Substrate Effect on the Refractive Index Sensitivity of Silver Nanoparticles

Martinsson, ErikLinköpings universitet,Molekylär fysik,Tekniska högskolan (författare)

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.

Otte, Marinus A.Institut Catala de Nanociencia i Nanotecnologia (ICN2), Consejo Superior de Investigaciones Cientificas (CSIC) & CIBER-BBN, Campus UAB, Bellaterra, Barcelona, Spain (författare)
Shahjamali, Mohammad M.Northwestern University, Evanston, Illinois, USA (författare)
Sepulveda, BorjaInstitut Catala de Nanociencia i Nanotecnologia (ICN2), Consejo Superior de Investigaciones Cientificas (CSIC) & CIBER-BBN, Campus UAB, Bellaterra, Barcelona, Spain (författare)
Aili, DanielLinköpings universitet,Molekylär fysik,Tekniska högskolan(Swepub:liu)danai11 (författare)
Linköpings universitetMolekylär fysik (creator_code:org_t)

Ingår i:The Journal of Physical Chemistry C: American Chemical Society (ACS)118:42, s. 24680-246871932-74471932-7455

Av författaren/redakt...: Martinsson, Erik; Otte, Marinus A.; Shahjamali, Moha ...; Sepulveda, Borja; Aili, Daniel

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