scholarly journals Magnetite-Supported Gold Nanostars for the Uptake and SERS Detection of Tetracycline

Nanomaterials ◽  
2018 ◽  
Vol 9 (1) ◽  
pp. 31 ◽  
Author(s):  
Paula Pinheiro ◽  
Sara Fateixa ◽  
Helena Nogueira ◽  
Tito Trindade
Keyword(s):  
Hybrid Composites ◽  
Gold Nanostars ◽  
Surface Enhanced ◽  
Seed Growth ◽  
Surface Enhanced Raman ◽  
Sers Detection ◽  
Growth Method ◽  
Enhanced Raman Scattering ◽  
Supported Gold

Magnetite nanoparticles (MNPs) decorated with gold nanostars (AuNSs) have been prepared by using a seed growth method without the addition of surfactants or colloidal stabilizers. The hybrid nanomaterials were investigated as adsorbents for the uptake of tetracycline (TC) from aqueous solutions and subsequent detection using surface-enhanced Raman scattering (SERS). Several parameters were investigated in order to optimize the performance of these hybrid platforms on the uptake and SERS detection of TC, including variable pH values and the effect of contact time on the removal of TC. The spatial distribution of TC and AuNS on the hybrid composites was accomplished by coupling SERS analysis with Raman imaging studies, allowing also for the determination of the detection limit for TC when dissolved in ultrapure water (10 nM) and in more complex aqueous matrices (1 μM). Attempts were also made to investigate the adsorption modes of the TC molecules at the surface of the metal NPs by taking into account the enhancement of the Raman bands in these different matrices.

Two-dimensional MXene modified AgNRs as a surface-enhanced Raman scattering substrate for sensitive determination of polychlorinated biphenyls

The Analyst ◽  
2020 ◽  
Vol 145 (22) ◽  
pp. 7421-7428
Author(s):  
Xuejiao Fang ◽  
Yuhang Song ◽  
Yi Huang ◽  
Guohai Yang ◽  
Caiqin Han ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Polychlorinated Biphenyls ◽  
Environmental Monitoring ◽  
Two Dimensional ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Sers Detection ◽  
Enhanced Raman Scattering ◽  
Sensitive Determination

A MXene/AgNR substrate was prepared through a facile modification strategy. The substrate can perform sensitive SERS detection of polychlorinated biphenyls, which may have potential in environmental monitoring at the point of need.

SERS detection of uranyl using functionalized gold nanostars promoted by nanoparticle shape and size

The Analyst ◽  
2016 ◽  
Vol 141 (17) ◽  
pp. 5137-5143 ◽  
Author(s):  
Grace Lu ◽  
Tori Z. Forbes ◽  
Amanda J. Haes
Keyword(s):  
Raman Scattering ◽  
Surface Enhanced Raman Scattering ◽  
Nanoparticle Shape ◽  
Gold Nanostars ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Sers Detection ◽  
Enhanced Raman Scattering ◽  
Shape And Size

Quantitative uranyl detection using surface-enhanced Raman scattering and functionalized gold nanostars.

Synthesis of Alloyed Au-Ag Nanospheres with Tunable Compositions and SERS Enhancement Effects

2021 ◽  
Vol 1026 ◽  
pp. 197-207
Author(s):  
Bi Jie Xu ◽  
Ming Yong Jiang ◽  
Xiang Ning Chen ◽  
Feng Zhao ◽  
Shu Han Du ◽  
...  
Keyword(s):  
Quantitative Detection ◽  
Initial Increase ◽  
Trace Detection ◽  
Detection Model ◽  
Raman Enhancement ◽  
Surface Enhanced ◽  
Seed Growth ◽  
Surface Enhanced Raman ◽  
Growth Method ◽  
Enhanced Raman Scattering

Surface-enhanced Raman scattering (SERS) has unique properties including highsensitivity, simple operation and non-destructiveness in trace detection; and the substrate will cast adirect impact upon the SERS signal. An everlasting topic has been focused on the preparation ofSERS substrates with controllable morphologies and hotspots. Herein, we reported a SERS substratewith alloyed Au-Ag nanospheres prepared via a reduction method of two-step seed growth method inliquid phase. TEM, SEM, Raman and UV-vis characterization have been employed to investigatemicro-morphology, composition, and SERS effects. Moreover, a quantitative detection model isestablished, and the R2 of fitting reaches as high as 0.982. Finally, the effect of different nAu/nAg molarratios on the SERS effect is investigated, with results showing that Raman enhancement has a goodrise at the very first beginning, but a drop later appears along with the decreasing nAu/nAg. The limit ofdetection (LOD) of R6G on Au-Ag nanosphere substrates has an initial increase, and a decreasefollows with the decreasing nAu/nAg ratios; the mechanism is also fully investigated. The preparationof particle-sized controllable Au-Ag nanomaterials helps provide a new highly enhanced SERSsubstrate.

Electrochemical SERS Detection of Chlorinated Hydrocarbons in Aqueous Solutions

1994 ◽  
Vol 48 (10) ◽  
pp. 1265-1271 ◽  
Author(s):  
John M. E. Storey ◽  
Robert D. Shelton ◽  
Tye E. Barber ◽  
Eric A. Wachter
Keyword(s):  
Chlorinated Hydrocarbons ◽  
Copper Electrode ◽  
Specific Class ◽  
Reaction Products ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Sers Detection ◽  
Enhanced Raman Scattering

An in situ method for the determination of trichloroethylene (TCE), perchloroethylene (PCE), chloroform (CHCl3), and carbon tetrachloride (CCl4) in aqueous solution is described. The method is based on ESERS—a combination of electrochemical methods and surface-enhanced Raman scattering (SERS). Electrochemistry prepares the surface of a copper electrode for SERS and concentrates the analyte on the surface. The formation of common reaction products for chloroalkanes and for chloroalkenes prevents unequivocal differentiation within a specific class of chlorinated hydrocarbons. However, spectroscopic selectivity between the chloroalkane and chloroalkene classes is excellent, while differences in electrochemical response provide a secondary means for differentiating analyte class. Sensitivity was found to be: <1 ppm for TCE; 15 ppm for PCE; 15 ppm for CHCl3; and 10 ppm for CCl4. Application of the method to groundwater contaminated with TCE has been demonstrated. In combination with a fiber-optic waveguide, the ESERS technique offers potential for remote detection of chlorinated hydrocarbons in groundwater and remediation process streams.

Multivariate Analysis Aided Surface-Enhanced Raman Spectroscopy (MVA-SERS) Multiplex Quantitative Detection of Trace Fentanyl in Illicit Drug Mixtures Using a Handheld Raman Spectrometer

2021 ◽  
pp. 000370282110329
Author(s):  
Ling Wang ◽  
Mario O. Vendrell-Dones ◽  
Chiara Deriu ◽  
Sevde Doğruer ◽  
Peter de B. Harrington ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Principal Component ◽  
Surface Enhanced Raman Spectroscopy ◽  
Quantitative Detection ◽  
Least Squares Regression ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Sers Detection ◽  
Current Screening

Recently there has been upsurge in reports that illicit seizures of cocaine and heroin have been adulterated with fentanyl. Surface-enhanced Raman spectroscopy (SERS) provides a useful alternative to current screening procedures that permits detection of trace levels of fentanyl in mixtures. Samples are solubilized and allowed to interact with aggregated colloidal nanostars to produce a rapid and sensitive assay. In this study, we present the quantitative determination of fentanyl in heroin and cocaine using SERS, using a point-and-shoot handheld Raman system. Our protocol is optimized to detect pure fentanyl down to 0.20 ± 0.06 ng/mL and can also distinguish pure cocaine and heroin at ng/mL levels. Multiplex analysis of mixtures is enabled by combining SERS detection with principal component analysis and super partial least squares regression discriminate analysis (SPLS-DA), which allow for the determination of fentanyl as low as 0.05% in simulated seized heroin and 0.10% in simulated seized cocaine samples.

A sensitive SERS assay for detecting proteins and nucleic acids using a triple-helix molecular switch for cascade signal amplification

2014 ◽  
Vol 50 (66) ◽  
pp. 9409-9412 ◽  
Author(s):  
Sujuan Ye ◽  
Yanying Wu ◽  
Wen Zhang ◽  
Na Li ◽  
Bo Tang
Keyword(s):  
Nucleic Acids ◽  
Signal Amplification ◽  
Triple Helix ◽  
Detection System ◽  
Molecular Switch ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Sers Detection ◽  
Multiple Cycle ◽  
Enhanced Raman Scattering

A sensitive surface-enhanced Raman scattering (SERS) detection system is developed for proteins and nucleic acids based on a triple-helix molecular switch for multiple cycle signal amplification.

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