Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Synthesis of magnetic nanofibers using femtosecond laser material processing in air | Alubaidy et al. Nanoscale Research Letters 2011 6 375 http content 6 1 375 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Synthesis of magnetic nanofibers using femtosecond laser material processing in air Mohammed-Amin Alubaidy1 Krishnan Venkatakrishnan1 and Bo Tan2 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. Introduction Nanomaterials field is of current interest because it studies materials with morphological features on the nanoscale. Nanosized materials show distinctive properties compared with bulk materials 1-3 . In particular magnetic nanostructures have recently attracted much attention because of their intriguing properties that are not displayed by their bulk or particle counterparts. These nanostructures are potentially useful as active components for ultrahigh-density data storage as well as in the fabrication of sensors and spintronic devices 4 . The growth of nanofibers using ultrafast laser offers advantages of high resolution high throughput .
