JACS: the research team of Professor Feng Yuhua and Professor Chen Hongyu of Nanjing University of Technology prepared hexagonal silver nanoflakes with ultra narrow linear gaps

As a highly sensitive analytical method, surface enhanced Raman spectroscopy has important applications in biology, environment and public safety In general, the ultra narrow gap in gold, silver and other nanostructures has a significant enhancement effect on the Raman spectrum However, the ultra narrow gap prepared by the traditional method is generally a closed structure, which can not be used in the actual detection and analysis; or because the effective region is small, the enhancement effect for the Raman spectrum is limited, which greatly limits its application in the actual detection Recently, Professor Feng Yuhua and Professor Chen Hongyu from the school of chemistry and molecular engineering of Nanjing University of technology have obtained hexagonal silver nanostructures with an open ultra narrow linear gap (about 90 nm in length and 2 nm in width) through seed mediated growth In this method, the core-shell nanoparticles coated with silver nanoparticles by polystyrene polyacrylic acid (pspaa) double block polymer are used as seeds The growth of silver nanoparticles starts from a point on the surface of the silver seeds in the polymer shell and extends along the surface of the polymer to both sides When they meet, they cannot fuse, forming an open ultra narrow and ultra long linear gap The sensitivity of the nano structure in SERS detection is very high, and the detection limit of 2-naphthylmercaptan is 10-9m Relevant research results were published on J am Chem SOC Under the title of "construction of long narrow gaps in Ag nanoplates" (DOI: 10.1021 / JACS 8b06969) Jiang Tao (visiting scholar of Nanjing University of Technology) of Ningbo University is the first author, and Professor Feng Yuhua and Professor Chen Hongyu are co correspondents.