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The Effect of Temperature and Agitation on Polyethyleneimine Adsorption on Iron Oxide Magnetic Nanoparticles in the Synthesis of Iron Oxide-Au Core–Shell Nanoparticles

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Iron oxide nanoparticles play important role in fields such magnetic fluids, data storage, catalysis and biomedical applications. This is attributed to their unique properties and their ability to be controlled with an external magnet and directed towards specific targets for analysis. This paper looks into the effect of different heating temperatures on polyethyleneimine (PEI) adsorption in the formation of PEI/iron oxide (Fe2O3-PEI) nanoparticles and the effect of temperature on the capping capabilities of PEI in the formation iron oxide core/gold shell nanoparticles. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were used in the analysis of the effect of PEI adsorption on the Fe2O3-PEI nanoparticles by measuring change in charge transfer resistance of the particles. The result showed that 40 °C is most favourable for PEI adsorption on iron oxide nanoparticles average particles size 50 nm and also favours capping in the formation of iron oxide core/gold shell nanoparticles. The electrochemical impedance spectroscopy analysis also showed that 40 °C had the least charge transfer (R ct) resistance of 38 followed by 25 °C (76 Ω) and highest at 100 °C (R ct = 207 Ω) due to PEI lost its polycationic nature with increasing temperature. The UV-VIS spectra for Fe2O3-Au shell nanoparticles formed showed further blue shift of the surface plasmon resonance to 548 nm at 40 °C indicating increased gold shell formation on the nanoparticles. Effect of agitation in synthesis of Fe2O3/PEI nanoparticles was studied at room temperature (25 °C) with stirring and non-stirring. It showed that stirring increased PEI adsorption on iron oxide nanoparticles.
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Document Type: Research Article

Publication date: May 1, 2014

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  • Advanced Science, Engineering and Medicine (ASEM) is a science, engineering, technical and medical journal focused on the publishing of peer-reviewed multi-disciplinary research articles dealing with all fundamental and applied research aspects in the areas of (1) Physical Sciences, (2) Engineering, (3) Biological Sciences/Health Sciences, (4) Medicine, (5) Computer and Information Sciences, (6) Mathematical Sciences, (7) Agriculture Science and Engineering, (8) Geosciences, and (9) Energy/Fuels/Environmental/Green Science and Engineering.
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