Article history: Two kinds of ternary hybrids were prepared by anchoring different shapes and loadings of Au nanopar- Received 27 November 2015 ticles (NPs) on poly(dopamine) (PDA) functionalized polystyrene (PS) microspheres with two different Received in revised form 13 January 2016 strategies, i.e., in situ reduction and self-assembly approach. PDA coatings were ﬁrstly introduced to Accepted 1 February 2016 functionalize the hydrophobic PS surface with sufﬁcient amino and hydroxyl groups, which enhanced Available online 3 February 2016 the interaction between Au NPs and the polymer spheres. Thus, Au NPs could be easily immobilized onto the surface of the PDA/PS microspheres, and the hierarchical composite microspheres exhibited Keywords: a well-deﬁned core/shell structure without sacriﬁcing the spherical PS morphology. PS/PDA/Au-R and Au nanoparticles PS/PDA/Au-A microspheres fabricated by in situ reduction and self-assembly approach showed different Polydopamine distinct Au nano-shell morphology with the corresponding optical, catalytic and electrochemical proper- Core–shell conducting spheres ties. Field emission scanning electron microscopy and transmission electronic microscopy veriﬁed these Polymer microsphere hierarchical structures with the ultrathin PDA ﬁlm incorporating between the inner PS core and the outer Au NPs shell. X-ray diffraction and X-ray photoelectron spectroscopy conﬁrmed the presence of PDA and Au layer on the surface
Applied Surface Science – Elsevier
Published: Apr 30, 2016
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