Abstract:

The high throughout and cost-effective fabrication strategy of raspberry-like Au-Resin microspheres, with the anion exchange resin microsphere as the inner core and the monolayer array of micro-sized Au posts as the outer shell, was achieved by the reduction reaction of AuCl₄^--Resin by ascorbic acid in aqueous solutions. The formation of Au micro-sized posts and the corresponding array were simultaneously obtained in a single step. The performance of surface enhanced Raman scattering(SERS) for the raspberry-like Au-Resin microspheres was explored using benzenethiol as the probe. The SERS enhanced factor(EF) is in the range of 10⁸-10⁹ orders of magnitude, the relative standard deviation(RSD) of both Raman intensity and EF is about (35±5)%, which indicates that the raspberry-like Au-Resin microspheres can be used as the excellent SERS active substrates with high reproducibility and stability.

Key words: Raspberry-like Au-Resin microsphere, Arrays of Au micro-sized post, SERS active substrate