Substrate Effect on the Refractive Index Sensitivity of Silver Nanoparticles

E. Martinsson, M. A. Otte, M. Mehdi Shahjamali, B. Sepulveda and D. Aili

The Journal of Physical Chemistry C, 118 (42), 2014, 24680–24687 - DOI: 10.1021/jp5084086

http://pubs.acs.org/doi/abs/10.1021/jp5084086

Abstract: The bulk refractive index (RI) sensitivity of dispersed and immobilized silver nanoparticles of three different shapes (spheres, cubes, and plates) is investigated. We demonstrate, both experimentally and theoretically, that the in fluence of immobilization on the RI sensitivity is highly dependent on the shape of the nanoparticles. A strong correlation is seen between the fraction of the particle surface
area in direct contact with the substrate and the decrease in RI sensitivity when the particles are immobilized on a glass substrate. The largest decrease (36%) is seen for the most sensitive nanoparticles (plates), drastically reducing their advantage over other nanoparticle shapes. The shape-dependent substrate effect is thus an important factor to consider when designing nanoplasmonic sensors based on colloidal noble-metal nanoparticles

Substrate Effect on the Refractive Index Sensitivity of Silver Nanoparticles
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