Calcium incorporation in graphene oxide particles: A morphological, chemical, electrical, and thermal study
| Autor: | Rodrigo S. Neves, Raphael Verdan Curti, Carlos A. Achete, Sandra M. Landi, Alexei Kuznetsov, Joyce R. Araujo, Kelly Leite dos Santos Castro, Braulio S. Archanjo, Lídia Ágata de Sena, Erlon H. Martins Ferreira |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Inorganic chemistry Oxide chemistry.chemical_element 02 engineering and technology Calcium 010402 general chemistry 01 natural sciences law.invention chemistry.chemical_compound X-ray photoelectron spectroscopy law Materials Chemistry Thermal stability Graphene oxide paper Graphene Metals and Alloys Surfaces and Interfaces 021001 nanoscience & nanotechnology 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Calcium carbonate chemistry Surface modification 0210 nano-technology |
| Zdroj: | Thin Solid Films. 610:10-18 |
| ISSN: | 0040-6090 |
| DOI: | 10.1016/j.tsf.2016.04.042 |
| Popis: | Surface chemical modification and functionalization are common strategies used to provide new properties or functionalities to a material or to enhance existing ones. In this work, graphene oxide prepared using Hummers' method has been chemically modified with calcium ions by immersion in a calcium carbonate solution. Transmission electron microscopy analyses showed that graphene oxide (GO) and calcium incorporated graphene oxide have a morphology similar to an ultra-thin membrane composed of overlapping sheets. X-ray diffraction and Fourier-infrared spectroscopy show that calcium carbonate residue was completely removed by hydrochloric acid washes. Energy dispersive X-ray spectroscopy mapping showed spatially homogeneous calcium in Ca-incorporated graphene oxide sample after HCl washing. This Ca is mainly ionic according to X-ray photoelectron spectroscopy, and its incorporation promoted a small reduction in the graphene oxide structure, corroborated also by four-point probe measurements. A thermal study shows a remarkable increase in the GO stability with the presence of Ca 2 + ions. |
| Databáze: | OpenAIRE |
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