Composite Fe3O4@Au Core-Shell Nanoparticle: Tunable and Enhancement of Optical Absorption Property

Abstract

Bifunctional nanomaterial Fe 3 O 4 @Au core-shell is a kind of nanoparticle that includes magnetic iron oxide core with gold coated. It can be used in can achieve the controllable and tunable electromagnetic field enhancement and may open up exciting opportunities to engineer new materials used in biomedical applications. This research work aims at theoretical investigating the basic optical absorption property of Fe 3 O 4 @Au core-shell with varying number particles, inter-particle distance, and direction of incident light using the discrete dipole approximation method (DDA) in the wavelength of visible to near-infrared ranges of the electromagnetic wave spectrum. The results were observed that these parameters can be enhanced optical light absorption and tuned the LSPR peak position. The obtained results might be used for basic fabricating the more performance specific applications like a drug in life science.

Catalytic ferromagnetic gold nanoparticle immunoassay for the detection and differentiation of Mycobacterium tuberculosis and Mycobacterium bovis

“…The shift in peak wavelength (from 517 to 550 nm) corresponded to an increase in NP diameter. This has previously been observed during Au-Fe3O4 NP synthesis, wherein successful assembly of Au with the Fe3O4 NPs led to a similar shift in peak wavelength [45]. The magnetic capabilities of Fe3O4 NPs and Au-Fe3O4 NPs were demonstrated by collection using a 3000 G permanent magnet, resulting in a phase separation in both the Fe3O4 NP and Au-Fe3O4 NP solutions after the ferromagnetic NPs had migrated towards the permanent magnet (Figure 1b).…”

Theoretical calculation of the optical absorption property of nanoparticles composed of an Au Core and Si shell embedded in silica

“…where, V is the volume of the particle, x is a size parameter, = L 1 3 for a spherical shape, l is the wavelength of incident light, e i and e m are the dielectric functions of pure nanoparticles and the host matrix, respectively. The empirical constants A and B are defined as: For core-shell nanoparticles, e e = i c s in equation (2) can be written as [7,21]: correspond to the core and shell radii of a core@shell particle as denoted in figure 1(a), where core and shell refer to their respective and specific materials. In the DDA method, the target particle was assumed to be a point dipole.…”

“…Combining multiple materials in single nanoparticles has gained much attention in recent years due to the additional functionalities exhibited. Using materials with different properties can result in new materials with characteristics not exhibited in particles of individual materials [1][2][3][4][5][6][7][8][9]. Spherical nanoparticles (NPs) fabricated from noble metals, such as silver (Ag), gold (Au), and semiconductor materials are a few examples of such composite NPs.…”

The Effect of Surface Plasmon Resonances on Spherical Magneto-Plasmonic Fe3O4@Ag Core-Shell Nanoparticles

“…A great attention has been given to the development of nanomaterials as they exhibit unique material properties as compared to their bulk counterpart. These unique properties includes optical, magnetic, specific heat, melting point, surface activities, chemical and biological properties [1].…”