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Nanomaterials 2016, 6(9), 164; doi:10.3390/nano6090164

A Tunable Photoluminescent Composite of Cellulose Nanofibrils and CdS Quantum Dots

State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China
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Author to whom correspondence should be addressed.
Academic Editors: John H. T. Luong and Sandeep Kumar Vashist
Received: 4 July 2016 / Revised: 19 August 2016 / Accepted: 31 August 2016 / Published: 7 September 2016
(This article belongs to the Special Issue Emerging Applications of Cellulose Nanocrystal and Its Composites)
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Abstract

The preparation of fluorescent nanocomposite materials with tunable emission wavelengths by combining cellulose nanofibrils (CNFs) with inorganic nanoparticles is important for promoting CNFs applications. A CNF/CdS nanocomposite was prepared via in situ compositing at room temperature on oxidized CNFs with CdS quantum dots. By controlling the –COOH/Cd2+ ratio on the CNF, the feeding time of Na2S and the ultrasonic maturing time, the size of the CdS quantum dots on the CNF surface could be adjusted so that to obtain the CNF/CdS nanocomposite material with different fluorescent colors. The results indicated that the CdS particles quantized were evenly distributed on the CNF. The maximum average size of the CdS nanoparticles glowed red under the excitation of UV light was 5.34 nm, which could be obtained with a –COOH/Cd2+ ratio of 1.0, a Na2S feeding time of 20 min, and an ultrasonic maturing time of 60 min. A series of CNF/CdS nanocomposite materials were obtained with CdS nanoparticle sizes varying from 3.44 nm to 5.34 nm, the emission wavelength of which varied from 546 nm to 655 nm, and their fluorescence color changed from green to yellow to red. This is the first time the fluorescence-tunable effect of the CNF/CdS nanocomposite has been realized. View Full-Text
Keywords: cellulose nanofibrils; CdS; quantum size effect; photoluminescence performance cellulose nanofibrils; CdS; quantum size effect; photoluminescence performance
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Wang, Q.; Tang, A.; Liu, Y.; Fang, Z.; Fu, S. A Tunable Photoluminescent Composite of Cellulose Nanofibrils and CdS Quantum Dots. Nanomaterials 2016, 6, 164.

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