scholarly journals Double-exponential refractive index sensitivity of metal–semiconductor core–shell nanoparticles: the effects of dual-plasmon resonances and red-shift

RSC Advances ◽  
2018 ◽  
Vol 8 (3) ◽  
pp. 1700-1705 ◽  
Author(s):  
Hailong Zhang ◽  
Pengfei Cao ◽  
Jie Dou ◽  
Lin Cheng ◽  
Tiaoming Niu ◽  
...  
Keyword(s):  
Refractive Index ◽  
Red Shift ◽  
Localized Surface Plasmon ◽  
Core Shell ◽  
Refractive Index Sensitivity ◽  
Shell Nanoparticles ◽  
Double Exponential ◽  
New Type ◽  
Index Sensitivity ◽  
Core Shell Nanoparticles

We present a new type of localized surface plasmon resonance (LSPR) sensor whose refractive index sensitivity can be improved by greatly increasing the plasmon wavelength red-shift of metal–semiconductor core–shell nanoparticles (CSNs).

Facile one-pot photosynthesis of stable Ag@graphene oxide nanocolloid core@shell nanoparticles with sustainable localized surface plasmon resonance properties

2017 ◽  
Vol 5 (38) ◽  
pp. 10016-10022 ◽  
Author(s):  
Young-Kwan Kim ◽  
Seongchan Kim ◽  
Sung-Pyo Cho ◽  
Hongje Jang ◽  
Hyun Huh ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Surface Plasmon Resonance ◽  
Photochemical Reaction ◽  
Localized Surface Plasmon Resonance ◽  
Localized Surface Plasmon ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
One Pot ◽  
Resonance Properties ◽  
Core Shell Nanoparticles

Stable Ag@graphene oxide nanocolloid (GON) core–shell nanoparticles were synthesized by photochemical reaction.

Extinction Coefficient of Plasmonic Nickel Sulfide Nanocrystals and Gold-Nickel Sulfide Core-Shell Nanoparticles

2018 ◽  
Vol 233 (1) ◽  
pp. 3-14 ◽  
Author(s):  
Rasmus Himstedt ◽  
Dominik Hinrichs ◽  
Dirk Dorfs
Keyword(s):  
Extinction Coefficient ◽  
Nickel Sulfide ◽  
Molar Extinction Coefficient ◽  
Localized Surface Plasmon ◽  
Core Shell ◽  
Electromagnetic Spectrum ◽  
Shell Nanoparticles ◽  
Extinction Coefficients ◽  
Optical Applications ◽  
Core Shell Nanoparticles

Abstract In the presented work, the molar extinction coefficient of plasmonic heazlewoodite (Ni3S2) nanoparticles and Au-Ni3S2 core-shell nanoparticles is determined for the first time. The results are compared to analogously determined extinction coefficients of pure Au nanocrystals (NCs), which themselves correlate very well with existing literature on the subject. The measured extinction coefficients at the localized surface plasmon resonance (LSPR) maximum wavelength of nickel sulfide particles are similar to the values of equally sized Au NCs. Therefore, considering the lower cost of the heazlewoodite material, it could be a reasonable alternative for optical applications of nanoparticles showing a LSPR in the visible regime of the electromagnetic spectrum. Furthermore, this study shows, that by growing a Ni3S2 shell onto a pure Au nanocrystal a highly tuneable optical material with variable LSPR frequency and molar extinction coefficient is obtained.

Nano-thick-dielectric encapsulation effects on the refractive index sensitivities of Ag plane-nanosphere-cluster sensors

2018 ◽  
Vol 32 (08) ◽  
pp. 1850080 ◽  
Author(s):  
Chao Ling Du ◽  
Wan Chun Yang ◽  
Sheng Peng ◽  
Da Ning Shi
Keyword(s):  
Refractive Index ◽  
Localized Surface Plasmon ◽  
Great Promise ◽  
Sers Substrate ◽  
Refractive Index Sensitivity ◽  
Surface Enhanced Raman ◽  
Equilateral Triangles ◽  
Quadratic Response ◽  
The Stability ◽  
Index Sensitivity

The nano-thick-dielectric encapsulation effects on the bulk and local refractive index sensitivity behaviors of Ag plane-nanosphere-cluster sensors (including nanosphere monomers, dimers, trimer chains and trimer equilateral triangles, four kinds of normally encountered nanoparticles in experiments) have been numerically investigated by finite element method (FEM). The encapsulation is revealed to decrease the quadratic magnitude of the refractive index responses of their peak wavelengths of localized surface plasmon resonances (LSPR), while it does not violate such quadratic response natures. Its effect on their capabilities of surface enhanced Raman scattering (SERS) behaviors is discussed too. It is demonstrated to provide an efficient type of SERS substrate for plasmonic sensing and detections, which improves the stability of the concerned nanoparticles, and not diminish their SERS signals, in agreement well with experiments under the same nanostructure parameters. This work holds great promise for further designing SERS-based sensing/detecting substrates and sensors/detectors.

scholarly journals Plasmonic coupling in Au, Ag and Al nanosphere homo-dimers for sensing and SERS

2018 ◽  
Vol 7 (2) ◽  
pp. 83-90 ◽  
Author(s):  
J. Katyal
Keyword(s):  
Refractive Index ◽  
Near Field ◽  
Visible Region ◽  
Field Enhancement ◽  
Interparticle Spacing ◽  
Localized Surface Plasmon ◽  
Refractive Index Sensitivity ◽  
Plasmonic Material ◽  
Sensing Applications ◽  
Index Sensitivity

The localized surface plasmon resonance of homo-dimer nanostructures is studied using FDTD simulations. The calculated LSPR wavelength of Au, Ag and Al nanosphere forming a homo-dimer configuration is compared and the results reveal a larger LSPR shift in Ag and Al homo-dimer than in Au homo-dimer. Taking the sensitivity of LSPR shape to the size and interparticle spacing of nanoparticle along with a surrounding refractive index, parameters like refractive index sensitivity have been determined. The spherical homo-dimer over the whole range of particle size, studied here shows the index sensitivity order as Ag>Al>Au. Hence, the use of plasmonic material towards the refractive index sensing applications is useful in this order.  The average refractive index sensitivities of Ag, Al and Au are 287.09 nm/RIU, 210.21 nm/RIU and 192.47 nm/RIU in DUV-Visible-NIR region. Apart from LSPR shift, the highly confined near-field intensity enhancement of homo-dimer nanostructures for SERS has also been studied. The interacting homo-dimer nanoparticles reveals intensity enhancements in the junction. Comparing the field enhancement for Au, Ag and Al homo-dimer nanostructure 10^8-10^9  have been theoretically predicted in DUV-UV-visible region which can be used to strongly enhance the Raman scattering of molecules.

scholarly journals Refractive index sensitivity of Au nanostructures in solution and on the substrate

2021 ◽  
Author(s):  
Hemant Ramakant Hegde ◽  
Santhosh Chidangil ◽  
Rajeev K. Sinha
Keyword(s):  
Refractive Index ◽  
Colloidal Solution ◽  
Synthesis Method ◽  
Peak Position ◽  
Localized Surface Plasmon ◽  
Surface Immobilization ◽  
Refractive Index Sensitivity ◽  
Sensing Applications ◽  
Sensing Platforms ◽  
Index Sensitivity

AbstractIn this work, we present the synthesis and surface immobilization of Au nanostars, Au nanocubes and Au nanorods for localized surface plasmon resonance (LSPR)-based refractometric sensing applications. Au nanostructures exhibiting LSPR peak positions in 500–900 nm spectral range were prepared by seed-mediated synthesis method. The refractive index (RI) sensitivity of all these nanostructures in the colloidal solution were measured and the sample exhibiting highest sensitivity in each category were immobilized on the glass substrate. The surface immobilized nanostructures were investigated for RI sensing. Au nanostars having LSPR peak position at 767 nm exhibited highest RI sensitivity of 484 nm/RIU in solution and 318 nm/RIU on the substrate. This study gives an outline for selecting the Au nanostructures for developing plasmonic sensing platforms.

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