A case study: effect of defects in CVD-grown graphene on graphene enhanced Raman spectroscopy

RSC Advances ◽  
2015 ◽  
Vol 5 (77) ◽  
pp. 62772-62777 ◽  
Author(s):  
Jong-Chul Yoon ◽  
Pradheep Thiyagarajan ◽  
Hyo-Jin Ahn ◽  
Ji-Hyun Jang
Keyword(s):  
Raman Spectroscopy ◽  
Signal Enhancement ◽  
Grown Graphene

PMMA-transferred graphene provides much larger GERS signal enhancement than TRT-transferred graphene.

scholarly journals Raman investigation of corrosion products on Roman copper-based artefacts

ACTA IMEKO ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 129
Author(s):  
Leila Es Sebar ◽  
Leonardo Iannucci ◽  
Yuval Goren ◽  
Peter Fabian ◽  
Emma Angelini ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Principal Components Analysis ◽  
Principal Components ◽  
Roman Period ◽  
Corrosion Products ◽  
Beer Sheva ◽  
Chemometric Technique ◽  
Components Analysis ◽  
Main Components

<p class="Abstract">This paper illustrates a case study related to the characterisation of corrosion products present on recently excavated artefacts. The archaeological findings, from the Rakafot 54 site (Beer-Sheva, Israel), consist of 23 coins and a pendant, all dating back to the Roman period. Raman spectroscopy was used to identify the corrosion products that compose the patina covering the objects. To facilitate and support their identification, spectra were then processed using principal components analysis. This chemometric technique allowed the identification of two main compounds, classified as atacamite and clinoatacamite, which formed the main components of the patinas. The results of this investigation can help in assessing the conservation state of artefacts and defining the correct restoration strategy.</p>

scholarly journals Advantages and disadvantages of Raman spectroscopy in testing paper banknotes

2019 ◽  
Vol 13 (3) ◽  
pp. 226-229 ◽  
Author(s):  
Gordana Jauković
Keyword(s):  
Physical Chemistry ◽  
Raman Spectroscopy ◽  
Wave Length ◽  
Raman Signal ◽  
Raman Spectrometer ◽  
Advantages And Disadvantages ◽  
Private Collection ◽  
Spectrum Characteristic

This paper presents advantages and disadvantages of Raman spectroscopy when used for testing banknotes, i.e. in case study I, 1 and 5 dinars banknotes from a private collection dating from 1876 of numismatic value were analyzed, and in case study II, 1000 dinars banknote from circulation together with its counterfeit. In both cases banknotes were analyzed by using Raman spectrometer DXR Raman microscope at the Faculty of Physical Chemistry, with a laser of wave-length 780 nm at 12 mW of power. Specters were recorded under microscope using 50X lens in a range 1800-60 cm-1. Analyses from case study I on both specimens showed spectrum characteristic for fluorescence appearance, therefore intensive signal of fluorescence covered Raman signal. In case study II, it was established that Raman spectroscopy can reliably detect a counterfeit banknote. Research, comparisons and analyses regarding original and counterfeit 1000 dinars note were performed on red banknote surfaces.

scholarly journals Early Warning of Biological Threats via Surface-Enhanced Raman Spectroscopy: A Case Study of Bacillus Spores

Challenges ◽  
2016 ◽  
Vol 7 (2) ◽  
pp. 24
Author(s):  
Antonia Lai ◽  
Salvatore Almaviva ◽  
Valeria Spizzichino ◽  
Domenico Luciani
Keyword(s):  
Raman Spectroscopy ◽  
Early Warning ◽  
Surface Enhanced Raman Spectroscopy ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Bacillus Spores

scholarly journals BEACHROCKS CEMENT CHARACTERISTICS AND CONDITIONS OF FORMATION. CASE STUDY PLATANIAS BEACH, CHANIA, GREECE

2017 ◽  
Vol 50 (1) ◽  
pp. 458
Author(s):  
A. Petropoulos ◽  
I. Baziotis ◽  
Ch. Anagnostou ◽  
N. Evelpidou
Keyword(s):  
Electron Microscopy ◽  
Raman Spectroscopy ◽  
Optical Microscopy ◽  
Secondary Electron ◽  
Coastal Sediment ◽  
Intertidal Area ◽  
Cement Material

Beachrocks represents a coastal deposition in the intertidal area, and studying their properties may lead to create a model which identifies the conditions of their formation (paleo-environment). This paper focuses most intently on the cement material which is able to recover the paleo-environment conditions during diagenesis of such coastal sediment. We used optical microscopy, secondary electron microscopy and Raman Spectroscopy to characterize the cement texture, mineralogy and chemistry in the beachrocks. The existence of pure calcite primarily controlled by the meteorite water, while Mg-calcite appears between the lowermeteoric and the upper marine phreatic zone. Finally, the presence of aragonite associated with the marine phreatic to lower marine vadose environment.

scholarly journals Role of multipolar plasmon resonances during surface-enhanced Raman spectroscopy on Au micro-patches

RSC Advances ◽  
2016 ◽  
Vol 6 (116) ◽  
pp. 115284-115289 ◽  
Author(s):  
Annette Dowd ◽  
Mathias Geisler ◽  
Shaoli Zhu ◽  
Michelle L. Wood ◽  
Michael B. Cortie
Keyword(s):  
Raman Spectroscopy ◽  
Surface Enhanced Raman Spectroscopy ◽  
Signal Enhancement ◽  
Raman Signal ◽  
Surface Enhanced ◽  
Plasmon Resonances ◽  
Surface Enhanced Raman

Large more reproducibly fabricated microstructures can also provide significant Raman signal enhancementviausually neglected multipolar plasmon resonances.

scholarly journals Step-by-step monitoring of CVD-graphene during wet transfer by Raman spectroscopy

RSC Advances ◽  
2019 ◽  
Vol 9 (71) ◽  
pp. 41447-41452 ◽  
Author(s):  
Zehao Wu ◽  
Xuewei Zhang ◽  
Atanu Das ◽  
Jinglan Liu ◽  
Zhenxing Zou ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Si Substrate ◽  
Cvd Graphene ◽  
Grown Graphene

The quality evolution of as-grown graphene during wet transfer from Cu to SiO2/Si substrate is investigated by Raman spectroscopy and the relavant factors during this process are identified.

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