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Keywords:

  • chalcogenides;
  • gels;
  • nanomaterials;
  • raman spectroscopy;
  • reaction mechanisms
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Programmable assembly and disassembly: Chemical and spectroscopic studies show that Se[BOND]Se bond formation is responsible for the oxidation-induced aggregation of thiolate-capped CdSe nanocrystals to gels. Treatment with reducing agents leads to Se[BOND]Se bond cleavage and dispersion of the gel. This process can be cycled, resulting in successively smaller particles (see picture; MUA = 11-mercaptoundecanoic acid, TMAH = tetramethylammonium hydroxide).