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Special Issue "Raman Spectroscopy: A Spectroscopic 'Swiss-Army Knife'"

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Analytical Chemistry".

Deadline for manuscript submissions: 15 December 2018

Special Issue Editor

Guest Editor
Prof. Dr. Keith C. Gordon

Department of Chemistry, University of Otago, Dunedin, New Zealand
Website | E-Mail
Interests: vibrational spectroscopy; chemometrics; Raman microscopy; low frequency Raman spectroscopy; resonance Raman spectroscopy; food analysis; electronic materials analysis

Special Issue Information

Dear Colleagues,

Since its first report by Raman and Krishnan in 1928, Raman spectroscopy has become an important form of vibrational spectroscopy in the physical and biological sciences. This Special Issue aims to encompass a number of diverse studies which exemplify the usefulness of this technique in these areas. This will include the use of Raman spectroscopy as an analytical tool in biological and materials sciences, as well as its use as a structural tool in molecular electronic materials and in dynamic systems—such as in photocatalysis.

In the effort to celebrate Raman spectroscopy, experts working with this technique are cordially invited to submit manuscripts. Particular interest is given to new innovations in the field that have enhanced the capability of Raman spectroscopy—on any type of sample.

Prof. Keith C. Gordon
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Molecules is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Raman spectroscopy
  • Raman microscopy
  • Imaging
  • Chemometrics
  • Surface-Enhance Raman
  • Spatially-Offset Raman
  • Two-Dimensional correlation

Published Papers (2 papers)

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Research

Open AccessArticle Strong Coupling of Folded Phonons with Plasmons in 6H-SiC Micro/Nanocrystals
Molecules 2018, 23(9), 2296; https://doi.org/10.3390/molecules23092296
Received: 4 August 2018 / Revised: 23 August 2018 / Accepted: 2 September 2018 / Published: 8 September 2018
PDF Full-text (1872 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
Silicon carbide (SiC) has a large number of polytypes of which 3C-, 4H-, 6H-SiC are most common. Since different polytypes have different energy gaps and electrical properties, it is important to identify and characterize various SiC polytypes. Here, Raman scattering is performed on
[...] Read more.
Silicon carbide (SiC) has a large number of polytypes of which 3C-, 4H-, 6H-SiC are most common. Since different polytypes have different energy gaps and electrical properties, it is important to identify and characterize various SiC polytypes. Here, Raman scattering is performed on 6H-SiC micro/nanocrystal (MNC) films to investigate all four folded transverse optic (TO) and longitudinal optic (LO) modes. With increasing film thickness, the four folded TO modes exhibit the same frequency downshift, whereas the four folded LO modes show a gradually-reduced downshift. For the same film thickness, all the folded modes show larger frequency downshifts with decreasing MNC size. Based on plasmons on MNCs, these folded modes can be attributed to strong coupling of the folded phonons with plasmons which show different strengths for the different folded modes while changing the film thickness and MNC size. This work provides a useful technique to identify SiC polytypes from Raman scattering. Full article
(This article belongs to the Special Issue Raman Spectroscopy: A Spectroscopic 'Swiss-Army Knife')
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Graphical abstract

Open AccessArticle Rapid Detection of Six Glucocorticoids Added Illegally to Dietary Supplements by Combining TLC with Spot-Concentrated Raman Scattering
Molecules 2018, 23(7), 1504; https://doi.org/10.3390/molecules23071504
Received: 16 May 2018 / Revised: 17 June 2018 / Accepted: 19 June 2018 / Published: 21 June 2018
PDF Full-text (4438 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
The objective of this study was to establish a novel method for rapid detection of six glucocorticoids (prednisone, prednisone acetate, prednisolone, hydrocortisone, hydrocortisone acetate, and dexamethasone) added illegally in dietary supplements simultaneously by combining thin layer chromatography (TLC) with spot-concentrated Raman scattering (SCRS).
[...] Read more.
The objective of this study was to establish a novel method for rapid detection of six glucocorticoids (prednisone, prednisone acetate, prednisolone, hydrocortisone, hydrocortisone acetate, and dexamethasone) added illegally in dietary supplements simultaneously by combining thin layer chromatography (TLC) with spot-concentrated Raman scattering (SCRS). The doping ingredients were separated by TLC, and viewed and located with UV light (254 nm), enriched by chromatography, then Raman spectra were directly detected by a Raman Imagine microscope with 780 nm laser source. This method had complementary advantages of TLC and Raman spectroscopy, which enhanced the specificity of the test results. The limit of detection (LOD) of the reference substances were 4 μg, 4 μg, 4 μg, 6 μg, 6 μg, and 4 μg, respectively. The method was used to study the six glucocorticoids added illegally in five dietary supplements. Fake drugs had been detected. The study showed that the TLC-SCRS method is simple, rapid, specific, sensitive, and reliable. The method could be used for effective separation and detection of six chemical components used in dietary supplement products, and would have good prospects for on-site qualitative screening of dietary supplement products for adulterants. Full article
(This article belongs to the Special Issue Raman Spectroscopy: A Spectroscopic 'Swiss-Army Knife')
Figures

Graphical abstract

Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Type: Article
Title: SERS-based determination of organophosphorus compounds
Author: Young Mee Jung
Affiliation: Department of Chemistry, Kangwon National University, Chunchon, Korea
Abstract: Organophosphorus compounds have been widely used as herbicides and insecticides in the agricultural industries and the excessive used of them has caused an environmental pollution. They have also been developed as nerve agents used in warfares and acts a terrorism. When nerve agents enters a human body, it can destroy the balance between the sympathetic nerve system and the parasympathetic nerve system, which causes fatal damage to the human body including sudden death. Therefore, it is very important to develop a rapid and effective detection method for such nerve agents. In this study, we utilized SERS technique, which provides a sensitive and effective method with a low detection limit, to develop a detection method for nerve agent simulants. This newly developed SERS-based detection method has been successfully confirmed to be feasible for the detection of nerve agent simulants.

 

Type: Article
Title: Understanding electrochemical reaction on cathode surface by using in situ Raman spectroelectrochemistry and two-dimensional correlation spectroscopy
Authors: Young Mee Jung 1 and Isao Noda 2
Affiliation: 1 Department of Chemistry, Kangwon National University, Chunchon, Korea
2 University of Delaware, USA
Abstract: Li-ion battery widely used nowadays for energy sources in devices, energy storages in electricity generation, memory backup, auxiliary power in electric vehicles, and so on. Therefore it is focused on the investigation for the improvement of electrochemical performance and the understanding of reaction mechanism of electrode and electrolyte in Li-ion battery. To exactly elucidate the working mechanism of Li-ion battery, the development of real time monitoring technique is of great importance. In this study, electrochemical reaction occurred cathode and electrolyte interface in Li-ion battery were monitored through in situ Raman spectroscopy and investigated by two-dimensional correlation spectroscopy and principal component analysis.

Type: Review
Title: Analysis of cellulose and lignocellulose materials by Raman spectroscopy: A review of the current status
Author: Umesh Agarwal
Affiliation: US Forest Service, Forest Products Laboratory

Title: Visualizing the microfibrils orientation distribution in moso bamboo by polarized laser Raman spectroscopy
Author: Jin Kexia, Feng Long, Liu Xinge, MA Jian-feng*
Affiliation: International Centre for Bamboo and Rattan, Key Lab of Bamboo and Rattan Science & Technology, Beijing 100102, China
Abstract The variation in the microfibrils orientation of the moso bamboo (Phyllostachys pubescens) multilayered fiber and parenchyma was studied by polarized laser Raman spectroscopy. Raman imaging revealed that the fiber secondary wall displayed a concentric structure with alternating broad and narrow layers, while parenchyma had no obvious layering structure partly due to the limited spatial resolution. Higher Raman C-O-C band intensity was visualized in the narrow layer of fiber wall, indicating the microfibrils in these regions were more parallel to the incident laser electric vector and more perpendicular to the cell axis (Fig.1). The microfibrils orientation in parenchyma is uniform within its secondary wall. Moreover, Raman band ratio (I1095/I2897) was used to predict microfibrils angle (MFA) in different cell wall types, qualitatively. The results showed that the ratio was highest in parenchyma, followed by narrow layer of fiber wall, and lowest in the broad layer of fiber wall, which indicated the higher MFA in the parenchyma. This study provided a novel method and important theoretical guidance for the investigation on cell wall architecture, chemical composition distribution and micromechanics.
Keywords: Moso bamboo;Cell wall layering structure; Microfibrils orientation;Polarized laser Raman spectroscopy

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