Gold nanoisland arrays prepared by sputtering and bio-functionalization of their surfaces

Gold nanoisland arrays (Au NIA) were prepared by sputtering without masking and lithography and were investigated by local surface plasmonic resonance (LSPR) effect. Self-assembly of 11 mercaptoundecanoic acid (11-MUA) monolayers were used for bio-functionalization of Au surfaces because MUA improve...

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Published in2016 11th International Conference on Advanced Semiconductor Devices & Microsystems (ASDAM) pp. 125 - 128
Main Authors Szabo, O., Tvarozek, V., Kovacova, S., Novotny, I.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.11.2016
Subjects
Gold
Lithography
Plasmons
Self-assembly
Sensors
Sputtering
Surface waves
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Summary:Gold nanoisland arrays (Au NIA) were prepared by sputtering without masking and lithography and were investigated by local surface plasmonic resonance (LSPR) effect. Self-assembly of 11 mercaptoundecanoic acid (11-MUA) monolayers were used for bio-functionalization of Au surfaces because MUA improves an attachment of biomolecules (proteins, antibodies) to the surface of Au. Coverage of 11-MUA induced the blue or the red shift of LSPR wavelength depending on the Au NIA size (nominal thickness t). In accordance with the universal size-scaling model, smaller NIA structures with nominal thicknesses of 5 nm showed little blue shifts Δλ = -11 nm (Au NIA) and Δλ = - 13 nm (Au/Ti NIA). In the case of the thicker Au NIA (thickness of 16 nm) the refractive index-based sensing was dominant and the red shift of LSPR wavelength was observed Δλ = + 24 nm.
DOI:10.1109/ASDAM.2016.7805911