Nonquenching of Charge Carriers by Fe3O4 Core in Fe3O4/ZnO Nanosheet Photocatalyst

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• 作者：Chockalingam Karunakaran ; Pazhamalai Vinayagamoorthy ; Jayaraman Jayabharathi
• 刊名：Langmuir
• 出版年：2014
• 出版时间：December 16, 2014
• 年：2014
• 卷：30
• 期：49
• 页码：15031-15039
• 全文大小：529K
• ISSN：1520-5827

文摘

Fe₃O₄-implanted ZnO and pristine ZnO nanosheets have been synthesized hydrothermally. High-resolution scanning electron microscopy, high-resolution transmission electron microscopy, energy dispersive X-ray spectroscopy, elemental mapping, selected area electron diffractometry, powder X-ray diffractometry, Raman spectroscopy, vibrating sample magnetometry, solid state impedance spectroscopy, UV鈥搗isible diffuse reflectance spectroscopy, and photoluminescence spectroscopy show implantation of Fe₃O₄ in ZnO nanosheets. Fe₃O₄ core with ZnO shell is of type I core/shell heterostructure which is to quench charge carriers and suppress photocatalysis. But the photocatalytic activity is not suppressed on implantation of Fe₃O₄ in ZnO nanosheets, and time controlled single photon counting lifetime spectroscopy shows that the photogenerated charge carriers are not quenched by the Fe₃O₄ core in the ZnO nanosheets. The composite nanosheets are photostable, reusable, and magnetically recoverable, revealing potential application in mineralization of organic pollutants.