Investigation of the structure of iron oxide nanoparticle assemblies in order to optimize the sensitivity of surface plasmon resonance-based sensors

Synthesis of gallotannin capped iron oxide nanoparticles and their broad spectrum biological applications

“…The black coloration of the solution could be explained due to the collective oscillation of electrons in the conduction band of zero-valent iron (Fe 0 ) which is known as surface plasmon resonance (SPR). 42 The EDX spectroscopic analysis of GT-Fe 2 O 3 nanoparticles showed the percentage of iron (Fe) and oxygen (O) as 21.7% and 42.11%, respectively ( Fig. 2B ).…”

Chemical design of high performance SPR biosensor based on a dielectric nanoparticle assembly supported onto a gold thin film

“…12,13 In contrast to continuous thin films, the structure of nanoparticle assemblies can be modulated according to different structural parameters, such as nanoparticle size and density, which allow adjustment of the optical properties, as we have shown by using high refractive index Fe 3-δ O 4 nanoparticles (n = 2.42). 14 A high loading of nanoparticles significantly enhances the intensity of the electromagnetic field, i.e. the sensitivity of plasmonic thin films.…”

“…The main interest of nanoparticle assemblies supported on plasmonic metal thin films is certainly the ability to finely tune their structure in order to address the interplay between the highest loading of nanoparticles and the highest accessibility of binding sites. 14 Besides the optimization of the optical properties, the surface functionalization of nanoparticle assemblies is also a critical parameter. Considering that analytes to be detected are present at a low concentration in bodily fluids which are very complex mixtures, nonspecific interaction is one of the main limitations of sensor efficiency.…”

Latest Novelties on Plasmonic and Non-Plasmonic Nanomaterials for SERS Sensing

“…The strong development of plasmonic nanomaterials for various applications such as photovoltaics [ 1 , 2 , 3 , 4 ], optical devices [ 5 , 6 , 7 , 8 , 9 , 10 ], and biochemical sensors [ 11 , 12 , 13 , 14 , 15 , 16 , 17 ] has taken place over these last ten years. The plasmonic nanostructures can also enable the detection of phase transitions under high-pressure conditions [ 18 ], the luminescence upconversion enhancement [ 19 , 20 ], and the optical tuning of photoluminescence [ 21 ] and upconversion luminescence [ 22 ].…”