Abstract
An explosion in the interest for nanoplasmonics has occurred in order to realize optical devices, biosensors, and photovoltaic devices. The plasmonic nanostructures are used for enhancing and confining the electric field. In the specific case of biosensing, this electric field confinement can induce the enhancement of the Raman signal of different molecules, or the localized surface plasmon resonance shift after the detection of analytes on plasmonic nanostructures. A major part of studies concerning to plasmonic modes and their application to sensing of analytes is realized in ambient environment. However, over the past decade, an emerging subject of nanoplasmonics has appeared, which is nanoplasmonics in high pressure environment. In last five years (2015–2020), the latest advances in this emerging field and its application to sensing were carried out. This short review is focused on the pressure effect on localized surface plasmon resonance of gold nanosystems, the supercrystal formation of plasmonic nanoparticles stimulated by high pressure, and the detection of molecules and phase transitions with plasmonic nanostructures in high pressure environment.
Highlights
A study reporting on the effect of high pressure on the localized surface plasmon resonance (LSPR) shift of colloidal gold nanoparticles demonstrated that the LSPR redshift of Au nanoparticles in water was due to the linear increasing of the refractive index of the water with pressure [73]
We spoke about the effect of high pressure on the localized surface plasmon resonance and the optical density of gold nanoparticles with different shapes and sizes
LSPR shifts were observed for gold nanoparticles and were dependent on the shape, size, pressure regime, and surrounding medium
Summary
Nanoplasmonics was employed for the production of photovoltaic devices [1,2,3,4,5,6], optical devices [7,8,9,10,11,12,13,14,15], and biosensors [16,17,18,19,20]. Concerning to the application to plasmonic biosensing, this EM field confinement allowed inducing an enhancement of Raman signal of analytes named surface enhanced Raman scattering (SERS) [48,49,50,51,52,53] or the localized surface plasmon resonance (LSPR) shift after detection of analytes on plasmonic nanostructures [54,55,56,57,58]. A study reporting on the effect of high pressure on the LSPR shift of colloidal gold nanoparticles demonstrated that the LSPR redshift of Au nanoparticles in water was due to the linear increasing of the refractive index of the water with pressure [73] The aim of this short review is to discuss the latest advances on nanoplasmonics in high pressure environment over the period 2015–2020. We will present the pressure effect on localized surface plasmon resonance of gold nanosystems, the use of high pressures for the supercrystal formation of gold nanoparticles, and finish the detection of molecules and phase transitions with plasmonic nanostructures in high pressure environment
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