Investigation of the chemical origin and evidential value of differences in the SERS spectra of blue gel inks

The Analyst ◽  
2016 ◽  
Vol 141 (17) ◽  
pp. 5152-5158 ◽  
Author(s):  
Yen Cheng Ho ◽  
Wendy W. Y. Lee ◽  
Steven E. J. Bell
Keyword(s):  
Polymer Films ◽  
Resonance Raman ◽  
High Signal ◽  
Ag Nanoparticle ◽  
Signal Noise ◽  
Evidential Value ◽  
Surface Enhanced ◽  
Nanoparticle Aggregates ◽  
Very High

Highly swellable polymer films doped with Ag nanoparticle aggregates (poly-SERS films) have been used to record very high signal : noise ratio, reproducible surface-enhanced resonance Raman (SERRS) spectra of in situ dried ink lines and their constituent dyes using both 633 and 785 nm excitation.

A New Pre-Embedding Immunogold Method That Permits to Obtain a Very High Signal with a Very Good Ultrastucture

2001 ◽  
Vol 7 (S2) ◽  
pp. 1044-1045
Author(s):  
G. Grondin ◽  
A.R. Bcaudoin
Keyword(s):  
New Technologies ◽  
Immunofluorescence Microscopy ◽  
High Signal ◽  
Sodium Metaperiodate ◽  
Two Photon ◽  
Cacodylate Buffer ◽  
Ultrastructure Preservation ◽  
High Level ◽  
Very High

The ultimate goal of the immunocytochemistry is to get the best signal with the lowest background while preserving ultrastructure. Unfortunaly too often the experimentator faces a compromise between density of the signal and ultrastructure preservation (1). with the advent of hight resolution confocal light microscopy, two photon imaging and other new technologies there is a need to provide the best immunocytochemical complementary results with the high resolution of the electron microscope. But often for exemple the high level of labelling observed by immunofluorescence microscopy is not matched by immunocytochemistry (2). One approach to obtain comparable levels of labelling is to use comparable protocols. We propose here such a new immunogold method. to illustrate our point we used a very convenient biological material, the adherent cells grown on 35 mm plastic culture dishes. The following procedure was applied : Confluent endothelial cells were fixed in situ for 3 hours with the following freshly prepared and filtered solution : 1 % 1-lysine, 4% paraformaldehyde, 0.04% glutaraldehyde, 0.25% sodium metaperiodate in 0.04M sodium cacodylate buffer, pH 7.4.

Surface-Enhanced Resonance Raman Scattering of Black Inkjet Dyes in Solution and in Situ Printed onto Paper

2003 ◽  
Vol 57 (8) ◽  
pp. 977-983 ◽  
Author(s):  
R. E. Littleford ◽  
M. P. Hughes ◽  
G. Dent ◽  
D. Tackley ◽  
W. E. Smith
Keyword(s):  
Raman Scattering ◽  
Structural Changes ◽  
Resonance Raman ◽  
High Energy ◽  
Silver Particles ◽  
Resonance Raman Scattering ◽  
Surface Enhanced ◽  
Spectroscopic Information ◽  
Structure Calculations

Understanding the changes that occur when dyes are absorbed onto paper is crucial for the design of new inkjet dyes. This problem is particularly difficult for black dyes that have complex chromophores, and as a result, spectroscopic information on electronic and structural changes can be of importance. Surface-enhanced resonance Raman scattering (SERRS) and electronic structure calculations were used to probe in situ changes in the chromophore in black di-azo dyes printed onto paper. The data indicate that the low-energy chromophore is due mainly to the hydrazone group and the high-energy chromophore to both the azo and hydrazone groups. A comparison of SERRS from the dyes adsorbed onto silver particles in suspension and from the dyes on paper demonstrated a broadening of the chromophore into the red for both dyes and evidence of a structural change in one dye.

Synthesis and Near-Field Enhancement of Composite Nanoarrays Based on Electrodeposition and in Situ Reaction

NANO ◽  
2021 ◽  
Author(s):  
Jing Wu ◽  
Jiali Shen ◽  
Jinghuai Fang ◽  
Lu Xu
Keyword(s):  
Synergistic Effect ◽  
Raman Scattering ◽  
Surface Enhanced Raman Scattering ◽  
Metal Nanostructures ◽  
Nanoparticle Arrays ◽  
Ag Nanoparticle ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Since the morphology and element composition of metal nanostructures strongly affect the surface plasma oscillation characteristics, it has been widely concerned in surface enhanced Raman scattering (SERS). Herein, we proposed a novel route to fabricate composite Au/Ag nanoparticle arrays with synergistic effect for electromagnetic enhancement. Ag nanoparticles were electrodeposited onto a home-made template with highly ordered bowl-like pits. After a novel method of “confined annealing”, we further achieved well-regulated spherical Ag NP arrays, and the composite Au/Ag nanoparticle arrays were finally obtained via in situ replacement. The fabricated composite nanostructures showed stable and sensitive surface enhanced Raman scattering (SERS) performance mainly due to the synergistic effect and abundant “hot spots”, with the enhancement factor (EF) of [Formula: see text] for crystal violet (CV) molecules. In addition, this simple and effective preparation process greatly improved the uniformity of three-dimensional nanostructures, providing a new idea for further improving the stability of SERS signals.

scholarly journals Surface-enhanced Raman spectroscopy of novel psychoactive substances using polymer-stabilized Ag nanoparticle aggregates

2016 ◽  
Vol 52 (3) ◽  
pp. 493-496 ◽  
Author(s):  
W. W. Y. Lee ◽  
V. A. D. Silverson ◽  
L. E. Jones ◽  
Y. C. Ho ◽  
N. C. Fletcher ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Surface Enhanced Raman Spectroscopy ◽  
Novel Psychoactive Substances ◽  
Ag Nanoparticle ◽  
Psychoactive Substances ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Nanoparticle Aggregates ◽  
Legal High ◽  
Polymer Stabilized

A set of seized “legal high” samples and pure novel psychoactive substances have been examined by surface-enhanced Raman spectroscopy using polymer-stabilized Ag nanoparticle (Poly-SERS) films.

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