Surface-enhanced Raman spectroscopy for DNA detection by the self-assembly of Ag nanoparticles onto Ag nanoparticle–graphene oxide nanocomposites

2015 ◽  
Vol 17 (28) ◽  
pp. 18443-18448 ◽  
Author(s):  
Tsung-Wu Lin ◽  
Hong-Yi Wu ◽  
Ting-Ti Tasi ◽  
Ying-Huang Lai ◽  
Hsin-Hui Shen
Keyword(s):  
Graphene Oxide ◽  
Self Assembly ◽  
Ag Nanoparticles ◽  
Surface Enhanced Raman Spectroscopy ◽  
The Self ◽  
Sensing System ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Sers Sensing

A novel surface-enhanced Raman scattering (SERS) sensing system which operates by the self-assembly of Ag nanoparticles (AgNPs) onto the nanocomposite of AgNPs and graphene oxide (AgNP–GO) in the presence of two complementary DNAs has been developed.

scholarly journals Preparation of Fe3O4-Ag Nanocomposites with Silver Petals for SERS Application

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1288
Author(s):  
Thi Thuy Nguyen ◽  
Fayna Mammeri ◽  
Souad Ammar ◽  
Thi Bich Ngoc Nguyen ◽  
Trong Nghia Nguyen ◽  
...  
Keyword(s):  
Self Assembly ◽  
Hot Spots ◽  
Surface Enhanced Raman Spectroscopy ◽  
Electrical Field ◽  
Stabilizing Agents ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Sers Sensing ◽  
Applied Electrical Field ◽  
Positively Charged

The formation of silver nanopetal-Fe3O4 poly-nanocrystals assemblies and the use of the resulting hetero-nanostructures as active substrates for Surface Enhanced Raman Spectroscopy (SERS) application are here reported. In practice, about 180 nm sized polyol-made Fe3O4 spheres, constituted by 10 nm sized crystals, were functionalized by (3-aminopropyl)triethoxysilane (APTES) to become positively charged, which can then electrostatically interact with negatively charged silver seeds. Silver petals were formed by seed-mediated growth in presence of Ag+ cations and self-assembly, using L-ascorbic acid (L-AA) and polyvinyl pyrrolidone (PVP) as mid-reducing and stabilizing agents, respectively. The resulting plasmonic structure provides a rough surface with plenty of hot spots able to locally enhance significantly any applied electrical field. Additionally, they exhibited a high enough saturation magnetization with Ms = 9.7 emu g−1 to be reversibly collected by an external magnetic field, which shortened the detection time. The plasmonic property makes the engineered Fe3O4-Ag architectures particularly valuable for magnetically assisted ultra-sensitive SERS sensing. This was unambiguously established through the successful detection, in water, of traces, (down to 10−10 M) of Rhodamine 6G (R6G), at room temperature.

Graphene oxide wrapped individual silver nanocomposites with improved stability for surface-enhanced Raman scattering

RSC Advances ◽  
2015 ◽  
Vol 5 (69) ◽  
pp. 55801-55807 ◽  
Author(s):  
Nan Gao ◽  
Ting Yang ◽  
Tao Liu ◽  
Yu Zou ◽  
Jiang Jiang
Keyword(s):  
Graphene Oxide ◽  
Raman Scattering ◽  
Ag Nanoparticles ◽  
Long Term Stability ◽  
Surface Enhanced ◽  
Silver Nanocomposites ◽  
Surface Enhanced Raman ◽  
Improved Stability ◽  
Enhanced Raman Scattering

GO coating on Ag nanoparticles enhances SERS signals and improves the long term stability of Ag.

scholarly journals Colloidal core–shell materials with ‘spiky’ surfaces assembled from gold nanorods

2014 ◽  
Vol 50 (60) ◽  
pp. 8157-8160 ◽  
Author(s):  
Iris W. Guo ◽  
Idah C. Pekcevik ◽  
Michael C. P. Wang ◽  
Brandy K. Pilapil ◽  
Byron D. Gates
Keyword(s):  
Raman Spectroscopy ◽  
Gold Nanorods ◽  
Self Assembly ◽  
Colloidal Particles ◽  
Surface Enhanced Raman Spectroscopy ◽  
The Self ◽  
Core Shell ◽  
Surface Enhanced ◽  
Resonance Properties ◽  
Surface Enhanced Raman

Colloidal particles are prepared with a ‘spiky’ surface topography achieved by the self-assembly of gold nanorods onto the surfaces of spherical polystyrene cores. These core–shell assemblies exhibit surface plasmon resonance properties and serve as a platform for surface-enhanced Raman spectroscopy measurements.

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