scholarly journals Coupled noble metal nanostructures for high-performance surface-enhanced spectroscopies

2016 ◽  
Author(s):  
Anran Li
2015 ◽  
Vol 4 (3) ◽  
Author(s):  
Hongyan Liang ◽  
Hong Wei ◽  
Deng Pan ◽  
Hongxing Xu

AbstractNoble metal nanostructures have drawn attentions of researchers in many fields due to their particular optical properties. Controlling the metal nanostructures’ size, shape, material, assembly, and surrounding environment can tune their unique plasmonic features that are important for practical applications. In this review, we firstly discuss some novel metal nanostructures synthesized through wet chemical methods and their fundamental plasmonic properties. Then, some applications of these chemically synthesized nanostructures in plasmonics are highlighted, including surface-enhanced Raman spectroscopy, plasmonic sensing, optical nanoantennas, and plasmonic circuitry. Plasmonic nanostructures provide the ways to manipulate light at the nanometer scale and open the prospects of developing nanophotonic devices for sensing and information technologies.


2021 ◽  
Author(s):  
Jeffery Alexander Powell

Raman spectroscopy is a powerful tool for detection of chemical and bioanalytes but lacks enhancement required to detect these analytes at the ultrahigh sensitivity needed for many applications. Surface enhanced Raman Scattering is a technique by which an analyte signal can become greatly enhanced and, near single molecule sensitivity, is achievable. Currently, SERS-based detection platforms currently rely on noble metal nanostructures as primary enhancing sources for the detection of chemical and bioanalytes but have significant limitations in terms of reproducibility and biocompatibility. Recent research has shown that semiconductors have the ability to exhibit SERS enhancing characteristics that can potentially supplant the use of noble metals without the limitations associated with noble metal nanomaterials. This thesis presents, the generation of three-dimensional self-assembled hybrid silicon nanostructures though a laser-ion plume formation mechanism. These Si nanostructures exhibit high sensitivity SERS enhancement characteristics which can be applied for chemical and biosensing applications. In this thesis, the Raman enhancing characteristics of the hybrid Si nanostructures are examined and correlated to the unique physical morphology and material chemistry of these nanostructures. These Si nanostructures are shown to be comprised of individual Si nanospheroids that have fused to form a highly 3D nanoweb-like self-assembled nanostructures. It is also shown that these nanospheroids are composed of both amorphous and polycrystalline sub-regions, which can only be generated within an ion-plume formed by a femtosecond pulsed laser. By programming the laser, the nanostructure morphology and hybrid nature can be manipulated and optimized. These Si nanostructures are shown to be highly sensitive as SERS platforms for chemical analytes. In addition, it is shown that with the application of noble metal nanoparticles on the surface of the 3D hybrid silicon nanowebs structures, an additional enhancement boost can be optimized for the detection of chemical molecules. With this, the dual contribution to the SERS sensitivity from both the primary Si nanostructures and the secondary noble metal nanostructures can be used to detect the presence of a biomolecule analyte is shown. To delve deeper into how these hybrid Si nanostructures cause SERS enhancement of bioanalytes, the Si ion interactions within the laser-ion plume were manipulated to induce quantum-scale defects within the hybrid Si nanospheroids. By creating both an inert and oxygenated laser-ion plumes the formation of sub-nanograins within the nanospheroids and sub-nanovoids on the nanospheroid surface is shown to significantly enhance the detection of bioanalyte signal for multiple biomolecules which act as signals for various diseases. Based on the results in this thesis, it has been proven that Si-based nanostructures have the capacity to be used as sole SERS enhancing sources for chemical and biomolecule analytes.


2020 ◽  
Vol 2 (4) ◽  
pp. 309-315
Author(s):  
Chunji Li ◽  
Mingchuan Luo ◽  
Zhonghong Xia ◽  
Shaojun Guo

2019 ◽  
Vol 53 (14) ◽  
pp. 1950-1953 ◽  
Author(s):  
V. K. Goncharov ◽  
K. V. Kozadaev ◽  
A. P. Mikitchuk ◽  
M. V. Puzyrev

2018 ◽  
Vol 52 (14) ◽  
pp. 1839-1842 ◽  
Author(s):  
A. P. Mikitchuk ◽  
K. V. Kozadaev

Author(s):  
Olayemi J. Fakayode ◽  
Adewale O. Oladipo ◽  
Oluwatobi S. Oluwafemi ◽  
Sandile P. Songca

2020 ◽  
Vol 7 (2) ◽  
pp. 541-550 ◽  
Author(s):  
Mateusz Odziomek ◽  
Mounib Bahri ◽  
Cedric Boissiere ◽  
Clement Sanchez ◽  
Benedikt Lassalle-Kaiser ◽  
...  

Porous noble metal nanostructures providing high surface areas and large pore volumes are attractive for numerous applications, especially catalysis.


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