Raman studies of amorphous nanocarbon obtained by laser sputtering

Abstract The structural properties of amorphous nanocarbon films fabricated by laser sputtering of a graphite target are investigated by means of Raman spectroscopy. Analysis of the spectral features in the region of 100–3600 cm-1 allowed us to determine the allotrope composition of the films and the degree of disorder in terms of average crystallite size. The results obtained are important for application of such films in the field of electrode coatings.

Download Full-text

Corroboration of Structural Properties of Dy2O3-TiO2 Nanocomposites through X-Ray Diffraction and Raman Spectroscopy

Nano Hybrids and Composites ◽

10.4028/www.scientific.net/nhc.17.127 ◽

2017 ◽

Vol 17 ◽

pp. 127-130

Author(s):

J. Dhanalakshmi ◽

D. Pathinettam Padiyan

Keyword(s):

Raman Spectroscopy ◽

Crystallite Size ◽

Structural Properties ◽

Oxygen Vacancies ◽

Raman Band ◽

Anatase Phase ◽

Average Crystallite Size ◽

X Ray Diffraction ◽

X Ray ◽

Weight Percentage

Dy2O3-TiO2 nanocomposites with different weight percentage (0, 2, 4, 8 & 10)Dy were synthesized bysol-gel method and named as 0DT, 2DT, 4DT, 6DT, 8DT and 10DT. The structural properties of these nanocomposites are characterized by X-ray diffraction (XRD) and Raman spectroscopy. XRD results show that Dy2O3-TiO2 nanocomposites have anatase phase with tetragonal structure. The average crystallite size of the Dy2O3-TiO2 nanocomposites lies between 10 to 18 nm.Coupling of Dy with TiO2 shifts the Raman band to higher wavenumber side indicating the creation of oxygen vacancies in the TiO2 lattice.

Download Full-text

Raman spectroscopy analysis utilized to identify stress induced leakage from power and high speed technologies using deep trench isolation schemes

2017 40th International Convention on Information and Communication Technology, Electronics and Microelectronics (MIPRO) ◽

10.23919/mipro.2017.7966537 ◽

2017 ◽

Author(s):

Courtney Parker ◽

Thanas Budri

Keyword(s):

Raman Spectroscopy ◽

High Speed ◽

Spectroscopy Analysis ◽

Deep Trench ◽

Trench Isolation

Download Full-text

Use of WetSEM® capsules for convenient multimodal scanning electron microscopy, energy dispersive X-ray analysis, and micro Raman spectroscopy characterisation of technetium oxides

Journal of Radioanalytical and Nuclear Chemistry ◽

10.1007/s10967-021-07737-5 ◽

2021 ◽

Author(s):

D. J. Bailey ◽

M. C. Stennett ◽

J. Heo ◽

N. C. Hyatt

Keyword(s):

Raman Spectroscopy ◽

Low Cost ◽

Powder Materials ◽

Spectroscopy Analysis ◽

X Ray ◽

Micro Raman Spectroscopy ◽

Hazard And Risk ◽

Sem Imaging ◽

General User ◽

532 Nm

AbstractSEM–EDX and Raman spectroscopy analysis of radioactive compounds is often restricted to dedicated instrumentation, within radiological working areas, to manage the hazard and risk of contamination. Here, we demonstrate application of WetSEM® capsules for containment of technetium powder materials, enabling routine multimodal characterisation with general user instrumentation, outside of a controlled radiological working area. The electron transparent membrane of WetSEM® capsules enables SEM imaging of submicron non-conducting technetium powders and acquisition of Tc Lα X-ray emission, using a low cost desktop SEM–EDX system, as well as acquisition of good quality μ-Raman spectra using a 532 nm laser.

Download Full-text

Structural and Technological Approach to Reveal the Role of the Lipid Phase in the Formation of Soy Emulsion Gels with Chia Oil

Gels ◽

10.3390/gels7020048 ◽

2021 ◽

Vol 7 (2) ◽

pp. 48

Author(s):

Ana M. Herrero ◽

Claudia Ruiz-Capillas

Keyword(s):

Raman Spectroscopy ◽

Structural Properties ◽

Structural Changes ◽

Protein Secondary Structure ◽

Lipid Phase ◽

Α Helix ◽

Β Sheet ◽

Shed Light ◽

Chia Oil

Considerable attention has been paid to emulsion gels (EGs) in recent years due to their interesting applications in food. The aim of this work is to shed light on the role played by chia oil in the technological and structural properties of EGs made from soy protein isolates (SPI) and alginate. Two systems were studied: oil-free SPI gels (SPI/G) and the corresponding SPI EGs (SPI/EG) that contain chia oil. The proximate composition, technological properties (syneresis, pH, color and texture) and structural properties using Raman spectroscopy were determined for SPI/G and SPI/EG. No noticeable (p > 0.05) syneresis was observed in either sample. The pH values were similar (p > 0.05) for SPI/G and SPI/EG, but their texture and color differed significantly depending on the presence of chia oil. SPI/EG featured significantly lower redness and more lightness and yellowness and exhibited greater puncture and gel strengths than SPI/G. Raman spectroscopy revealed significant changes in the protein secondary structure, i.e., higher (p < 0.05) α-helix and lower (p < 0.05) β-sheet, turn and unordered structures, after the incorporation of chia oil to form the corresponding SPI/EG. Apparently, there is a correlation between these structural changes and the textural modifications observed.

Download Full-text

High-pressure structural phase transition and metallization in Ga2S3 under non-hydrostatic and hydrostatic conditions up to 36.4 GPa

Journal of Materials Chemistry C ◽

10.1039/d0tc06004f ◽

2021 ◽

Author(s):

Linfei Yang ◽

Jianjun Jiang ◽

Lidong Dai ◽

Haiying Hu ◽

Meiling Hong ◽

...

Keyword(s):

Phase Transition ◽

Raman Spectroscopy ◽

High Pressure ◽

Structural Properties ◽

Structural Phase Transition ◽

First Principles ◽

Theoretical Calculations ◽

Structural Phase

The vibrational, electrical and structural properties of Ga2S3 were explored by Raman spectroscopy, EC measurements, HRTEM and First-principles theoretical calculations under different pressure environments up to 36.4 GPa.

Download Full-text

Crystal structure and magnetic properties study on barium hexaferrite of different average crystallite size

Applied Physics A ◽

10.1007/s00339-020-04232-8 ◽

2021 ◽

Vol 127 (2) ◽

Author(s):

Murli Kumar Manglam ◽

Suman Kumari ◽

Jyotirekha Mallick ◽

Manoranjan Kar

Keyword(s):

Crystal Structure ◽

Magnetic Properties ◽

Crystallite Size ◽

Barium Hexaferrite ◽

Average Crystallite Size

Download Full-text

Influence of Preparation Temperature on Performance of Ce1-xPrxO2 Ultrafine Powder Prepared by a Microemulsion Process

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.368-372.784 ◽

2008 ◽

Vol 368-372 ◽

pp. 784-786 ◽

Cited By ~ 1

Author(s):

Jun Yang ◽

Zhen Feng Zhu ◽

Jing Ping Li

Keyword(s):

Crystallite Size ◽

Calcination Temperature ◽

Average Crystallite Size ◽

Ultrafine Powder ◽

Microemulsion System ◽

Sem Images ◽

Preparation Temperature ◽

Annealing Conditions

A W/O microemulsion system composed of OP-emolsifier / water / cyclohexane / 1-Pentanol was adopted to prepare ultrafine Ce1-xPrxO2 powder via the reaction between the precipitants of cerium and praseodymium salt solved in the nano reactors. The influence of the annealing conditions on the preparation of Ce1-xPrxO2 powder was investigated. It was shown that, with the increase of calcination temperature from 400 °C to 800 °C, the average crystallite size of the particles increases from 9.5 nm to 25.8 nm. FE-SEM images showed that shape of the particles is layered and sheet-like.

Download Full-text