scholarly journals Positively-charged plasmonic nanostructures for SERS sensing applications

RSC Advances ◽  
2022 ◽  
Vol 12 (2) ◽  
pp. 845-859
Author(s):  
Mariacristina Turino ◽  
Nicolas Pazos-Perez ◽  
Luca Guerrini ◽  
Ramon A. Alvarez-Puebla
Keyword(s):  
Plasmonic Nanostructures ◽  
Charged Species ◽  
Sensing Applications ◽  
Sers Sensing ◽  
Positively Charged ◽  
The Way

Integration of ligands equipped with quaternary amines on plasmonic surfaces generates positively-charged nanomaterials suitable for electrostatically binding negatively-charged species paving the way for their application in 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 Hybrid plasmonic nanostructures based on controlled integration of MoS2 flakes on metallic nanoholes

Nanoscale ◽  
2018 ◽  
Vol 10 (36) ◽  
pp. 17105-17111 ◽  
Author(s):  
Denis Garoli ◽  
Dario Mosconi ◽  
Ermanno Miele ◽  
Nicolò Maccaferri ◽  
Matteo Ardini ◽  
...  
Keyword(s):  
Plasmonic Nanostructures ◽  
2D Material ◽  
Novel Method ◽  
The Way

A novel method for the preparation of hybrid 2D-material/plasmonic nanostructures paving the way toward hybrid plasmonic nanopores.

scholarly journals Magneto-Optical Nanostructures for Viral Sensing

Nanomaterials ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1271 ◽  
Author(s):  
Sabine Szunerits ◽  
Tamazouzt Nait Saada ◽  
Dalila Meziane ◽  
Rabah Boukherroub
Keyword(s):  
Viral Infections ◽  
Signal To Noise Ratio ◽  
Viral Disease ◽  
Magnetic Bead ◽  
Superparamagnetic Nanoparticles ◽  
Plasmonic Nanostructures ◽  
Complex Matrix ◽  
Severe Respiratory Distress ◽  
Sensing Applications ◽  
Optical Nanostructures

The eradication of viral infections is an ongoing challenge in the medical field, as currently evidenced with the newly emerged Coronavirus disease 2019 (COVID-19) associated with severe respiratory distress. As treatments are often not available, early detection of an eventual infection and its level becomes of outmost importance. Nanomaterials and nanotechnological approaches are increasingly used in the field of viral sensing to address issues related to signal-to-noise ratio, limiting the sensitivity of the sensor. Superparamagnetic nanoparticles (MPs) present one of the most exciting prospects for magnetic bead-based viral aggregation assays and their integration into different biosensing strategies as they can be easily separated from a complex matrix containing the virus through the application of an external magnetic field. Despite the enormous potential of MPs as capture/pre-concentrating elements, they are not ideal with regard of being active elements in sensing applications as they are not the sensor element itself. Even though engineering of magneto-plasmonic nanostructures as promising hybrid materials directly applicable for sensing due to their plasmonic properties are often used in sensing, to our surprise, the literature of magneto-plasmonic nanostructures for viral sensing is limited to some examples. Considering the wide interest this topic is evoking at present, the different approaches will be discussed in more detail and put into wider perspectives for sensing of viral disease markers.

Synthesis of coral-shaped gold nanoparticles for SERS sensing applications

2018 ◽  
Vol 5 (9) ◽  
pp. 095003
Author(s):  
Richard E Darienzo ◽  
Kathryn Karius ◽  
Niveditha Obla ◽  
Chung-Chueh Chang ◽  
Tatsiana Mironava
Keyword(s):  
Gold Nanoparticles ◽  
Sensing Applications ◽  
Sers Sensing

scholarly journals Plasmonic Nanolenses Produced by Cylindrical Vector Beam Printing for Sensing Applications

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
S. A. Syubaev ◽  
A. Yu. Zhizhchenko ◽  
D. V. Pavlov ◽  
S. O. Gurbatov ◽  
E. V. Pustovalov ◽  
...  
Keyword(s):  
Ion Beam ◽  
Real Life ◽  
Plasmonic Nanostructures ◽  
Light Fields ◽  
Vector Beam ◽  
Sensing Applications ◽  
Metal Insulator Metal ◽  
Back Reflector ◽  
Radially Polarized ◽  
Cylindrical Vector Beam

AbstractInteraction of complex-shaped light fields with specially designed plasmonic nanostructures gives rise to various intriguing optical phenomena like nanofocusing of surface waves, enhanced nonlinear optical response and appearance of specific low-loss modes, which can not be excited with ordinary Gaussian-shaped beams. Related complex-shaped nanostructures are commonly fabricated using rather expensive and time-consuming electron- and ion-beam lithography techniques limiting real-life applicability of such an approach. In this respect, plasmonic nanostructures designed to benefit from their excitation with complex-shaped light fields, as well as high-performing techniques allowing inexpensive and flexible fabrication of such structures, are of great demand for various applications. Here, we demonstrate a simple direct maskless laser-based approach for fabrication of back-reflector-coupled plasmonic nanorings arrays. The approach is based on delicate ablation of an upper metal film of a metal-insulator-metal (MIM) sandwich with donut-shaped laser pulses followed by argon ion-beam polishing. After being excited with a radially polarized beam, the MIM configuration of the nanorings permitted to realize efficient nanofocusing of constructively interfering plasmonic waves excited in the gap area between the nanoring and back-reflector mirror. For optimized MIM geometry excited by radially polarized CVB, substantial enhancement of the electromagnetic near-fields at the center of the ring within a single focal spot with the size of 0.37λ2 can be achieved, which is confirmed by Finite Difference Time Domain calculations, as well as by detection of 100-fold enhanced photoluminescent signal from adsorbed organic dye molecules. Simple large-scale and cost-efficient fabrication procedure offering also a freedom in the choice of materials to design MIM structures, along with remarkable optical and plasmonic characteristics of the produced structures make them promising for realization of various nanophotonic and biosensing platforms that utilize cylindrical vector beam as a pump source.

Plasmon-coupled 3D porous hotspot architecture for super-sensitive quantitative SERS sensing of toxic substances on real sample surfaces

2019 ◽  
Vol 21 (35) ◽  
pp. 19288-19297 ◽  
Author(s):  
Maofeng Zhang ◽  
Jian Yang ◽  
Yaru Wang ◽  
Haoran Sun ◽  
Hongyang Zhou ◽  
...  
Keyword(s):  
Real Sample ◽  
Plasmonic Nanostructures ◽  
Toxic Substances ◽  
Sers Detection ◽  
Quantitative Sers ◽  
Sers Sensing

3D porous AgNPs/Cu plasmonic nanostructures allow for fast, sensitive and quantitative SERS detection of toxic residues on real sample surfaces.

scholarly journals Highly Sensitive and Selective Nanogap-Enhanced SERS Sensing Platform

Nanomaterials ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 619 ◽  
Author(s):  
ChaeWon Mun ◽  
Vo Thi Nhat Linh ◽  
Jung-Dae Kwon ◽  
Ho Sang Jung ◽  
Dong-Ho Kim ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Near Field ◽  
Polymer Surface ◽  
Molecular Size ◽  
Surface Enhanced Raman Spectroscopy ◽  
Localized Surface Plasmon ◽  
Plasmonic Nanostructures ◽  
Sensing Platform ◽  
Highly Sensitive ◽  
Sers Sensing

This paper reports a highly sensitive and selective surface-enhanced Raman spectroscopy (SERS) sensing platform. We used a simple fabrication method to generate plasmonic hotspots through a direct maskless plasma etching of a polymer surface and the surface tension-driven assembly of high aspect ratio Ag/polymer nanopillars. These collapsed plasmonic nanopillars produced an enhanced near-field interaction via coupled localized surface plasmon resonance. The high density of the small nanogaps yielded a high plasmonic detection performance, with an average SERS enhancement factor of 1.5 × 107. More importantly, we demonstrated that the encapsulation of plasmonic nanostructures within nanofiltration membranes allowed the selective filtration of small molecules based on the degree of membrane swelling in organic solvents and molecular size. Nanofiltration membrane-encapsulated SERS substrates do not require pretreatments. Therefore, they provide a simple and fast detection of toxic molecules using portable Raman spectroscopy.

scholarly journals Biomimetic microstructures for photonic and fluidic synergies

2017 ◽  
Vol 4 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Maria Vasileiou ◽  
Theodora Mpatzaka ◽  
Dimitris Alexandropoulos ◽  
Nikolaos A. Vainos
Keyword(s):  
Hydrophobic Properties ◽  
Lab On Chip ◽  
Sensing Applications ◽  
Nano Structures ◽  
Vanessa Cardui ◽  
On Chip ◽  
Optical Behavior ◽  
The Way

AbstractNature-inspired micro- and nano-structures offer a unique platform for the development of novel synergetic systems combining photonic and microfluidic functionalities. In this context, we examine the paradigm of butterfly Vanessa cardui and develop artificial diffractive microstructures inspired by its natural designs. Softlithographic and nanoimprint protocols are developed to replicate surfaces of natural specimens. Further to their optical behavior, interphases tailored by such microstructures exhibit enhanced hydrophobic properties, as compared to their planar counterparts made of the same materials. Such synergies exploited by new design approaches pave the way to prospective optofluidic, lab-on-chip and sensing applications.

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