Effects of surface roughness of Ag thin films on surface-enhanced Raman spectroscopy of graphene: spatial nonlocality and physisorption strain

Nanoscale ◽  
2014 ◽  
Vol 6 (3) ◽  
pp. 1311-1317 ◽  
Author(s):  
Yuda Zhao ◽  
Xin Liu ◽  
Dang Yuan Lei ◽  
Yang Chai
Keyword(s):  
Thin Films ◽  
Surface Roughness ◽  
Raman Spectroscopy ◽  
Surface Enhanced Raman Spectroscopy ◽  
Spatial Nonlocality ◽  
Surface Enhanced ◽  
Surface Enhanced Raman

Surface enhanced Raman spectroscopy by titanium nitride non-continuous thin films

2013 ◽  
Vol 531 ◽  
pp. 144-146 ◽  
Author(s):  
I. Lorite ◽  
A. Serrano ◽  
A. Schwartzberg ◽  
J. Bueno ◽  
J.L. Costa-Krämer
Keyword(s):  
Thin Films ◽  
Raman Spectroscopy ◽  
Titanium Nitride ◽  
Surface Enhanced Raman Spectroscopy ◽  
Surface Enhanced ◽  
Surface Enhanced Raman

scholarly journals Ag@Au Core–Shell Porous Nanocages with Outstanding SERS Activity for Highly Sensitive SERS Immunoassay

Sensors ◽  
2019 ◽  
Vol 19 (7) ◽  
pp. 1554 ◽  
Author(s):  
Yaqi Huang ◽  
Dajie Lin ◽  
Mengting Li ◽  
Dewu Yin ◽  
Shun Wang ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Raman Spectroscopy ◽  
Hot Spots ◽  
Signal Amplification ◽  
Surface Enhanced Raman Spectroscopy ◽  
Core Shell ◽  
Chloroauric Acid ◽  
Highly Sensitive ◽  
Surface Enhanced ◽  
Surface Enhanced Raman

A highly sensitive immunoassay of biomarkers has been achieved using 4-mercaptobenzoic acid-labeled Ag@Au core–shell porous nanocage tags and α-fetoprotein immuno-sensing chips. The Ag@Au porous nanocages were uniquely synthesized by using an Ag core as a self-sacrificial template and reducing agent, where the slow reaction process led to the formation of a porous Au layer. The size of the remaining Ag core and surface roughness of the Au shell were controlled by adjusting the chloroauric acid concentration. The porous cage exhibited excellent surface-enhanced Raman spectroscopy (SERS) activity, presumably due to a synergetic interaction between newly generated hot spots in the rough Au shell and the retained SERS activity of the Ag core. Using α-fetoprotein as a model analyte for immunoassay, the SERS signal had a wide linear range of 0.20 ng mL−1 to 500.0 ng mL−1 with a detection limit of 0.12 ng mL−1. Without the need of further signal amplification, the as-prepared Ag@Au bimetallic nanocages can be directly used for highly sensitive SERS assays of other biomarkers in biomedical research, diagnostics, etc.

scholarly journals Controlled positioning of analytes and cells on a plasmonic platform for glycan sensing using surface enhanced Raman spectroscopy

2016 ◽  
Vol 7 (1) ◽  
pp. 575-582 ◽  
Author(s):  
Mohammadali Tabatabaei ◽  
Gregory Q. Wallace ◽  
Fabiana A. Caetano ◽  
Elizabeth R. Gillies ◽  
Stephen S. G. Ferguson ◽  
...  
Keyword(s):  
Thin Films ◽  
Raman Spectroscopy ◽  
Polymer Thin Films ◽  
Surface Enhanced Raman Spectroscopy ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Fluorocarbon Polymer ◽  
Cell Positioning

Controlled analyte and cell positioning is enabled on a plasmonic platform with patterned fluorocarbon polymer thin films for SERS-based glycan sensing.

scholarly journals Detection of overtone and combined peaks using Mn/Cu helical star-shaped (pine-tree-like) sculptured thin films in surface-enhanced Raman spectroscopy

2019 ◽  
Vol 13 (4) ◽  
pp. 305-314
Author(s):  
Reza Babaei ◽  
Shokoofe Goli-Haghighi ◽  
Hadi Savaloni
Keyword(s):  
Thin Films ◽  
Raman Spectroscopy ◽  
Surface Enhanced Raman Spectroscopy ◽  
Laser Wavelength ◽  
Oblique Angle Deposition ◽  
Sculptured Thin Films ◽  
Pine Tree ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Ring Mode

Abstract Mn helical star-shaped (pine-tree-like) nano-sculptured thin films with three-, four-and fivefold symmetry on copper substrates were produced using oblique angle deposition method in conjunction with rotation of sample holder at certain angles. Raman spectroscopy of the samples which were subjected to impregnation by 4,4′-bipyridine (C10H8N2) solution was carried out by 632.8 nm wavelength laser. The analysis of the Raman spectra showed enhancement for the 4,4′-bipyridine main bands (1592 and 1297 cm−1) belonging to the C=C stretching mode, aromatic ring stretching ring and in-plane ring mode of 4,4′-bipyridine, same as results obtained for Ag nano-structures. In addition, overtone and combined peaks are detected that may be related to the particular sculptured structure of the thin films fabricated in this work and the laser wavelength used for Raman spectroscopy. UV–Vis (absorption mode) spectra showed consistent observations with the SERS results leading to important role of surface electromagnetic selection rule in intensification of SERS, in addition pointing out the importance of the effect of the size of hot spots on the frequency of the localized surface plasmonic oscillations.

scholarly journals Highly sensitive and specific detection of E. coli by a SERS nanobiosensor chip utilizing metallic nanosculptured thin films

The Analyst ◽  
2015 ◽  
Vol 140 (9) ◽  
pp. 3201-3209 ◽  
Author(s):  
Sachin K. Srivastava ◽  
Hilla Ben Hamo ◽  
Ariel Kushmaro ◽  
Robert S. Marks ◽  
Christoph Grüner ◽  
...  
Keyword(s):  
Thin Films ◽  
Escherichia Coli ◽  
Raman Spectroscopy ◽  
Concentration Level ◽  
Surface Enhanced Raman Spectroscopy ◽  
Specific Detection ◽  
E Coli ◽  
Highly Sensitive ◽  
Surface Enhanced ◽  
Surface Enhanced Raman

A nanobiosensor chip, utilizing surface enhanced Raman spectroscopy on nanosculptured thin films of silver, was shown to detectEscherichia colibacteria down to the concentration level of a single bacterium.

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