Magnetic, Optical Properties of Magnetite Nanoparticle Synthesized in Different Parameters

Abstract

There are many methods for synthesizing magnetite nanoparticles. Most methods take a long time, and the result is undesirable. In this paper a green method was used to synthesize nanoparticles because it takes a short time and is both straightforward and eco-friendly. It is done by adding : =1:2 molar ratio solution with different amounts of extract and different amounts of NaOH solution for 20 min at different temperatures, in hotplate stirrers, to control their relative size. UV-Vis spectroscopy, vibrating sample magnetometer technique (VSM), transmission electron microscopy (TEM), and X-ray diffraction (XRD) were used to characterize the magnetite nanoparticles. The result confirms that the changes in amounts of NaOH and extract led to a change in the pH of a solution and that the increase in amounts of the extract caused the low addition of NaOH. These changes influenced the process of synthesis and characterization. The Uv-vis analysis confirms that the surface plasmon resonance had a highly visible brad peak in the 290–460 nm range, as well as a peak shift to shorter wavelengths (blue shift) with a pH change and a peak shift to longer wavelengths (red shift) with a temperature change. TEM imaging confirms that all the synthesized had a spherical shape with size changed according to a parameter change of within 40–9 nm. Magnetic analysis showed the magnetite nanoparticles synthesized have smaller sizes and are superparamagnetic with the influence of particle size on the magnetic properties, including Hc, Ms, and Mr.

Using Silica Shell to Improve the Surface of Magnetite Prepared by Biosynthesis Method

“…Magnetite nanoparticles have excellent potential for several applications, such as magnetic resonance imaging (MRI) [4], photo magnetics [5], medical diagnostics [6], cancer therapy [7], radiofrequency hyperthermia [8], waste water treatment [9], and biosensors [10]. Many synthesis methods have been reported, including thermal decomposition, coprecipitation, hydrothermal synthesis, and green synthesis [11,12]. Different synthesis methods can change the characteristics of Fe3O4 NPs, such as size and shape [13].…”