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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.

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XRD patterns for NdFeB magnetic nanofibers generated at 4, 8, 13, and 26 MHz.
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Figure 7: XRD patterns for NdFeB magnetic nanofibers generated at 4, 8, 13, and 26 MHz.

Mentions: Characterization was performed using XRD as a function of femtosecond laser pulse repetition rate. Figure 6 shows XRD pattern of NdFeB magnetic nanofibers generated by femtosecond laser at 26 MHz and a power of 15 W. The average nanofibers size is about 28.5 nm estimated from the XRD peaks using the Scherrer formula [25]. This value is consistent with nanofiber size obtained by TEM analysis as shown in Figure 3. In comparison, the size of nanofibers prepared using the conventional methods is around 40 nm which is slightly bigger than our method and do not have the weblike structure [27]. Figure 7 shows the XRD patterns for magnetic nanofibers generated at 4, 8, 13, and 26 MHz, respectively. For the non-irradiated area in Figure 7, no diffraction peaks indexed by the Nd2Fe14B phase were observed. However, the peaks from Nd2Fe14B phase can be observed clearly in the samples irradiated with femtosecond laser. For the area irradiated with laser at 26 MHz, the peak from α-Fe was mainly found. Therefore, it is considered that the α-Fe peak is attributed to the surface oxidation and it is existed on the surface of the sample.


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

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

XRD patterns for NdFeB magnetic nanofibers generated at 4, 8, 13, and 26 MHz.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 7: XRD patterns for NdFeB magnetic nanofibers generated at 4, 8, 13, and 26 MHz.
Mentions: Characterization was performed using XRD as a function of femtosecond laser pulse repetition rate. Figure 6 shows XRD pattern of NdFeB magnetic nanofibers generated by femtosecond laser at 26 MHz and a power of 15 W. The average nanofibers size is about 28.5 nm estimated from the XRD peaks using the Scherrer formula [25]. This value is consistent with nanofiber size obtained by TEM analysis as shown in Figure 3. In comparison, the size of nanofibers prepared using the conventional methods is around 40 nm which is slightly bigger than our method and do not have the weblike structure [27]. Figure 7 shows the XRD patterns for magnetic nanofibers generated at 4, 8, 13, and 26 MHz, respectively. For the non-irradiated area in Figure 7, no diffraction peaks indexed by the Nd2Fe14B phase were observed. However, the peaks from Nd2Fe14B phase can be observed clearly in the samples irradiated with femtosecond laser. For the area irradiated with laser at 26 MHz, the peak from α-Fe was mainly found. Therefore, it is considered that the α-Fe peak is attributed to the surface oxidation and it is existed on the surface of the sample.

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