scholarly journals Exploiting the chemical differences between Ag and Au colloids allows dramatically improved SERS detection of “non-adsorbing” molecules

The Analyst ◽  
2019 ◽  
Vol 144 (2) ◽  
pp. 448-453 ◽  
Author(s):  
Ziwei Ye ◽  
Chunchun Li ◽  
Yikai Xu ◽  
Steven E. J. Bell
Keyword(s):  
Sers Detection ◽  
Au Colloids

Switching from Ag to Au colloids allows SERS of ‘non-adsorbing’ analytes such as naphthalene to be detected at ≥10−8 M.

Simultaneous SERS detection of illegal food additives rhodamine B and basic orange II based on Au nanorod-incorporated melamine foam

2021 ◽  
pp. 129741
Author(s):  
Yingying Sun ◽  
Wan Li ◽  
Liqing Zhao ◽  
Fengyong Li ◽  
Yunfei Xie ◽  
...  
Keyword(s):  
Rhodamine B ◽  
Food Additives ◽  
Orange Ii ◽  
Sers Detection ◽  
Melamine Foam

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.

Ultrafast laser micro-nano structured superhydrophobic teflon surfaces for enhanced SERS detection via evaporation concentration

2020 ◽  
Vol 9 (1-2) ◽  
pp. 89-100 ◽  
Author(s):  
Xinyu Hu ◽  
Rui Pan ◽  
Mingyong Cai ◽  
Weijian Liu ◽  
Xiao Luo ◽  
...  
Keyword(s):  
Rhodamine 6G ◽  
Optimal Parameter ◽  
Solute Concentration ◽  
Processing Parameter ◽  
Detection Techniques ◽  
Peak Intensity ◽  
Target Analytes ◽  
Sers Detection ◽  
Scanning Path ◽  
Evaporation Concentration

AbstractEvaporation concentration of target analytes dissolved in a water droplet based on superhydrophobic surfaces could be able to break the limits for sensitive trace substance detection techniques (e.g. SERS) and it is promising in the fields such as food safety, eco-pollution, and bioscience. In the present study, polytetrafluoroethylene (PTFE) surfaces were processed by femtosecond laser and the corresponding processing parameter combinations were optimised to obtain surfaces with excellent superhydrophobicity. The optimal parameter combination is: laser power: 6.4 W; scanning spacing: 40 μm; scanning number: 1; and scanning path: 90 degree. For trapping and localising droplets, a tiny square area in the middle of the surface remained unprocessed for each sample. The evaporation and concentration processes of droplets on the optimised surfaces were performed and analyzed, respectively. It is shown that the droplets with targeted solute can successfully collect all solute into the designed trapping areas during evaporation process on our laser fabricated superhydrophobic surface, resulting in detection domains with high solute concentration for SERS characterisation. It is shown that the detected peak intensity of rhodamine 6G with a concentration of 10−6m in SERS characterisation can be obviously enhanced by one or two orders of magnitude on the laser fabricated surfaces compared with that of the unprocessed blank samples.

scholarly journals Universal Fabrication of Highly Efficient Plasmonic Thin‐Films for Label‐Free SERS Detection

Small ◽  
2021 ◽  
pp. 2100755
Author(s):  
Sara Gullace ◽  
Verónica Montes‐García ◽  
Victor Martín ◽  
David Larios ◽  
Valentina Girelli Consolaro ◽  
...  
Keyword(s):  
Thin Films ◽  
Label Free ◽  
Highly Efficient ◽  
Sers Detection

scholarly journals Geometry-induced enhancement factor improvement in covered-gold-nanorod-dimer antennas

RSC Advances ◽  
2021 ◽  
Vol 11 (16) ◽  
pp. 9518-9527
Author(s):  
Iván A. Ramos ◽  
L. M. León Hilario ◽  
María L. Pedano ◽  
Andres A. Reynoso
Keyword(s):  
Enhancement Factor ◽  
Gold Nanorod ◽  
Sers Detection ◽  
Nanorod Dimer

Designs with gold covering far from the gap area applied on nanorod-dimer antennas can enable hybrid electrical and SERS detection. Simulations show promising and robust increasement of the enhancement factor with respect to the uncovered dimer.

Multiscale structure enabled effective plasmon coupling and molecular enriching for SERS detection

2021 ◽  
Vol 544 ◽  
pp. 148908
Author(s):  
Jihua Xu ◽  
Yuan Si ◽  
Zhen Li ◽  
Shouzhen Jiang ◽  
Xianwu Xiu ◽  
...  
Keyword(s):  
Plasmon Coupling ◽  
Multiscale Structure ◽  
Sers Detection

Multiple weak interaction-assisted SERS detection platform for triadimefon

2014 ◽  
Vol 46 (1) ◽  
pp. 54-58 ◽  
Author(s):  
Ran Li ◽  
Peipei Liu ◽  
Shanshan Shen ◽  
Haiyang Wang ◽  
Haiming Lv ◽  
...  
Keyword(s):  
Weak Interaction ◽  
Sers Detection
Sign in / Sign up

Export Citation Format

Share Document