Localized Surface Plasmon Resonance Dependence on Misaligned Truncated Ag Nanoprism Dimer

Abstract

Misaligned edge-to-edge dimers are the common products during the preparation of Ag nanoprism dimers using self-assembly method. However, in the self-assembly method, Ag nanoprisms are easily truncated because they are easy to oxidize in an acidic environment. In this work, modeling a truncated Ag nanoprism on a misaligned edge-to-edge dimer provides a better understanding of the effects of the truncation and misalignment on localized surface plasmon resonance (LSPR) of the dimer. The resonant wavelength and intensity of the dimer are flexibly modulated by changing the misalignment length of the dimer. As the misalignment length increases, a stronger peak at the shorter wavelength and a weaker one at the longer wavelength are observed. The resonant wavelengths and intensities of the two peaks are also flexibly tuned by adjusting the truncated length of the Ag nanoprism in the dimer. The results are numerically demonstrated based on the finite element method (FEM) and show promising potential for nanoswitch, multi-channel tunable biosensor and other nanodevice applications.

Tip-Enhanced Raman Imaging of Photocatalytic Processes at the Nanoscale

“…Thus, the Stark shift can be used to quantify the strength of rectified electric field on the surface of AuNPs. , The reported results by Li and co-workers confirmed that edges and corners of AuNPs exhibited greater, on average, intensity of the rectified electric field than the central parts of the nanostructures . Similar conclusions were independently made by the El-Khoury group that utilized TERS to examine photocatalytic properties of Ag nanoparticles (AgNPs) and Ag nanowires (AgNWs). , Researchers found that the rectified electric field was stronger at the edges and corners of NMNS in that at their flat terraces. , On the basis of these findings, one can conclude that catalytic reactivity of the NMNS is determined by the intensity of the rectified electric field on their surfaces.…”

“…62,63 Researchers found that the rectified electric field was stronger at the edges and corners of NMNS in that at their flat terraces. 64,65 On the basis of these findings, one can conclude that catalytic reactivity of the NMNS is determined by the intensity of the rectified electric field on their surfaces.…”

Nanoscale structural characterization of plasmon-driven reactions

“…El-Khoury's group employed TERS to probe spatial variations in intensities of optical fields on the surface of Ag nanoparticles (AgNPs) and Ag nanowires (AgNWs) [92,93]. The electric field was found to be higher at the edges and corners of these AgNPs and AgNWs comparing to their terraces [94,95]. These finding suggests that the strength of the electric field can determine catalytic activity of nanostructures.…”

Dynamic Trapping and Manipulation of Self-Assembled Ag Nanoplates as Efficient Plasmonic Tweezers

“…In this regard, chemical growth techniques can offer a solution by enabling the preparation of nanostructures over large areas with high quality and scalability. , Self-assembled nanostructures produced through chemical growth and self-assembly techniques can be linked and form gap-enhanced hotspot modes, leading to the localization of plasmons in the diagonal gap region. − Moreover, metal nanoplates with higher structural anisotropy localize the plasmon to the diagonal gap region quadratically, enhancing the amplitude of the electric field . By utilizing these self-assembled nanostructures, multiple trapping sites in a large area can be created for POTs, providing a wider space for stable trapping and manipulation of particles.…”