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Cellulose

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Fluorescent CdTe-QD-encoded nanocellulose microspheres by green spraying method

  • Qingshun Guan
  • Ruyuan Song
  • Weibing Wu
  • Lei Zhang
  • Yi Jing
  • Hongqi Dai
  • Guigan Fang
Original Paper
  • 36 Downloads

Abstract

With water-soluble CdTe quantum Dots (QDs) as fluorescent labels and TEMPO-oxidized cellulose nanofibrils (CNF) as matrix, dual-color QD-encoded microspheres were prepared by mechanical spraying, freeze-molding and subsequent electrostatic cross-linking by calcium ion. The entire preparation process was accomplished in aqueous phase without any chemical treatment. The nanocellulose microspheres possessed porous structure and were able to be dispersed stably in water in the form of hydrogels. CdTe QDs were efficiently fixed in the network of intertwined nanofibrils via hydrogen bonding with CNF, making the microspheres to obtain high photoluminescence (PL) intensity and identifiable encoding signals consisting of seven kinds of microsphere arrays. The crystalline structure and chemical composition of both CdTe QDs and CNF were not affected during the preparation process. The comparision of PL behaviors of CdTe QDs and QD-encoded microspheres in different media indicate that CNF matrix provided good protection of QDs and improved the PL intensity and photostability.

Graphical Abstract

Dual-color CdTe-encoded nanocellulose microspheres were prepared via pure physical process in aqueous phase. The fluorescent microspheres possessed high photoluminescence intensity and identifiable seven kinds of encoding signals. The nanocellulose matrix provided good protection of CdTe QDs and improved the photoluminescence intensity and photostability.

Keywords

Quantum dots Fluorescent microspheres Nanocellulose Fluorescence coding 

Notes

Acknowledgments

The support of this work by the Natural Science Foundation of Jiangsu Province (BK20171450), National Key Research and Development Program of China (2017YFD0601005), and Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) are gratefully acknowledged.

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Copyright information

© Springer Nature B.V. 2018

Authors and Affiliations

  1. 1.Jiangsu Co-Innovation Center for Efficient Processing and Utilization of Forest Resources, Jiangsu Provincial Key Lab of Pulp and Paper Science and TechnologyNanjing Forestry UniversityNanjingChina
  2. 2.Key Laboratory for Organic Electronics and Information, National Jiangsu, Synergetic Innovation Center for Advanced Materials (SICAM)Nanjing University of Posts and TelecommunicationsNanjingChina
  3. 3.Institute of Chemical Industry of Forestry ProductsChinese Academy of ForestryNanjingChina

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