Abstract
In this paper we have reported the synthesis of high quality vertically aligned undoped and Mn-doped ZnO single crystalline nanorods arrays on Si (100) substrates using two steps process, namely, initial slow seed layer formation followed by solution growth employing wet chemical hydrothermal method. The shapes of the as grown single crystalline nanorods are hexagonal. The diameter and length of the as grown undoped ZnO nanorods varies in the range of 80-150 nm and 1.0 - 1.4 μm, respectively. Along with the lattice parameters of the hexagonal crystal structure, the diameter and length of Mn doped ZnO nanorods are found to increase slightly as compared to the undoped ZnO nanorods. The X-ray photoelectron spectroscopy confirms the presence of Mn atoms in Mn2+ state in the single crystalline ZnO nanorods. The recorded photoluminescence spectrum contains two emissions peaks having UV exciton emissions along with a green-yellow emission. The green-yellow emissions provide the evidence of singly ionized oxygen vacancies. The magnetic field dependent magnetization measurements [M (H)] and zero field cooled (ZFC) and field cooled (FC) magnetization [M(T)] measurements have been carried out at different isothermal conditions in the temperature range of 5-300 K. The Mn doped ZnO nanorods clearly show room temperature ferromagnetic ordering near room temperature down to 5 K. The observed magnetization may be attributed to the long range ferromagnetic interaction between bound magnetic polarons led by singly charged oxygen vacancies.
Highlights
Nanostructred semiconductor materials, especially II–VI semiconductors, have attracted great interests due to their unique properties and potential applications.[1]
In this paper we have reported the synthesis of high quality vertically aligned undoped and Mn-doped Zinc oxide (ZnO) single crystalline nanorods arrays on Si (100) substrates using two steps process, namely, initial slow seed layer formation followed by solution growth employing wet chemical hydrothermal method
Due to the addition of Mn dopants there is a shift in the diffraction peak position at lower angle side compared to the undoped ZnO
Summary
Etc. which influences the magnetic properties in ZnO. The research on diluted magnetic semiconductors (DMS) reveal the application of ZnO as a good host material for spintronic devices,[13,14,15] which make use of electron spin for data reading and writing. Most of the processes contain low pressure, high temperature, controlled rate of flow of carrier gases etc. From this point of view the wet chemical method is simple and less expensive for synthesis of various kinds of nanostructures. It provides a better route for synthesizing 1-D as well as multi-dimensional nanostructures in a large scale. In this present work we have synthesized undoped and Mn doped single crystalline self assembled vertically aligned ZnO nanorods on p-Si substrate using hydrothermal method. The Mn doped ZnO nanorods show ferromagnetic ordering near room temperature down to 5 K
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