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
AbstractThe 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.
|Journal series||Applied Surface Science, ISSN 0169-4332|
|Publication size in sheets||0.85|
|Keywords in English||RGO/Al2O3 core-shell; Reduced graphene oxide; Zeta potential|
|Score|| = 35.0, 28-11-2017, ArticleFromJournal|
= 35.0, 28-11-2017, ArticleFromJournal
|Publication indicators||: 2016 = 3.387 (2) - 2016=3.184 (5)|
|Citation count*||11 (2018-02-22)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.