scholarly journals Metal-Dielectric-Graphene Hybrid Heterostructures with Enhanced Surface Plasmon Resonance Sensitivity Based on Amplitude and Phase Measurements

Plasmonics ◽  
2022 ◽  
Author(s):  
Vasyl G. Kravets ◽  
Fan Wu ◽  
Tongcheng Yu ◽  
Alexander N. Grigorenko
Keyword(s):  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Noble Metals ◽  
Near Infrared ◽  
Strong Electric Field ◽  
Phase Changes ◽  
Oxide Semiconductor ◽  
Spectral Position ◽  
Graphene Layers

AbstractMetal-dielectric-graphene hybrid heterostructures based on oxides Al2O3, HfO2, and ZrO2 as well as on complementary metal–oxide–semiconductor compatible dielectric Si3N4 covering plasmonic metals Cu and Ag have been fabricated and studied. We show that the characteristics of these heterostructures are important for surface plasmon resonance biosensing (such as minimum reflectivity, sharp phase changes, resonance full width at half minimum and resonance sensitivity to refractive index unit (RIU) changes) can be significantly improved by adding dielectric/graphene layers. We demonstrate maximum plasmon resonance spectral sensitivity of more than 30,000 nm/RIU for Cu/Al2O3 (ZrO2, Si3N4), Ag/Si3N4 bilayers and Cu/dielectric/graphene three-layers for near-infrared wavelengths. The sensitivities of the fabricated heterostructures were ~ 5–8 times higher than those of bare Cu or Ag thin films. We also found that the width of the plasmon resonance reflectivity curves can be reduced by adding dielectric/graphene layers. An unexpected blueshift of the plasmon resonance spectral position was observed after covering noble metals with high-index dielectric/graphene heterostructures. We suggest that the observed blueshift and a large enhancement of surface plasmon resonance sensitivity in metal-dielectric-graphene hybrid heterostructures are produced by stationary surface dipoles which generate a strong electric field concentrated at the very thin top dielectric/graphene layer.

Facile synthesis of urchin-like LaWO4Cl assemblies and their near-infrared photothermal conversion

Nanoscale ◽  
2019 ◽  
Vol 11 (30) ◽  
pp. 14237-14241 ◽  
Author(s):  
Lin Sun ◽  
Yang Shi ◽  
Mingcong Tang ◽  
Dong Wang ◽  
Yaping Tian ◽  
...  
Keyword(s):  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Localized Surface Plasmon Resonance ◽  
Near Infrared ◽  
Localized Surface Plasmon ◽  
Facile Synthesis ◽  
Photothermal Conversion ◽  
Conversion Performance

The hierarchical urchin-like LaWO4Cl assemblies promote the photothermal conversion performance due to the localized surface plasmon resonance.

scholarly journals Noble Metal-Assisted Surface Plasmon Resonance Immunosensors

Sensors ◽  
2020 ◽  
Vol 20 (4) ◽  
pp. 1003 ◽  
Author(s):  
Jin-Ha Choi ◽  
Jin-Ho Lee ◽  
Joohyung Son ◽  
Jeong-Woo Choi
Keyword(s):  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Noble Metals ◽  
Specific Antigen ◽  
High Sensitivity ◽  
Enzyme Linked Immunosorbent Assay ◽  
Protein Biomarkers ◽  
Detection Probe ◽  
Inducing Factors

For the early diagnosis of several diseases, various biomarkers have been discovered and utilized through the measurement of concentrations in body fluids such as blood, urine, and saliva. The most representative analytical method for biomarker detection is an immunosensor, which exploits the specific antigen-antibody immunoreaction. Among diverse analytical methods, surface plasmon resonance (SPR)-based immunosensors are emerging as a potential detection platform due to high sensitivity, selectivity, and intuitive features. Particularly, SPR-based immunosensors could detect biomarkers without labeling of a specific detection probe, as typical immunosensors such as enzyme-linked immunosorbent assay (ELISA) use enzymes like horseradish peroxidase (HRP). In this review, SPR-based immunosensors utilizing noble metals such as Au and Ag as SPR-inducing factors for the measurement of different types of protein biomarkers, including viruses, microbes, and extracellular vesicles (EV), are briefly introduced.

scholarly journals Palladium nanoparticles anchored to anatase TiO2 for enhanced surface plasmon resonance-stimulated, visible-light-driven photocatalytic activity

2015 ◽  
Vol 6 ◽  
pp. 428-437 ◽  
Author(s):  
Kah Hon Leong ◽  
Hong Ye Chu ◽  
Shaliza Ibrahim ◽  
Pichiah Saravanan
Keyword(s):  
Electron Microscopy ◽  
Photocatalytic Activity ◽  
Surface Plasmon Resonance ◽  
Visible Light ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Palladium Nanoparticles ◽  
Noble Metals ◽  
Visible Region ◽  
Bet Surface Area

Freely assembled palladium nanoparticles (Pd NPs) on titania (TiO2) nano photocatalysts were successfully synthesized through a photodeposition method using natural sunlight. This synthesized heterogeneous photocatalyst (Pd/TiO2) was characterized through field emission scanning electron microscopy (FESEM), high resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), BET surface area, UV–vis diffuse reflectance spectra (UV-DRS), Raman and photoluminescence (PL) analyses. The simple and smart synthesis anchored well the deposition with controlled Pd NPs size ranging between 17 and 29 nm onto the surface of TiO2. Thus, it gives the characteristic for Pd NPs to absorb light in the visible region obtained through localized surface plasmon resonance (LSPRs). Apparently, the photocatalytic activity of the prepared photocatalysts was evaluated by degrading the endocrine disrupting compound (EDC) amoxicillin (AMX) excited under an artificial visible light source. In the preliminary run, almost complete degradation (97.5%) was achieved in 5 h with 0.5 wt % Pd loading and the degradation followed pseudo-first-order kinetics. The reusability trend proved the photostability of the prepared photocatalysts. Hence, the study provides a new insight about the modification of TiO2 with noble metals in order to enhance the absorption in the visible-light region for superior photocatalytic performance.

Sign in / Sign up

Export Citation Format

Share Document