| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 7147334 | Sensors and Actuators B: Chemical | 2014 | 6 Pages |
Abstract
This work focused on the plasmonic sensitivity of a substrate composed of gold nanoparticles (AuNp) and 3-aminopropyltriethoxysilane (APTES)-modified graphene oxide (GO-APTES). The multilayered system fabricated by dip-coating was analyzed by means of FTIR spectroscopy and scanning electron microscopy (SEM). The localized surface plasmon resonance (LSPR) band of AuNp was shifted from ca. 520Â nm (monolayer of AuNp) to ca. 600Â nm (multilayered with GO), which was a result of the agglomeration of AuNp. SEM micrographies revealed a system containing agglomerated grapheme oxide sheets on the substrate. An unprecedented sensitivity profile, determined in different refractive index (RI) media, was ca. 460Â nm/RIU. The bio-sensitivity of the substrate was evaluated by immobilization of BSA on MUA-NHS-treated Au/GO, which presented a shift of 2.07Â nm after binding to the protein.
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Authors
Cleiser T.P. da Silva, Johny P. Monteiro, Eduardo Radovanovic, Emerson M. Girotto,