water resistance performance and light barrier properties of the composite films showed that they possessed higher water resistance properties and better UV/infrared light barrier properties. Therefore, we report the cyanobacteria-based carbon quantum dots/polyvinyl alcohol/nanocellulose composite films have the potential to be applied in flexible packaging materials, anti-fake materials, UV/infrared light barrier materials and so on. View Full-Text
Keywords: cyanobacteria; carbon quantum dots; PVA; CNF; fluorescence; UV barrier; flexible cyanobacteria; carbon quantum dots; PVA; CNF; fluorescence; UV barrier; flexible
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Xu, L.; Li, Y.; Gao, S.; Niu, Y.; Liu, H.; Mei, C.; Cai, J.; Xu, C. Preparation and Properties of Cyanobacteria-Based Carbon Quantum Dots/Polyvinyl Alcohol/ Nanocellulose Composite. Polymers 2020, 12, 1143.

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