Tri-sodium citrate stabilized gold nanocubes for plasmonic glucose sensing

in: Materials Letters (2021)
Singh, Chandan; Thiele, Matthias; Dathe, André; Thamm, Sophie; Henkel, Thomas; Sumana, Gajjala; Fritzsche, Wolfgang; Csáki, Andrea
We report a two-step process for the immobilization of gold nanocubes (Au-NCs) on a glass surface using a combination of extraction and exchange reaction using poly (sodium 4-styrenesulfonate) (PSS) and trisodium citrate (TSC). Cetyltrimethylammonium chloride (CTAC) stabilized gold nanocubes (CTAC/Au-NCs) synthesized by a microfluidic synthesis procedure were successfully deposited on silane-modified glass substrate after extraction of excess CTAC using chloroform followed by exchange of CTAC to TSC on the surface of Au-NCs. Further, TSC/Au-NCs were found to be highly stable and suitable for microfluidic sensing of different glucose concentrations using localized surface plasmon resonance (LSPR) spectroscopy offering an improved sensitivity (126.37 nm/RIU).

DOI: Array

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