scholarly journals Hierarchically Structured Plasmonic Nanoparticle Assemblies with Dual-Length Scale Electromagnetic Hot Spots for Enhanced Sensitivity in the Detection of (Bio)Molecular Analytes

2021 ◽  
Vol 125 (16) ◽  
pp. 8647-8655
Author(s):  
Rishabh Rastogi ◽  
Ekoue A. Dogbe Foli ◽  
Remi Vincent ◽  
Suresh Poovathingal ◽  
Pierre-Michel Adam ◽  
...  
Keyword(s):  
Hot Spots ◽  
Length Scale ◽  
Plasmonic Nanoparticle ◽  
Nanoparticle Assemblies ◽  
Enhanced Sensitivity

scholarly journals Robust plasmonic hot-spots in a metamaterial lattice for enhanced sensitivity of infrared molecular detection

2017 ◽  
Vol 111 (24) ◽  
pp. 243106 ◽  
Author(s):  
Atsushi Ishikawa ◽  
Shuhei Hara ◽  
Takuo Tanaka ◽  
Xiang Zhang ◽  
Kenji Tsuruta
Keyword(s):  
Hot Spots ◽  
Molecular Detection ◽  
Enhanced Sensitivity

scholarly journals Deterministic temperature shaping using plasmonic nanoparticle assemblies

Nanoscale ◽  
2014 ◽  
Vol 6 (15) ◽  
pp. 8984-8989 ◽  
Author(s):  
Guillaume Baffou ◽  
Esteban Bermúdez Ureña ◽  
Pascal Berto ◽  
Serge Monneret ◽  
Romain Quidant ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Temperature Field ◽  
Plasmonic Nanoparticle ◽  
Nanoparticle Assemblies

We developed a technique based on the use of smart patterns of gold nanoparticles under illumination to generate any temperature field on the microscale.

scholarly journals Multiplexed and single-cell detection of microRNA with plasmonic nanoparticle assemblies

2021 ◽  
Author(s):  
Gurbrinder Ghotra ◽  
Nguyen Le ◽  
Heyam Hayder ◽  
Chun Peng ◽  
Jennifer I. L. Chen
Keyword(s):  
Nucleic Acid ◽  
Single Cell ◽  
Low Cost ◽  
Single Cells ◽  
Cell Detection ◽  
Label Free ◽  
Plasmonic Nanoparticle ◽  
Nanoparticle Assemblies ◽  
Single Cell Detection ◽  
Target Binding

We present a label-free, low cost and miniatured biosensing platform based on the disassembly of core-satellite plasmonic nanoparticle assemblies. The rapid and selective detection of an exemplary nucleic acid biomarker, has-miRNA-210-3p, was achieved via the strand displacement nucleic acid reaction. Target binding leads to dehybridization of the DNA linkers and changes in the scattering properties of nanostructures as monitored by darkfield microscopy. We demonstrate the ability to detect microRNA expunged from single cells and the potential to multiplex discrete assemblies to enable diverse biological applicability. The work may help translate the applicability of microRNA as diagnostic biomarkers, quantitate their abundance in the microenvironment, and facilitate the study of their correlation or causation to other biomolecules at the single-cell level.

Nanoscale thermodynamics of biological interfacial tension

2010 ◽  
Vol 467 (2126) ◽  
pp. 559-568 ◽  
Author(s):  
Ariel Fernández
Keyword(s):  
Phase Separation ◽  
Interfacial Tension ◽  
Dielectric Relaxation ◽  
Hot Spots ◽  
De Novo ◽  
Scale Dependence ◽  
Length Scale ◽  
Biological Water ◽  
Biological Interfaces ◽  
Nanoscale Patterns

The interfacial tension of biological water, a promoter of biomolecular interactions, is difficult to determine because of the inhomogeneous nanoscale patterns that make up the surface of biomolecules. These patterns modulate solubility in peculiar manners, enabling specific associations while preventing phase separation or precipitation. In this work, we derive de novo the nanoscale thermodynamics associated with the creation of biological interfaces and validate the results against experimentally identified complex interfaces. Interfacial tension is shown to be generated by hot spots of red-shifted dielectric relaxation. The most common spots involve hindered polar hydration. Taken collectively, these patches contribute more to the interfacial tension than the better known non-polar cavities with nanometre curvature, where our results agree with the established length-scale dependence of hydrophobicity. The thermodynamic results are validated by showing that the inferred patches of interfacial tension actually promote biomolecular associations.

Interparticle Gap Geometry Effects on Chiroptical Properties of Plasmonic Nanoparticle Assemblies

2021 ◽  
Author(s):  
Feng Li ◽  
Skandan Chandrasekar ◽  
Aftab Ahmed ◽  
Anna Klinkova
Keyword(s):  
Rational Design ◽  
Incident Light ◽  
Structure Property ◽  
Large Area ◽  
Chiroptical Properties ◽  
Plasmonic Nanoparticle ◽  
Face To Face ◽  
Nanoparticle Assemblies ◽  
Systematic Understanding ◽  
Difference Time

Abstract Chiral linear assemblies of plasmonic nanoparticles with chiral optical activity often show low asymmetry factors. Systematic understanding of the structure-property relationship in these systems must be improved to facilitate rational design of their chiroptical response. Here we study the effect of large-area interparticle gaps in chiral linear nanoparticle assemblies on their chiroptical properties using a tetrahelix structure formed by a linear face-to-face assembly of nanoscale Au tetrahedra. Using finite-difference time-domain and finite element methods, we performed in-depth evaluation of the extinction spectra and electric field distribution in the tetrahelix structure and its dependence on various geometric parameters. The reported structure supports various plasmonic modes, one of which shows a strong incident light handedness selectivity that is associated with large face-to-face junctions. This works highlights the importance of gap engineering in chiral plasmonic assemblies to achieve g-factors greater than 1 and produce structures with a handedness-selective optical response.

scholarly journals Symmetry Breaking in Tetrahedral Chiral Plasmonic Nanoparticle Assemblies

ACS Photonics ◽  
2014 ◽  
Vol 1 (11) ◽  
pp. 1189-1196 ◽  
Author(s):  
Vivian E. Ferry ◽  
Jessica M. Smith ◽  
A. Paul Alivisatos
Keyword(s):  
Symmetry Breaking ◽  
Plasmonic Nanoparticle ◽  
Nanoparticle Assemblies

Robust clicked assembly based on iron oxide nanoparticles for a new type of SPR biosensor

2018 ◽  
Vol 6 (34) ◽  
pp. 9102-9110 ◽  
Author(s):  
Mathias Dolci ◽  
Jean-François Bryche ◽  
Cedric Leuvrey ◽  
Spyridon Zafeiratos ◽  
Simon Gree ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticle ◽  
Oxide Nanoparticles ◽  
Nanoparticle Assemblies ◽  
Enhanced Sensitivity ◽  
Spr Biosensor ◽  
New Type ◽  
Tunable Structure ◽  
Oxide Nanoparticle ◽  
Novel Strategy

A novel strategy to create an original nanostructured SPR biosensor with enhanced sensitivity is reported. Iron oxide nanoparticle assemblies with tunable structure and decorated with bio receptors were grafted onto gold thin films by taking advantage of “click” chemistry.

Trapping Proteins within Gold Nanoparticle Assemblies: Dynamically Tunable Hot-spots for Nanobiosensing

Plasmonics ◽  
2012 ◽  
Vol 8 (2) ◽  
pp. 537-544 ◽  
Author(s):  
Abdennour Abbas ◽  
Max Fei ◽  
Limei Tian ◽  
Srikanth Singamaneni
Keyword(s):  
Gold Nanoparticle ◽  
Hot Spots ◽  
Nanoparticle Assemblies
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