Iron Oxide–Gold Composite Nanoparticles and Nano-Gap Junctions for Sensing Applications Using Surface-Enhanced Raman Scattering

2021 ◽  
pp. 255-275
Author(s):  
Simona E. Hunyadi Murph ◽  
Emily Searles
Keyword(s):  
Iron Oxide ◽  
Raman Scattering ◽  
Gap Junctions ◽  
Surface Enhanced Raman Scattering ◽  
Composite Nanoparticles ◽  
Sensing Applications ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Nanoparticle Tracers in Reservoir-On-A-chip by Surface-Enhanced Raman Scattering - Fluorescence SERS-SEF Imaging Technology

2021 ◽  
Author(s):  
Sehoon Chang ◽  
Shannon L. Eichmann ◽  
Wei Wang
Keyword(s):  
Porous Media ◽  
Raman Scattering ◽  
Surface Enhanced Raman Scattering ◽  
Composite Nanoparticles ◽  
Dye Molecules ◽  
Enhanced Fluorescence ◽  
Surface Enhanced Fluorescence ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Abstract Nanoparticles or nanocomposite fluids are injected into oil reservoirs for reservoir tracing or to improve injectivity or recovery of oil. Effective application of nanoparticles in fluid flooding still needs to be investigated. Dual-mode surface-enhanced Raman scattering (SERS) - surface-enhanced fluorescence (SEF) composite nanoparticles have been developed as nanoparticle reservoir tracers. This presentation discusses their transport and detectability in porous media, providing valuable information for understanding the role of nanoparticles in EOR process. The dual-mode surface-enhanced Raman scattering (SERS) - surface-enhanced fluorescence (SEF) composite nanoparticles are synthesized composed of Ag or Au metal cores, specific dye molecules, and a SiO2 shell materials. To optimize maximum signal enhancement of both phenomena such as SERS and SEF, the distance between core metal nanoparticles and dye molecules are precisely controlled. The synthesized composite nanoparticles barcoded with dye molecules are detectable by both fluorescence and Raman spectroscopies due to the SERS-SEF phenomena. Both fluorescence and Raman microscopic images of dye embedded surfaceenhanced Raman scattering (SERS) surface-enhanced fluorescence (SEF) composite nanoparticles in water phase successfully were collected within microfluidic reservoir-on-a-chip. The reservoir-on-a-chip utilized in this study fabricated based on reservoir rock geometry and coated with calcium carbonate. The synthesized SERS-SEF composite nanoparticles in water solution have been flooded into the microfluidic reservoir-on-a-chip and imaged for probing interfacial behavior of fluids such as liquid-liquid interfaces and studying the behavior of nanoparticles at liquid-rock interfaces. The precise synthesis method to produce the composite nanoparticles has been developed for the embedded dye molecules to generate noticeably enhanced detectability due to the strong SERS phenomenon. In conclusion, SERS-SEF nanoparticles barcoded with the fingerprinted Raman and fluorescence signals can provide a possible pathway toward SERS-SEF nanoprobe as various barcoded tracers to understand fluid behavior in porous media. Composite nanoparticle synthesis and its detection in flow technologies have been developed for visualization of the fluid flow behavior in porous media representing reservoir rock geometry. The results of the high-resolution nanoparticle fluid imaging data in reservoir-on-a-chip can be applied to understand mechanism of nanoparticle fluid assisted chemical enhanced oil recovery.

Graphene-based nanoplatforms for surface-enhanced Raman scattering sensing

The Analyst ◽  
2018 ◽  
Vol 143 (21) ◽  
pp. 5074-5089 ◽  
Author(s):  
Zhuqing Wang ◽  
Shasha Wu ◽  
Lucio Colombi Ciacchi ◽  
Gang Wei
Keyword(s):  
Raman Scattering ◽  
Surface Enhanced Raman Scattering ◽  
Sensing Applications ◽  
Recent Advances ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Sers Sensing

We demonstrate recent advances in the fabrication and SERS sensing applications of graphene-based nanoplatforms.

Optical and surface enhanced Raman scattering properties of Au nanoparticles embedded in and located on a carbonaceous matrix

2016 ◽  
Vol 18 (4) ◽  
pp. 2468-2480 ◽  
Author(s):  
Jai Prakash ◽  
Vinod Kumar ◽  
R. E. Kroon ◽  
K. Asokan ◽  
V. Rigato ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Au Nanoparticles ◽  
Surface Enhanced Raman Scattering ◽  
Sensing Applications ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
The Subject

Au nanoparticles (NPs) on the surface and embedded in a matrix have been the subject of studies dealing with a variety of spectroscopic and sensing applications.

Surface-Enhanced Raman Scattering Spectra of Non-Fluorescent 4-Mercaptobenzoic Acid and Human Red Blood Cells on Carnation-Shaped Silver Meso-Flowers Monolayer

2020 ◽  
Vol 15 (11) ◽  
pp. 1356-1363
Author(s):  
Shuang-Mei Zhu ◽  
Xi-Guang Dong ◽  
Er-Jun Liang ◽  
Hong-Wei Hou ◽  
Hao-Shan Hao ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Red Blood Cells ◽  
Blood Cells ◽  
Surface Enhanced Raman Scattering ◽  
Sers Substrate ◽  
Sers Substrates ◽  
Sensing Applications ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

The development of new surface-enhanced Raman scattering (SERS) substrates is primarily motivated by designing synthetic substrates to obtain the significant signal enhancement. In this paper, a large-scale carnation-shaped Ag meso-flowers monolayer with sufficient “hot spots” has been synthesized on copper foil without using any capping agent. In dimethyl sulfoxide, AgNO3 is reduced by Cu for 60 min at 35 °C through the galvanic displacement reaction, and carnation-shaped Ag meso-flowers with good crystallinity and high purity are obtained. The as-fabricated carnation-shaped Ag meso-flowers monolayer is used as novel SERS substrates. Non-fluorescent 4-mercaptobenzoic acid is selected as the probe molecule to test the SERS activity, uniformity and enhancement factors (EF) of the monolayer. Experimental results show that the EF of the carnation-shaped Ag meso-flowers monolayer is up to 7.06×108 and the limit of detection is 10-11 M. Meanwhile, the biocompatibility of the carnation-shaped silver meso-flowers monolayer is tested for red blood cells detection. SERS measurements demonstrate that the carnation-shaped silver meso-flowers monolayer has good activity, uniformity and biocompatibility, and can be used as an outstanding SERS substrate, which has a broad application prospect in numerous chemical and biochemical sensing applications.

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