高能非正二十面体金纳米晶及SERS催化性能研究

In this paper, a brand new gold nanocrystal, atypical icosahedra enclosed by {110}, {113} and {111} facets with many irrational kinks, has been firstly prepared by a simple modified seed-mediated method. Compared with smaller-sized Au nanospheres, the icosahedra nanostructures exhibit much higher catalytic activity than Au nanospheres in the SERS in-situ autocatalytic reaction when converting p-Aminothiophenol (PATP) to p, p′-dimercaptoazobenzene (DMAB). A large density of irrational kinks and step atoms are observed on the surfaces of icosahedral Au nanocrystals, endowing with more active reaction sites. The surface energies of {110} and {113} facets have been calculated based on density functional theory (DFT) to explain the catalytic activities for Au icosahedra nanocrystals.