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High-Performance Biosensing Using Arrays of Plasmonic Nanotubes

J. McPhillips ; A. Murphy ; Magnus Jonsson (Institutionen för teknisk fysik, Biologisk fysik) ; W. R. Hendren ; R. Atkinson ; Fredrik Höök (Institutionen för teknisk fysik, Biologisk fysik) ; A. V. Zayats ; R. J. Pollard
Acs Nano (1936-0851). Vol. 4 (2010), 4, p. 2210-2216.
[Artikel, refereegranskad vetenskaplig]

We show that aligned gold nanotube arrays capable of supporting plasmonic resonances can be used as high performance refractive index sensors in biomolecular binding reactions. A methodology to examine the sensing ability of the inside and outside walls of the nanotube structures is presented. The sensitivity of the plasmonic nanotubes is found to increase as the nanotube walls are exposed, and the sensing characteristic of the inside and outside walls is shown to be different. Finite element simulations showed good qualitative agreement with the observed behavior. Free standing gold nanotubes displayed bulk sensitivities in the region of 250 nm per refractive index unit and a signal-to-noise ratio better than 1000 upon protein binding which is highly competitive with state-of-the-art label-free sensors.

Nyckelord: gold nanotubes, array, LSPR, label-free biosensing, plasmonic, metamaterial, finite element simulation, COLLOIDAL LITHOGRAPHY, GOLD, RESONANCE, SENSITIVITY, NANORODS, ELECTRODEPOSITION, POLYPYRROLE, SENSORS, SINGLE, GROWTH

Denna post skapades 2010-08-10.
CPL Pubid: 124323


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Institutioner (Chalmers)

Institutionen för teknisk fysik, Biologisk fysik (2007-2015)



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