Abstract
A novel approach for the in situ synthesis of zerovalent aryl-coated iron nanoparticles (NPs) based on diazonium salt chemistry is proposed. Surface-modified zerovalent iron NPs (ZVI NPs) were prepared by simple chemical reduction of iron(III) chloride aqueous solution followed by in situ modification using water soluble arenediazonium tosylate. The resulting NPs, with average iron core diameter of 21 nm, were coated with a 10 nm thick organic layer to provide long-term protection in air for the highly reactive zerovalent iron core up to 180 °C. The surface-modified iron NPs possess a high grafting density of the aryl group on the NPs surface of 1.23 mmol/g. FTIR spectroscopy, XRD, HRTEM, TGA/DTA, and elemental analysis were performed in order to characterize the resulting material.
Highlights
Functionalized magnetic nanoparticles (NPs) have aroused great interest recently due to their unique properties and the possibility of widespread applications [1,2]
We found that addition of aqueous 4-nitrobenzenediazonium tosylate (ADT) to the freshly prepared aqueous suspension of zerovalent iron NPs (ZVI NPs) leads to the formation of stable functionalized zerovalent iron (ZVI) NPs
The modified ZVI NPs showed a weight loss of 14% associated with the decomposition of the aryl layers and evolution of carbon dioxide registered by a mass spectroscopy (MS) detector
Summary
Functionalized magnetic nanoparticles (NPs) have aroused great interest recently due to their unique properties and the possibility of widespread applications [1,2]. Aromatic diazonium salts (ADSs) are excellent agents for the covalent grafting of organic functional groups onto carbon, metal and metal oxides surfaces [12,13].
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