Synthesis of the RGO/Al2O3 core-shell nanocomposite flakes and characterization of their unique electrostatic properties using zeta potential measurements

Agnieszka Maria Jastrzębska , Joanna Karcz , Rafał Letmanowski , Dariusz Zabost , Ewelina Ciecierska , Joanna Zdunek , Ewa Karwowska , Maciej Siekierski , Andrzej Olszyna , Antoni Kunicki

Abstract

The aim of this study was to describe the influence of the modification of electrostatic properties of RGO/Al2O3 core–shell nanocomposite flakes. The amount of crystalline form of aluminum oxide was very small. It existed mostly in amorphous phase in the form of covalently bonded to GO surface. The morphological, structural and physicochemical investigations results showed that spherical Al2O3 nanoparticles (ca. 41 nm) in gamma phase completely covered the surface of curly-shaped RGO flakes and acted as a spreader between individual flakes. The high BET specific surface area of the analyzed composite (119.71 m2/g) together with very low open porosity (0.479 cm3/g) indicated that RGO/Al2O3 nanocomposite flakes showed low tendency to agglomeration. The zeta potential curves obtained for RGO/Al2O3 core–shell nanocomposite flakes were differing from curves obtained for GO and Al2O3 suspensions in distilled water and neutral environment. The specific electrostatic properties of the core–shell system of RGO/Al2O3 flakes had an influence on its surface charge (zeta potential) which was measured by applying an external electric field. The FTIR and Raman investigations results also confirmed that the Cdouble bond; length as m-dashO species were not taking part in the surface amphoteric reactions resulting in the formation of electrostatic surface charge.
Author Agnieszka Maria Jastrzębska ZMCP
Agnieszka Maria Jastrzębska,,
- Division of Ceramic Materials and Polymers
, Joanna Karcz ZMCP
Joanna Karcz,,
- Division of Ceramic Materials and Polymers
, Rafał Letmanowski KChNTCS
Rafał Letmanowski,,
- Chair Of Inorganic Chemistry And Solid State Technology
, Dariusz Zabost KChNTCS
Dariusz Zabost,,
- Chair Of Inorganic Chemistry And Solid State Technology
, Ewelina Ciecierska ZPM
Ewelina Ciecierska,,
- Division of Materials Design
, Joanna Zdunek ZPM
Joanna Zdunek,,
- Division of Materials Design
, Ewa Karwowska ZB
Ewa Karwowska,,
- Department of Biology
, Maciej Siekierski KChNTCS
Maciej Siekierski,,
- Chair Of Inorganic Chemistry And Solid State Technology
, Andrzej Olszyna ZMCP
Andrzej Olszyna,,
- Division of Ceramic Materials and Polymers
, Antoni Kunicki ZKChM
Antoni Kunicki,,
- Department Of Catalysis And Organometallic Chemistry
Journal seriesApplied Surface Science, ISSN 0169-4332
Issue year2016
Vol362
Pages577-594
Publication size in sheets0.85
Keywords in EnglishRGO/Al2O3 core-shell; Reduced graphene oxide; Zeta potential
DOIDOI:10.1016/j.apsusc.2015.10.125
URL http://www.sciencedirect.com/science/article/pii/S0169433215025441
Languageen angielski
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1-s2.0-S0169433215025441-main.pdf (file archived - login or check accessibility on faculty) 1-s2.0-S0169433215025441-main.pdf 5.06 MB
Score (nominal)35
ScoreMinisterial score = 35.0, 28-11-2017, ArticleFromJournal
Ministerial score (2013-2016) = 35.0, 28-11-2017, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 3.387 (2) - 2016=3.184 (5)
Citation count*11 (2018-02-22)
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
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