Functionalized gold surfaces with hyperbranched polyglycerols. Studies of Application

JULIETA I. PAEZ; MIRIAM C. STRUMIA; RAINER HAAG

San José

Simposio; SLAP 2010. XII SIMPOSIO LATINOAMERICANO DE POLÍMEROS, X CONGRESO IBEROAMERICANO DE POLÍMEROS, I CONGRESO NACIONAL DE POLÍMEROS, I CONGRESO CENTROAMERICANO DE NANOTECNOCIENCIA, I CONGRESO NACIONAL DE NANOTECNOCIENCIA.; 2010

LANOTEC. Laboratorio Nacional de Nanotecnología. Costa Rica

The less structurally perfect, hyperbranched polymers, synthesized via one-step reactions have been considered as a possible alternative to dendrimers, since structural perfection is not a strict prerequisite for most applications (1). In particular, hyperbranched polyglycerols (hPG) are available on a large scale and have relatively low polydispersities (2). Nanostructures arising from the combination of hPG with different kind of surfaces have been used for many applications such as catalysis (3), dye solar cell construction (4) or protein resistant surfaces development (5).Herein, we present functionalized gold surfaces using self-assembled hPG. The first synthetic stage in our approach consists of a controlled introduction of amino and disulfide groups on hPG, in order to obtain structures capable to be attached on gold surfaces by a self-assembling process (Figure 1). Hyperbranched PG (5 kDa) with ca. one disulfide group and different percentages (0, 6.5, 9, and 14 %) of amino groups per hyperbranched molecule were synthesized (6). Secondly, the attachment of modified-hPG to gold surfaces was achieved following the normal overnight dipping procedure of a gold slide in 1 mM DMF solution of each compound. Afterwards, the modified surfaces were characterized by spectroscopic and optical techniques. The effect of the amount of amino groups exerts over the properties of the hPG-functionalized gold surfaces was specially analyzed.