Scientists have made multilayered films of inorganic nanoparticles with the help of DNA bases.A team of researchers,led by Dayang Wang,at the Max Planck Institute of Colloids and Interfaces,Potsdam,Germany,formed a layer of gold nanoparticles at the interface between water and toluene.By alternately changing the surface groups on the gold nanoparticles through specific pairing of functionalised DNA bases,Wang attached a layer of positively-charged cadmium telluride nanoparticles on the aqueous side of the interface and a layer of hydrophobic silver nanoparticles on the organic side.
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