tailieunhanh - Báo cáo hóa học: " Ion beam-induced shaping of Ni nanoparticles embedded in a silica matrix: from spherical to prolate shape"

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: Ion beam-induced shaping of Ni nanoparticles embedded in a silica matrix: from spherical to prolate shape | Kumar et al. Nanoscale Research Letters 2011 6 155 http content 6 1 155 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Ion beam-induced shaping of Ni nanoparticles embedded in a silica matrix from spherical to prolate shape 1 1 2 2 3 Hardeep Kumar Santanu Ghosh Devesh Kumar Avasthi Debdulal Kabiraj Arndt Mucklich Shengqiang Zhou3 Heidemarie Schmidt3 Jean-Paul Stoquert4 Abstract Present work reports the elongation of spherical Ni nanoparticles NPs parallel to each other due to bombardment with 120 MeV Au 9 ions at a fluence of 5 X 1013 ions cm2. The Ni NPs embedded in silica matrix have been prepared by atom beam sputtering technique and subsequent annealing. The elongation of Ni NPs due to interaction with Au 9 ions as investigated by cross-sectional transmission electron microscopy TEM shows a strong dependence on initial Ni particle size and is explained on the basis of thermal spike model. Irradiation induces a change from single crystalline nature of spherical particles to polycrystalline nature of elongated particles. Magnetization measurements indicate that changes in coercivity Hc and remanence ratio Mr Ms are stronger in the ion beam direction due to the preferential easy axis of elongated particles in the beam direction. Introduction Metal nanoparticles NPs embedded in transparent matrices are the subject of large scientific and technological interest as they show significantly different properties as compared to their bulk counterpart 1 2 . The NP size and shape orientation interparticle separation and dielectric constant of the surrounding matrix are the crucial parameters which control their properties. Generally the NP shape and orientation is difficult to control by synthesis p arameters. One of the interesting aspects of shape anisotropy in noble metal NPs is the splitting of the surface plasmon resonance band 3-6 which can be tuned from visible to infrared region. Prolate-shaped NPs nanorods .

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