Abstract
In this study, we report on the fabrication of nanoassemblies composed by Au and bimetallic core–shell Au@Ag nanorods immobilized onto pH-responsive poly(2-vinylpyridine) (P2VP) brushes. The general process includes the synthesis of gold nanorods (through the seed mediated method) and a subsequent reduction of AgNO3 on the gold surface. These colloidal particles were immobilized onto carboxy-terminated P2VP brushes (COOH-P2VP), previously grafted on underlying substrates (silicon wafers and glass slides). UV–vis spectroscopy and transmission electron microscopy (TEM) images confirmed the morphology of the gold nanorods and the core–shell structure of the bimetallic Au@Ag nanorods. The presence of metal nanoparticles on the P2VP-functionalized substrates was demonstrated by atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM) images. The swelling–deswelling behavior of the pH responsive polymer brushes was confirmed using UV–vis spectroscopy over P2V...
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