Abstract
In this work, the magnetic properties of silicon nanotubes (SiNTs) filled with Fe3O4 nanoparticles (NPs) are investigated. SiNTs with different wall thicknesses of 10 and 70 nm and an inner diameter of approximately 50 nm are prepared and filled with superparamagnetic iron oxide nanoparticles of 4 and 10 nm in diameter. The infiltration process of the NPs into the tubes and dependence on the wall-thickness is described. Furthermore, data from magnetization measurements of the nanocomposite systems are analyzed in terms of iron oxide nanoparticle size dependence. Such biocompatible nanocomposites have potential merit in the field of magnetically guided drug delivery vehicles.PACS61.46.Fg; 62.23.Pq; 75.75.-c; 75.20.-g
Highlights
Porous materials with their substantial surface areas are versatile structures with specific properties of value for diverse fields such as photonics, catalysis, and therapeutics [1]
Silicon nanotubes were fabricated by a multistep process previously described [3] involving deposition of silane (SiH4) on preformed zinc oxide (ZnO) nanowire array templates on F-doped tin oxide (FTO) glass or Si wafer segments, followed by sacrificial etching of the ZnO phase resulting in the desired nanotube product
In the experiments described here, we focus on the infiltration of Fe3O4 nanoparticles into silicon nanotubes (SiNTs) with two rather different shell thicknesses, a thin porous variant with a 10-nm shell (Figure 1A) or a very thick 70-nm
Summary
Porous materials with their substantial surface areas are versatile structures with specific properties of value for diverse fields such as photonics, catalysis, and therapeutics [1]. Porous silicon is a unique example of this type of material whose biocompatibility and biodegradability lend it great potential value to biomedical applications [2]. SiNTs are tunable in their inner diameter as well as in their wallthicknesses [3]. They provide a uniform structure compared to the dendritic pore growth of porous silicon in the target porous regime (30 to 90 nm pore diameter), and such structures are attractive for infiltration with nanoparticles or molecules (e.g., superparamagnetic (SPM) iron oxide nanoparticles of the form Fe3O4). In terms of possible candidates for loading, superparamagnetic Fe3O4 nanoparticles (NPs) offer a low toxicity and can be applied to diverse uses in biomedicine, e.g., for hyperthermia, NMR imaging, and functionalization with anti-cancer agents [4]
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