Fabrication of Luminescent, Magnetic Hollow Core Nanospheres and Nanotubes of Cr-Doped ZnO by Inclusive Coprecipitation Method

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• 作者：K. Jayanthi ; Santa Chawla ; Amish G. Joshi ; Zahid H. Khan ; R. K. Kotnala
• 刊名：Journal of Physical Chemistry C
• 出版年：2010
• 出版时间：November 4, 2010
• 年：2010
• 卷：114
• 期：43
• 页码：18429-18434
• 全文大小：295K
• 年卷期：v.114,no.43(November 4, 2010)
• ISSN：1932-7455

文摘

Incorporation of Cr into ZnO lattice as a dopant in hollow core nanostructures has been achieved by coprecipitation in highly alkaline medium near room temperature. Energy dispersive spectroscopy and X-ray diffraction studies confirm the presence of Cr in the ZnO lattice and X-ray photoelectron spectroscopy (XPS) identified the dopant state to be Cr³⁺. Room temperature ferromagnetism in ZnO:Cr³⁺ along with structural investigations suggest an intrinsic nature of ferromagnetism in hollow core nanospheres. Unpaired spin in Cr³⁺ in zinc substitutional sites could create spin ordering and long-range ferromagnetic coupling. Higher Cr³⁺ concentration leads to the formation of hollow parallelepipeds and superparamagnetism. Photoluminescence studies reveal a sharp blue emission explicitly arising due to Cr doping. Such blue emitting magnetic nanocapsules can have immense potential as biocarriers and also in spintronics.