A unique method of fabricating PS/AuNPs composite particles in ex situ mode is proposed on
the basis of thermodynamically driving mechanism. It is facile and versatile as it eliminates
the need for surface functionalizations and modifications of both PS microspheres and AuNPs.
The PS/AuNPs composite particles take on a raspberry-like
morphology with controllable coverage according to some
thermodynamic factors, which have been extensively characterized by scanning electron microscopy, transmission
electron microscopy, and thermogravimetric analysis. More
importantly, the PS/AuNPs composite particles hold higher
catalytic efficiency and better repeatability than the previously reported results, which are confirmed in two oxidation–
reduction reactions of 2-nitroaniline/NaBH
4
and rhodamine
B/NaBH 4
.