Fabrication and characterization of the noble metal nanostructures on the GaAs surface

2016 ◽  
Author(s):  
Polina V. Gladskikh ◽  
Igor A. Gladskikh ◽  
Nikita A. Toropov ◽  
Tigran A. Vartanyan
Keyword(s):  
Noble Metal ◽  
Gaas Surface ◽  
Metal Nanostructures ◽  
Fabrication And Characterization ◽  
Noble Metal Nanostructures

scholarly journals Three-dimensional self-assembled hybrid silicon nanostructures for high sensitivity SERS chemical and biosensing applications

2021 ◽  
Author(s):  
Jeffery Alexander Powell
Keyword(s):  
Noble Metal ◽  
Three Dimensional ◽  
High Sensitivity ◽  
Metal Nanostructures ◽  
Silicon Nanostructures ◽  
Sers Enhancement ◽  
Noble Metal Nanostructures ◽  
Self Assembled ◽  
Hybrid Silicon ◽  
Si Nanostructures

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.

scholarly journals High-index faceted noble metal nanostructures drive renewable energy electrocatalysis

2020 ◽  
Vol 2 (4) ◽  
pp. 309-315
Author(s):  
Chunji Li ◽  
Mingchuan Luo ◽  
Zhonghong Xia ◽  
Shaojun Guo
Keyword(s):  
Renewable Energy ◽  
Noble Metal ◽  
High Index ◽  
Metal Nanostructures ◽  
Noble Metal Nanostructures

Synthesis, Structural and Spectral Properties of Surface Noble Metal Nanostructures for Fiber-Optic Photoacoustic Generation

2019 ◽  
Vol 53 (14) ◽  
pp. 1950-1953 ◽  
Author(s):  
V. K. Goncharov ◽  
K. V. Kozadaev ◽  
A. P. Mikitchuk ◽  
M. V. Puzyrev
Keyword(s):  
Noble Metal ◽  
Spectral Properties ◽  
Fiber Optic ◽  
Metal Nanostructures ◽  
Noble Metal Nanostructures

Photoacoustic Generation with Surface Noble Metal Nanostructures

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

scholarly journals Biopolymer-mediated Green Synthesis of Noble Metal Nanostructures

10.5772/62127 ◽  
2016 ◽  
Author(s):  
Olayemi J. Fakayode ◽  
Adewale O. Oladipo ◽  
Oluwatobi S. Oluwafemi ◽  
Sandile P. Songca
Keyword(s):  
Green Synthesis ◽  
Noble Metal ◽  
Metal Nanostructures ◽  
Noble Metal Nanostructures

scholarly journals Aerosol synthesis of thermally stable porous noble metals and alloys by using bi-functional templates

2020 ◽  
Vol 7 (2) ◽  
pp. 541-550 ◽  
Author(s):  
Mateusz Odziomek ◽  
Mounib Bahri ◽  
Cedric Boissiere ◽  
Clement Sanchez ◽  
Benedikt Lassalle-Kaiser ◽  
...  
Keyword(s):  
Noble Metal ◽  
Noble Metals ◽  
High Surface ◽  
Metals And Alloys ◽  
Metal Nanostructures ◽  
Thermally Stable ◽  
Surface Areas ◽  
Large Pore ◽  
Aerosol Synthesis ◽  
Noble Metal Nanostructures

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

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