scholarly journals Microcavity Enhanced Raman Spectroscopy of Fullerene C60 Bucky Balls

Sensors ◽  
2020 ◽  
Vol 20 (5) ◽  
pp. 1470 ◽  
Author(s):  
Vinayaka H. Damle ◽  
Miri Sinwani ◽  
Hagit Aviv ◽  
Yaakov R. Tischler
Keyword(s):  
Raman Spectroscopy ◽  
Low Cost ◽  
Spectroscopic Characterization ◽  
Low Energy ◽  
Cavity Resonance ◽  
Raman Spectroscopic ◽  
Raman Enhancement ◽  
Raman Modes ◽  
Selective Enhancement ◽  
Non Destructive

Raman spectroscopy is a widely used characterization technique in material science. It is a non-destructive tool with relatively simple instrumentation, and provides intrinsic qualitative information of analytes by probing their vibrational modes. In many cases, Raman enhancement is essential for detecting low-intensity signals in high-noise environments, spectrally unresolved features, and hidden modes. Here we present optical and Raman spectroscopic characterization of fullerene C 60 in a gold microcavity. The fabrication of single-layered gold mirrors is facile, low cost and direct but was proven to give considerably significant enhancement. The findings of this work demonstrate the cavity resonance as a powerful tool in obtaining tunability over individual peak for selective enhancement in the tuned spectral range. The PL of the material within the cavity has demonstrated a red shift assumed to be caused by the low-energy transitions. These transitions are induced by virtual low-energy states generated by the cavity. We further observe that adopting this principle enables resolution of active Raman modes that until now were unobserved. Finally, we assigned the new experimentally observed modes to the corresponding motions calculated by DFT.

scholarly journals Raman spectroscopy as a tool for ecology and evolution

2017 ◽  
Vol 14 (131) ◽  
pp. 20170174 ◽  
Author(s):  
Arno Germond ◽  
Vipin Kumar ◽  
Taro Ichimura ◽  
Jerome Moreau ◽  
Chikara Furusawa ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Low Cost ◽  
Biological Systems ◽  
Spectral Information ◽  
Selective Pressures ◽  
Biological Features ◽  
Microscopy Technique ◽  
Pragmatic Aspects ◽  
Non Destructive

Scientists are always on the lookout for new modalities of information which could reveal new biological features that are useful for deciphering the complexity of biological systems. Here, we introduce Raman spectroscopy as a prime candidate for ecology and evolution. To encourage the integration of this microscopy technique in the field of ecology and evolution, it is crucial to discuss first how Raman spectroscopy fits within the conceptual, technical and pragmatic considerations of ecology and evolution. In this paper, we show that the spectral information holds reliable indicators of intra- and interspecies variations, which can be related to the environment, selective pressures and fitness. Moreover, we show how the technical and pragmatic aspects of this modality (non-destructive, non-labelling, speed, relative low cost, etc.) enable it to be combined with more conventional methodologies. With this paper, we hope to open new avenues of research and extend the scope of available methodologies used in ecology and evolution.

scholarly journals Micro-Raman Spectroscopy Assessment of Chemical Compounds of Mantle Clinopyroxenes

Minerals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1084
Author(s):  
Anastasiya D. Kalugina ◽  
Dmitry A. Zedgenizov
Keyword(s):  
Raman Spectroscopy ◽  
Chemical Composition ◽  
Chemical Compounds ◽  
Peak Position ◽  
Mantle Xenoliths ◽  
Wide Range ◽  
Stretching Vibration ◽  
Raman Modes ◽  
Non Destructive ◽  
Heterovalent Isomorphism

The composition of clinopyroxenes is indicative for chemical and physical properties of mantle substrates. In this study, we present the results of Raman spectroscopy examination of clinopyroxene inclusions in natural diamonds (n = 51) and clinopyroxenes from mantle xenoliths of peridotites and eclogites from kimberlites (n = 28). The chemical composition of studied clinopyroxenes shows wide variations indicating their origin in different mantle lithologies. All clinopyroxenes have intense Raman modes corresponding to metal-oxygen translation (~300–500 cm−1), stretching vibrations of bridging O-Si-Obr (ν11~670 cm−1), and nonbridging atoms O-Si-Onbr (ν16~1000 cm−1). The peak position of the stretching vibration mode (ν11) for the studied clinopyroxenes varies in a wide range (23 cm−1) and generally correlates with their chemical composition and reflects the diopside-jadeite heterovalent isomorphism. These correlations may be used for rough estimation of these compounds using the non-destructive Raman spectroscopy technique.

scholarly journals Raman spectroscopic characterization of selenite reduction by the bacterium Azospirillum thiophilum in the presence of an increased concentration of sulphate

2020 ◽  
Author(s):  
A. A. Vladimirova ◽  
A. A. Kamnev ◽  
A. V. Tugarova
Keyword(s):  
Raman Spectroscopy ◽  
Spectroscopic Characterization ◽  
Selenite Reduction ◽  
Raman Spectroscopic

In the biomass of A. thiophilum BV-S grown in the presence of 7 mM Na2SO4, Raman spectroscopy showed a peak at 348 cm–1 (Se–S bond) in addition to a peak at 250 cm–1 (amorphous modification of Se).

Raman Spectroscopic Characterization of Hepatic Differentiation of Mesenchymal Stem Cells

2021 ◽  
Author(s):  
Sareh Arjmand ◽  
Aram Barzegar ◽  
Alemeh Mohammadpour ◽  
Hanieh Rezaei ◽  
Nahid Davoodian ◽  
...  
Keyword(s):  
Stem Cells ◽  
Raman Spectroscopy ◽  
Mesenchymal Stem Cells ◽  
Raman Spectra ◽  
Spectroscopic Characterization ◽  
Positive Control ◽  
Hepatic Differentiation ◽  
Raman Spectroscopic ◽  
Free Quartz ◽  
Differentiation Status

Background and Aims: Mesenchymal stem cells (MSCs) are a preferred cell source for the generation of hepatocyte-like cells in regenerative medicine. They can be isolated from different sources, including adipose tissues. The Raman spectroscopy approach was evaluated for quick and efficient identification of MSCs differentiation status and a broader perspective on cell differentiation. Materials and Methods: The human adipose-derived mesenchymal stem cells (hASCs) were differentiated toward hepatocyte-like cells using a well-established method. The cells were cultured on fluorescence-free quartz discs, and the efficiency of differentiation was examined using molecular and biochemical methods. The Raman spectra were recorded at days 1, 7, 14, and 21 of differentiation, and HepG2 was used as a positive control. Results: The changes in Raman spectra were detected during the sequential stages of differentiation, and the pattern of peaks on the last day of differentiation was remarkably similar to the positive control (HepG2). Conclusion: Raman spectroscopy showed considerable potential to characterize hepatic differentiation.

Raman spectroscopic characterization of submicron vapor-grown carbon fibers and carbon nanofibers obtained by pyrolyzing hydrocarbons

1999 ◽  
Vol 14 (12) ◽  
pp. 4474-4477 ◽  
Author(s):  
M. Endo ◽  
K. Nishimura ◽  
Y. A. Kim ◽  
K. Hakamada ◽  
T. Matushita ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Raman Spectroscopy ◽  
Carbon Nanofibers ◽  
Carbon Fibers ◽  
Spectroscopic Characterization ◽  
Treatment Temperature ◽  
Two Dimensional ◽  
Raman Spectroscopic ◽  
Main Transition

Variations of the properties of submicron vapor-grown carbon fibers (VGCFs) and nanofibers, with diameters around 0.1–0.2 μm and 80–100 nm, respectively, are observed by Raman spectroscopy as a function of heat-treatment temperature. The microstructural evolution strongly depends on the original properties of the material, such that the main transition temperatures associated with the onset for establishing two-dimensional graphene ordering are defined below 1500 °C for the nanofibers and 2000 °C for the submicron VGCFs, respectively. The relative intensities (ID/IG) of the as-grown phase for submicron VGCFs and nanofibers are 3.44 and 1.35, while those for the corresponding graphitized samples are 0.393 and 0.497, respectively.

Raman Spectroscopic Characterization of Melanoma and Benign Melanocytic Lesions Suspected of Melanoma Using High-Wavenumber Raman Spectroscopy

2016 ◽  
Vol 88 (15) ◽  
pp. 7683-7688 ◽  
Author(s):  
Inês P. Santos ◽  
Peter J. Caspers ◽  
Tom C. Bakker Schut ◽  
Remco van Doorn ◽  
Vincent Noordhoek Hegt ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Spectroscopic Characterization ◽  
Raman Spectroscopic ◽  
Melanocytic Lesions

Near-infrared Raman spectroscopy for assessing biochemical changes of cervical tissue associated with precarcinogenic transformation

The Analyst ◽  
2014 ◽  
Vol 139 (21) ◽  
pp. 5379-5386 ◽  
Author(s):  
Shiyamala Duraipandian ◽  
Jianhua Mo ◽  
Wei Zheng ◽  
Zhiwei Huang
Keyword(s):  
Raman Spectroscopy ◽  
Near Infrared ◽  
Spectroscopic Characterization ◽  
Biochemical Changes ◽  
Cervical Tissue ◽  
Raman Spectroscopic

NIR Raman spectroscopic characterization of cervical precarcinogenic transformation.

scholarly journals Identification of ceftazidime interaction with bacteria in wastewater treatment by Raman spectroscopic mapping

RSC Advances ◽  
2019 ◽  
Vol 9 (56) ◽  
pp. 32744-32752
Author(s):  
Meng-Wen Peng ◽  
Xiang-Yang Wei ◽  
Qiang Yu ◽  
Peng Yan ◽  
You-Peng Chen ◽  
...  
Keyword(s):  
Biological Sciences ◽  
Raman Spectroscopy ◽  
Wastewater Treatment ◽  
Aqueous Environment ◽  
Raman Spectroscopic ◽  
Non Invasive ◽  
Non Destructive

Raman spectroscopy yields a fingerprint spectrum and is of great importance in medical and biological sciences as it is non-destructive, non-invasive, and available in the aqueous environment.

Raman Spectroscopic Characterization of Carbon Nanofibers Obtained by Using Metal Chloride as Catalyst Precursor

2007 ◽  
Vol 561-565 ◽  
pp. 1387-1390
Author(s):  
Fei Li ◽  
Xiao Ping Zou ◽  
Jin Cheng ◽  
Hong Dan Zhang ◽  
Peng Fei Ren ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Carbon Nanofibers ◽  
Amorphous Carbon ◽  
Spectroscopic Characterization ◽  
Copper Plate ◽  
Metal Chloride ◽  
Catalyst Precursor ◽  
Raman Spectroscopic ◽  
Degree Of Graphitization

Carbon nanofibers have been obtained by the interaction of ethanol with metal chloride over copper plate. Different metal chloride was used as the catalyst precursor. The products were characterized by the Raman spectroscopy for the degree of graphitization. The relative intensities and the amount of amorphous carbon were estimated. The results indicate that the catalyst precursor has effects on the degree of graphitization of carbon nanofibers.

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