scholarly journals Magnetic Nanomotor-Based Maneuverable SERS Probe

Research ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Yong Wang ◽  
Yuhuan Liu ◽  
Yang Li ◽  
Dandan Xu ◽  
Xi Pan ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Signal To Noise Ratio ◽  
Surface Enhanced Raman Spectroscopy ◽  
The Self ◽  
Rotating Magnetic Field ◽  
Small Scale ◽  
Biochemical Sensing ◽  
Surface Enhanced Raman ◽  
Single Use ◽  
Sers Sensing

Surface-enhanced Raman spectroscopy (SERS) is a powerful sensing technique capable of capturing ultrasensitive fingerprint signal of analytes with extremely low concentration. However, conventional SERS probes are passive nanoparticles which are usually massively applied for biochemical sensing, lacking controllability and adaptability for precise and targeted sensing at a small scale. Herein, we report a “rod-like” magnetic nanomotor-based SERS probe (MNM-SP) that integrates a mobile and controllable platform of micro-/nanomotors with a SERS sensing technique. The “rod-like” structure is prepared by coating a thin layer of silica onto the self-assembled magnetic nanoparticles. Afterwards, SERS hotspots of silver nanoparticles (AgNPs) are decorated as detecting nanoprobes. The MNM-SPs can be navigated on-demand to avoid obstacles and target sensing sites by the guidance of an external gradient magnetic field. Through applying a rotating magnetic field, the MNM-SPs can actively rotate to efficiently stir and mix surrounding fluid and thus contact with analytes quickly for SERS sensing. Innovatively, we demonstrate the self-cleaning capability of the MNM-SPs which can be used to overcome the contamination problem of traditional single-use SERS probes. Furthermore, the MNM-SPs could precisely approach the targeted single cell and then enter into the cell by endocytosis. It is worth mentioning that by the effective mixing of intracellular biocomponents, much more informative Raman signals with improved signal-to-noise ratio can be captured after active rotation. Therefore, the demonstrated magnetically activated MNM-SPs that are endowed with SERS sensing capability pave way to the future development of smart sensing probes with maneuverability for biochemical analysis at the micro-/nanoscale.

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.

scholarly journals SERS Sensing Properties of New Graphene/Gold Nanocomposite

Nanomaterials ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 1236 ◽  
Author(s):  
Giulia Neri ◽  
Enza Fazio ◽  
Placido Giuseppe Mineo ◽  
Angela Scala ◽  
Anna Piperno
Keyword(s):  
Rhodamine 6G ◽  
Surface Enhanced Raman Spectroscopy ◽  
Molecular Probes ◽  
Au Nps ◽  
Nitrogen Doped ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene ◽  
Sers Sensing

The development of graphene (G) substrates without damage on the sp2 network allows to tune the interactions with plasmonic noble metal surfaces to finally enhance surface enhanced Raman spectroscopy (SERS) effect. Here, we describe a new graphene/gold nanocomposite obtained by loading gold nanoparticles (Au NPs), produced by pulsed laser ablation in liquids (PLAL), on a new nitrogen-doped graphene platform (G-NH2). The graphene platform was synthesized by direct delamination and chemical functionalization of graphite flakes with 4-methyl-2-p-nitrophenyl oxazolone, followed by reduction of p-nitrophenyl groups. Finally, the G-NH2/Au SERS platform was prepared by using the conventional aerography spraying technique. SERS properties of G-NH2/Au were tested using Rhodamine 6G (Rh6G) and Dopamine (DA) as molecular probes. Raman features of Rh6G and DA are still detectable for concentration values down to 1 × 10−5 M and 1 × 10−6 M respectively.

scholarly journals Electric field induced surface-enhanced Raman spectroscopy for multianalyte detection

2015 ◽  
Vol 17 (11) ◽  
pp. 7095-7099 ◽  
Author(s):  
Sumeet Walia ◽  
Aditya K. Shah ◽  
Paul R. Stoddart ◽  
Madhu Bhaskaran ◽  
Sharath Sriram
Keyword(s):  
Raman Spectroscopy ◽  
Electric Field ◽  
Surface Enhanced Raman Spectroscopy ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Multianalyte Detection ◽  
Sers Sensing

This work demonstrates the ability to detect and isolate an analyte from a multianalyte mixture by SERS sensing.

Highly sensitive and uniform surface-enhanced Raman spectroscopy from grating-integrated plasmonic nanograss

2016 ◽  
Vol 1 (4) ◽  
pp. 290-297 ◽  
Author(s):  
Yang Shen ◽  
Xizhe Cheng ◽  
Guozhen Li ◽  
Qiangzhong Zhu ◽  
Zhenguo Chi ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Surface Enhanced Raman Spectroscopy ◽  
Signal Enhancement ◽  
Highly Sensitive ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Planar Substrates ◽  
Sers Sensing

We developed a SERS sensing strategy based on grating-integrated substrates with 10-fold signal enhancement compared to the planar substrates.

scholarly journals Rotation of Liquid Metal Droplets Solely Driven by the Action of Magnetic Fields

2019 ◽  
Vol 9 (7) ◽  
pp. 1421 ◽  
Author(s):  
Jian Shu ◽  
Shi-Yang Tang ◽  
Sizepeng Zhao ◽  
Zhihua Feng ◽  
Haoyao Chen ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Liquid Metal ◽  
Permanent Magnets ◽  
The Self ◽  
Rotating Magnetic Field ◽  
Fluid Mixture ◽  
Cooling Fluid ◽  
Novel Method ◽  
Metal Droplets

The self-rotation of liquid metal droplets (LMDs) has garnered potential for numerous applications, such as chip cooling, fluid mixture, and robotics. However, the controllable self-rotation of LMDs utilizing magnetic fields is still underexplored. Here, we report a novel method to induce self-rotation of LMDs solely utilizing a rotating magnetic field. This is achieved by rotating a pair of permanent magnets around a LMD located at the magnetic field center. The LMD experiences Lorenz force generated by the relative motion between the droplet and the permanent magnets and can be rotated. Remarkably, unlike the actuation induced by electrochemistry, the rotational motion of the droplet induced by magnetic fields avoids the generation of gas bubbles and behaves smoothly and steadily. We investigate the main parameters that affect the self-rotational behaviors of LMDs and validate the theory of this approach. We further demonstrate the ability of accelerating cooling and a mixer enabled by the self-rotation of a LMD. We believe that the presented technique can be conveniently adapted by other systems after necessary modifications and enables new progress in microfluidics, microelectromechanical (MEMS) applications, and micro robotics.

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.

scholarly journals Waveguide excitation and collection of surface-enhanced Raman scattering from a single plasmonic antenna

Nanophotonics ◽  
2018 ◽  
Vol 7 (7) ◽  
pp. 1299-1306 ◽  
Author(s):  
Frédéric Peyskens ◽  
Pieter Wuytens ◽  
Ali Raza ◽  
Pol Van Dorpe ◽  
Roel Baets
Keyword(s):  
Signal To Noise Ratio ◽  
Single Mode ◽  
Surface Enhanced Raman Spectroscopy ◽  
Sers Spectrum ◽  
Plasmonic Enhancement ◽  
Detection Scheme ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
On Chip

AbstractThe integration of plasmonic antennas on single-mode silicon nitride waveguides offers great perspective for integrated surface-enhanced Raman spectroscopy (SERS). However, the few reported experimental demonstrations still require multiple plasmonic antennas to obtain a detectable SERS spectrum. Here, we show, for the first time, SERS signal detection by a single nanoplasmonic antenna integrated on a single-mode SiN waveguide. For this purpose, we investigated a backscattering detection scheme in combination with background noise reduction, which allowed an optimization of the signal-to-noise ratio (SNR) of this platform. Furthermore, a comparison with the free-space SERS spectrum of the same antenna shows that the conversion efficiency from pump power to total radiated Stokes power is twice as efficient in the case of waveguide excitation. As such, we explored several important aspects in the optimization of on-chip SERS sensors and experimentally demonstrated the power of exciting nanoplasmonic antennas using the evanescent field of a waveguide. This observation not only is useful for Raman sensing but also could be beneficial for any process involving plasmonic enhancement.

Development of an electrochemical surface-enhanced Raman spectroscopy (EC-SERS) fabric-based plasmonic sensor for point-of-care diagnostics

The Analyst ◽  
2018 ◽  
Vol 143 (17) ◽  
pp. 4128-4135 ◽  
Author(s):  
Shruti D. Bindesri ◽  
Dalal S. Alhatab ◽  
Christa L. Brosseau
Keyword(s):  
Raman Spectroscopy ◽  
Point Of Care ◽  
Surface Enhanced Raman Spectroscopy ◽  
Plasmonic Sensor ◽  
Point Of Care Diagnostics ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Sers Sensing

A plasmonic fabric-based electrode has been developed for wearable EC-SERS sensing for point-of-care applications.

The orbits of electrons and ions in the fields of the rotamak

1987 ◽  
Vol 37 (1) ◽  
pp. 1-13 ◽  
Author(s):  
W. N. Hugrass ◽  
M. Turley
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Charged Particles ◽  
The Self ◽  
Rotating Magnetic Field ◽  
Plasma Equilibrium ◽  
Rotating Magnetic Fields ◽  
Cylindrical Plasma ◽  
Electrons And Ions ◽  
Self Consistent

The motion of electrons and ions in the self-consistent fields of a compact toroidal equilibrium maintained by means of a rotating magnetic field is studied. It is found that the particles are confined although the lines of the instantaneous magnetic field are open. The results are compared with those obtained in an earlier study of the motion of charged particles in the self-consistent fields appropriate to cylindrical plasma equilibrium maintained by means of rotating magnetic fields.

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