Growth Of Catalytically Active Nobel Metal Nanoparticles Under The Orientation Of DNA Template

So far, it is elusive yet what the mechanism that DNA superstructures organize the inorganic nanomaterials into complicated architectures through the bottom-up method. How to produce metal nanocrystals in a controllable and reproducible way is also a challenge for the nanofabrication.In this article, we studied the effect of G-rich and C-rich DNA sequences on the formation of nobel metal nanocrystals including Ag, Pd, etc. Conformational structures of single-stranded DNA (RET1, RET2) were characterized by using circular dichroism, ultraviolet visible spectroscopy and atomic force microscopy. Nobel metal nanocrystals were observed by transmission electron microscopy (TEM). It's indicated that the size distribution (1.86-3.88 nm or 1.80-8.41 nm) of the Pd/Ag nanocrystals is greatly dependent on the conformation of the DNA templates. Further these DNA-templated nobel metal nanoparticles show interesting catalytic performance for the reduction reaction of nitryl to amido. The i-motif-templated Pd/Ag nanocrystals show higher rate constants, 0.867 min^-1(6.64×10^-4 mM),0.338 min^-1(3.28×10^-3 mM) respectively.