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Synthesis of magnetic nanofibers using femtosecond laser material processing in air.

Alubaidy MA, Venkatakrishnan K, Tan B - Nanoscale Res Lett (2011)

Bottom Line: The nanofibers diameter varies between 30 and 70 nm and they are mixed with nanoparticles.X-ray diffraction (XRD) analysis revealed metallic and oxide phases in the nanostructure.The growth of magnetic nanostructure is highly recommended for the applications of magnetic devices like biosensors and the results suggest that the pulsed-laser method is a promising technique for growing nanocrystalline magnetic nanofibers and nanoparticles for biomedical applications.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Mechanical Engineering, Ryerson University, 350 Victoria Street, Toronto, ON, M3N 2H8, Canada. venkat@ryerson.ca.

ABSTRACT
In this study, we report formation of weblike fibrous nanostructure and nanoparticles of magnetic neodymium-iron-boron (NdFeB) via femtosecond laser radiation at MHz pulse repetition frequency in air at atmospheric pressure. Scanning electron microscopy (SEM) analysis revealed that the nanostructure is formed due to aggregation of polycrystalline nanoparticles of the respective constituent materials. The nanofibers diameter varies between 30 and 70 nm and they are mixed with nanoparticles. The effect of pulse to pulse separation rate on the size of the magnetic fibrous structure and the magnetic strength was reported. X-ray diffraction (XRD) analysis revealed metallic and oxide phases in the nanostructure. The growth of magnetic nanostructure is highly recommended for the applications of magnetic devices like biosensors and the results suggest that the pulsed-laser method is a promising technique for growing nanocrystalline magnetic nanofibers and nanoparticles for biomedical applications.

No MeSH data available.


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TEM images of magnetic nanofibers generated by femtosecond laser at 26 MHz pulse repetition rate and 15 W power.
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Figure 3: TEM images of magnetic nanofibers generated by femtosecond laser at 26 MHz pulse repetition rate and 15 W power.

Mentions: The laser pulse repetition rate plays a critical role in the formation of nanofibrous like structure. Figure 2 shows SEM images of the magnetic weblike nanofibers generated at 4, 8, 13, and 26 MHz pulse repetition rate. The average diameters of the generated nanofibers were around 70, 60, 45, and 30 nm, respectively. Figure 3a shows the TEM image of magnetic nanofibers at 26 MHz pulse repetition rate and Figure 3b shows a single magnetic nanofiber generated by femtosecond laser. It depicts that magnetic nanofibers possess weblike structures with diameter not more than 30 nm. Further EDX analysis of the irradiated surface shows existence of oxygen as shown in Figure 4 which indicates, besides the percentage of oxygen to neodymium-iron-boron, the existence of oxidized magnetic nanofibers [23].


Synthesis of magnetic nanofibers using femtosecond laser material processing in air.

Alubaidy MA, Venkatakrishnan K, Tan B - Nanoscale Res Lett (2011)

TEM images of magnetic nanofibers generated by femtosecond laser at 26 MHz pulse repetition rate and 15 W power.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211468&req=5

Figure 3: TEM images of magnetic nanofibers generated by femtosecond laser at 26 MHz pulse repetition rate and 15 W power.
Mentions: The laser pulse repetition rate plays a critical role in the formation of nanofibrous like structure. Figure 2 shows SEM images of the magnetic weblike nanofibers generated at 4, 8, 13, and 26 MHz pulse repetition rate. The average diameters of the generated nanofibers were around 70, 60, 45, and 30 nm, respectively. Figure 3a shows the TEM image of magnetic nanofibers at 26 MHz pulse repetition rate and Figure 3b shows a single magnetic nanofiber generated by femtosecond laser. It depicts that magnetic nanofibers possess weblike structures with diameter not more than 30 nm. Further EDX analysis of the irradiated surface shows existence of oxygen as shown in Figure 4 which indicates, besides the percentage of oxygen to neodymium-iron-boron, the existence of oxidized magnetic nanofibers [23].

Bottom Line: The nanofibers diameter varies between 30 and 70 nm and they are mixed with nanoparticles.X-ray diffraction (XRD) analysis revealed metallic and oxide phases in the nanostructure.The growth of magnetic nanostructure is highly recommended for the applications of magnetic devices like biosensors and the results suggest that the pulsed-laser method is a promising technique for growing nanocrystalline magnetic nanofibers and nanoparticles for biomedical applications.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Mechanical Engineering, Ryerson University, 350 Victoria Street, Toronto, ON, M3N 2H8, Canada. venkat@ryerson.ca.

ABSTRACT
In this study, we report formation of weblike fibrous nanostructure and nanoparticles of magnetic neodymium-iron-boron (NdFeB) via femtosecond laser radiation at MHz pulse repetition frequency in air at atmospheric pressure. Scanning electron microscopy (SEM) analysis revealed that the nanostructure is formed due to aggregation of polycrystalline nanoparticles of the respective constituent materials. The nanofibers diameter varies between 30 and 70 nm and they are mixed with nanoparticles. The effect of pulse to pulse separation rate on the size of the magnetic fibrous structure and the magnetic strength was reported. X-ray diffraction (XRD) analysis revealed metallic and oxide phases in the nanostructure. The growth of magnetic nanostructure is highly recommended for the applications of magnetic devices like biosensors and the results suggest that the pulsed-laser method is a promising technique for growing nanocrystalline magnetic nanofibers and nanoparticles for biomedical applications.

No MeSH data available.


Related in: MedlinePlus