Hyperbranched Poly acrylic Acid Graft Synthesis on Gold Surfaces

Hyperbranched Poly(acrylic Acid) Graft Synthesis on Gold Surfaces 

The use of appropriate functionalized oligomers is a key to the success of this synthesis. The necessary functionalized oligomers were prepared by polymerization of ferf-butyl acrylate (n = ca. 120) with a functional AIBN initiator (Eq. 1). Since 

Tapping-mode atomic force microscopy studies showed that as these hyperbranched PAA films became somewhat less smooth as they increased in thickness through successive grafting stages [24]. For example, a very smooth initial single-crystal Au(lll) surface with a root mean square (RMS) roughness of 0.2 nm (over a 2 xm x 2 im area) had its roughness increased to 

Hydrophobic, fluorinated hyperbranched grafts were synthesized from an ethyl chloroformate activated hyperbranched 3-PAA/Au graft using the fluorinated alkyl amine H2N(CH2)(CF2)6CF3. Reaction of an activated 3-PAA/Au film with H2N(CH2 ) (CF2 leCFs produced a fluorinated film that almost doubled in thickness. XPS analysis showed 46 atom-% F in the product fluoramidated graft which is 86% of the theoretical atomic concentration for a homogenous 

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