Synthesis and properties of modified graphite encapsulated iron metal nanoparticles
| Autor: | Ya-Hsuan Liou, Chih-Cheng Chiu, Ren-Wei Chang, Shang-Shih Li, Mao-Hua Teng |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Precipitation (chemistry) Graphene Mechanical Engineering Inorganic chemistry Nanoparticle 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Electronic Optical and Magnetic Materials law.invention Solvent chemistry.chemical_compound Colloid Thionyl chloride chemistry Nitric acid law Materials Chemistry Graphite Electrical and Electronic Engineering 0210 nano-technology |
| Zdroj: | Diamond and Related Materials. 63:153-158 |
| ISSN: | 0925-9635 |
| DOI: | 10.1016/j.diamond.2015.12.009 |
| Popis: | Graphite encapsulated iron metal nanoparticles (FeGEM) are a core/shell nanostructured material. By introducing various liquid alcohols as carbon source during modified arc-discharge synthesis procedures, we succeeded in raising the yield rate of FeGEM from 10 wt.% to 40–50 wt.%. However, the hydrophobic outer graphite (graphene) shells and the strong magnetic attraction between inner ferromagnetic iron cores can easily lead to rapid agglomeration and precipitation of FeGEM nanoparticles in a polar solvent such as water. As a result, it may impede many potential applications of FeGEM nanoparticles in numerous fields. To overcome the problem, it is necessary to change the hydrophobic surface of FeGEM nanoparticles to a hydrophilic one. In this work, we show that progressive sequential refluxing in nitric acid, thionyl chloride and tetraethylenepentamine (TEPA) can modify FeGEM nanoparticles with different functional groups. After refluxing with nitric acid solution, the grafted FeGEM is able to disperse in polar solvent, such as deionized water or ethanol for over 24 h. Zeta potential analysis and SQUID were used to characterize the grafted FeGEM at the refluxing step, and ultraviolet–visible spectrophotometry was used to measure the suspension ability of modified FeGEM nanoparticles in a colloidal system. |
| Databáze: | OpenAIRE |
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