Berlin 2018 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 31: Poster Session II

DS 31.16: Poster

Donnerstag, 15. März 2018, 11:15–13:15, Poster F

Surface plasmon resonance investigation of gold nanoparticle aggregation on self-assembled monolayers — •Navid Khangholi, Alfred Kick, Mathias Lakatos, and Michael Mertig — Technische Universität Dresden, Dresden, Germany

A new sensor principle based on Surface Plasmon Resonance is developed using AuNPs functionalised with carboxylic groups (AuNP-COOH) immobilised on self-assembled monolayers (SAM). The immobilisation of AuNP-COOHs occurs electrostatically between a positively charged SAM and negatively charged AuNP-COOHs. This SAM consists of a thiolated pH-sensitive polymer, poly (2-vinylpyridine) with a terminal thiol group (P2VP-SH), as a supporting layer on the gold surface of the SPR chip. This polymer responds to the pH changes, e.g. swelling and shrinking in acidic or basic environments, respectively. Swelling of P2VP with AuNP-COOHs occurs between pH 2.3 and 1.7. This induces an enhanced decrease of the SPR signal compared to the P2VP layers without AuNPs. This larger decrease of the SPR signal is due to the increase of the distance between the AuNPs and the gold substrate.