Measurement of the localised plasmon penetration depth for gold nanoparticles using a non-invasive bio-stacking method

Literature Information

Publication Date 2013-03-08
DOI 10.1039/C3CP50758K
Impact Factor 3.676
Authors

Thomas Read, Rouslan V. Olkhov, Andrew M. Shaw


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Abstract

We have used the formation of a bio-probe stack with up to 24 steps on gold nanoparticle and continuous gold surfaces to characterize the penetration depth of the plasmon field in a non-invasive manner by only involving biomolecules from standard bio-assays. An alternating anti-goat rabbit IgG and anti-rabbit IgG bio-probe stack is polymerized on protein A/G functionalized gold surfaces. The change in plasmon excitation angle or light scattering decreases exponentially with each stacking step although the bio-integrity of the antibody epitope is maintained. The exponential decay in the derived kinetic parameters is attributed to the change in the penetration depth and the step size is calibrated using a commercial continuous gold surface plasmon resonance surface to be 17.5 ± 0.8 nm, consistent with the expected dimension of the antibody. The penetration depth of the gold spherical nanoparticles of diameter 90 ± 13 nm is determined to be 93 ± 10 nm.

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