Controlled high temperature stability of microwave plasma synthesized graphene nanosheets
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F21%3A00118853" target="_blank" >RIV/00216224:14310/21:00118853 - isvavai.cz</a>
Alternative codes found
RIV/00216305:26310/21:PU139658
Result on the web
<a href="https://doi.org/10.1088/1361-6463/abdb6d" target="_blank" >https://doi.org/10.1088/1361-6463/abdb6d</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1088/1361-6463/abdb6d" target="_blank" >10.1088/1361-6463/abdb6d</a>
Alternative languages
Result language
angličtina
Original language name
Controlled high temperature stability of microwave plasma synthesized graphene nanosheets
Original language description
High temperature stability of nanomaterials plays an important role for their application in the field of nanocomposites, batteries, and sensors. Few-layer graphene nanosheets prepared by microwave plasma based decomposition of ethanol exhibited high thermal stability in the oxidation atmosphere in dependence on controlled formation of structural disorder. Analysis of differential thermogravimetry (DTG) curve profile showed three temperature regions, around 345 degrees C, 570 degrees C and above 700 degrees C, related to amorphous phase with a carbon-oxygen functional groups, small defective nanostructures and highly crystalline structure of graphene nanosheets, respectively. Raman spectroscopy and x-ray photoelectron spectroscopy (XPS) analysis of the nanosheets showed an increase of D/G Raman band ratio as well as increasing of sp(3) phase content, from 6.1 at% to 15.2 at%, for highly crystalline and highly disordered structure of the nanosheets. Thermal annealing under synthetic air was used to investigate the variation in D/G and 2D/G Raman band ratio of the samples and to estimate activation energy of oxidation and disintegration process of graphene nanosheets. The highest oxidation resistance exhibited sample with high 2D/G band ratio (1.54) and lowest oxygen content of 1.7 at%. The synthesis process led to stabilization of nanosheet structure by formation of curved edges and elimination of free dangling bonds. The nanosheets prepared in microwave plasma exhibited high surface area, over 350 m(2) g(-1), and superior thermal stability with defect activation energy in an oxidation atmosphere higher than 2 eV. Heat release rate during the oxidation process was in correlation with the amount of disorder in the samples. Fast and easy to use technique based on high power Raman spectroscopy was developed for assessment of nanomaterial oxidation resistance.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10305 - Fluids and plasma physics (including surface physics)
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of physics D: Applied physics
ISSN
0022-3727
e-ISSN
1361-6463
Volume of the periodical
54
Issue of the periodical within the volume
16
Country of publishing house
GB - UNITED KINGDOM
Number of pages
19
Pages from-to
„165201-1“-„165201-19“
UT code for WoS article
000614413600001
EID of the result in the Scopus database
2-s2.0-85101767769