Substrate Effect on the Refractive Index Sensitivity of Silver Nanoparticles

Citations Over TimeTop 10% of 2014 papers

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 influence 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.

Related Papers

• → On the slow motion of two spheres in contact along their line of centres through a viscous fluid(1969)64 cited
• → Interaction between large spheres immersed in small spheres: remarkable effects due to a trace amount of medium-sized spheres(2002)27 cited
• → Numerical Simulation of Flows Past Two Spheres (II) -Two Spheres Arbitrarily Positioned-(2005)
• → Compact packings of space with three sizes of spheres(2019)
• → Two Charged Spheres(2021)