Dendronized Cellulose Nanocrystals as Templates for Preparation of ZnS and CdS Quantum Dots |
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| Authors: | Mohammad L Hassan Shaimaa M Fadel Charles Moorefield George R Newkome |
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| Institution: | 1. Cellulose and Paper Department, National Research Center, Dokki, Giza 12622, Egypt;2. Center of Excellence for Advanced Sciences, Advanced Materials and Nanotechnology Group, National Research Center, Dokki, Giza 12622, Egyptmlhassan2012@yahoo.com;4. Department of Polymer Science, University of Akron, Akron, Ohio 44325;5. Departments of Polymer Science and Chemistry, University of Akron, Akron, Ohio 44325 |
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| Abstract: | Cellulose nanocrystals (CNC) isolated from bleached bagasse pulp were modified with a second-generation isocyanate dendron (G2-dendron) to prepare dendronized cellulose nanocrystals (DCN). Transmission electron microscopy (TEM), elemental analysis for nitrogen, Fourier transform infrared (FTIR) and 13C magic angle spinning nuclear magnetic resonance (13C MAS NMR) proved occurrence of the modification of cellulose nanocrystals surfaces. The dendronized cellulose nanocrystals were used as templates for formation of ZnS and CdS quantum dots with uniform diameter at low temperature in water. The prepared DCN/QDs were highly soluble in water. TEM images showed that the size of the prepared quantum dots was about 5 nm in diameter. UV-Visible and fluorescence spectroscopy showed absorption and emission at wavelength values lower than that reported for bulk ZnS and CdS. |
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| Keywords: | Cellulose nanocrystals dendronized quantum dots cadmium sulfide zinc sulfide |
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