Fabrication of Multicolor-Encoded Microspheres by Tagging Semiconductor Nanocrystals to Hydrogel Spheres


  • This work supported by Max Planck Society. M.G. is partly supported by an 863 project (2002AA302201) from the Chinese Ministry of Science and Technology and a NSFC project (20225313).


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Single- or multicolor-encoded microspheres are created by confining water-soluble CdTe nanocrystals with different sizes within hydrogel microspheres of N-isopropylacrylamide and 4-vinylpyridine copolymer based on the pH-responsive swelling behavior of the gel (see Figure). The emission intensity level and color of the resulting fluorescent spheres can be manipulated simply by changing the concentrations of the different-sized NCs and their molar ratios.