Chemically Etched Nanoporous Copper and Galvanically Displaced Silver Nanoflowers for SERS Sensing

2021 ◽  
Author(s):  
Manikantan Sajitha ◽  
Bini Abraham ◽  
Renjith B. Nelliyil ◽  
Karuvath Yoosaf
Keyword(s):  
Nanoporous Copper ◽  
Sers Sensing

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.

scholarly journals AgNPs decorated 3D bionic silicon nanograss arrays pattern with high-density hot-spots for SERS sensing via green galvanic displacement without additives

RSC Advances ◽  
2021 ◽  
Vol 11 (44) ◽  
pp. 27152-27159
Author(s):  
Li Wang ◽  
Jian Huang ◽  
Mei-Juan Su ◽  
Jin-Di Wu ◽  
Weisheng Liu
Keyword(s):  
Hot Spots ◽  
High Density ◽  
Galvanic Displacement ◽  
Si Substrate ◽  
Plasma Interaction ◽  
Organic Reagents ◽  
Vls Growth ◽  
Sers Sensing

The Si nanograss arrays are directly grown on Si substrate via catalyst-assisted VLS growth and subsequent plasma interaction. AgNPs were rapidly immobilized on Si nanograss arrays for SERS sensing, without any organic reagents and additives.

A nanozyme-based enhanced system for total removal of organic mercury and SERS sensing

2021 ◽  
Vol 405 ◽  
pp. 124642
Author(s):  
Hao Liu ◽  
Yue Guo ◽  
Yunxin Wang ◽  
Huidan Zhang ◽  
Xiaowei Ma ◽  
...  
Keyword(s):  
Organic Mercury ◽  
Total Removal ◽  
Sers Sensing
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