Facile synthesis of highly uniform Mn/Co-codoped ZnO nanowires: Optical, electrical, and magnetic properties

Abstract

In this article, Co/Mn-codoped ZnO nanowires (NWs) were successfully synthesized on a silicon substrate by the thermal evaporation method with Au catalyst. The X-ray diffraction pattern indicated that the Co/Mn-codoped ZnO NWs are a hexagonal wurtzite structure without a second phase, and energy dispersive X-ray spectroscopy revealed that the Co and Mn ions were introduced into the ZnO NWs with the content of ∼0.8 at% and ∼1.2 at%, respectively. Photoluminescence spectra and Raman spectra showed that the Co/Mn were doped into the NWs and resulted in the shift of the near-band-edge emission. Moreover, the novel Raman peak at 519.3 cm(-1) has suggested that the two kinds of cations via doping could affect the local polarizability. Compared with the undoped ZnO NW, the electrical measurement showed that the Co/Mn-codoping enhanced the conductivity by an order of magnitude due to the presence of Co, Mn cations. The electron mobility and carrier concentration of a fabricated field effect transistor (FET) device is 679 cm2 V(-1) s(-1) and 2×10(18) cm(-3), respectively. Furthermore, the M-H curve demonstrated that the Co/Mn-codoped ZnO NWs have obvious ferromagnetic characteristics at room temperature. Our study enhances the understanding of the novel performances of transition-metal codoped ZnO NWs and also provides a potential way to fabricate optoelectronic devices.

Significant room-temperature ferromagnetism in porous ZnO films: The role of oxygen vacancies

“…The special porous structure, with a large specific surface area, results in the presence of numerous oxygen vacancies and conduction electrons in the ZnO films [33]. The oxygen vacancies are in a state of charge imbalance, so it is energetically favorable for oxygen vacancies to trap electrons.…”

The investigation of mechanical and dielectric properties of Samarium doped ZnO nanoparticles

“…The dielectric constants and dielectric loss are also influenced by the Samarium doping. It is noticed that these parameters decline with the increase in the concentration of Sm for the same frequency that may be explained by the effect of Sm 3+ on the polarizability of ZnO [57].…”

Effect of ionic size compensation by Ag+ incorporation in homogeneous Fe-substituted ZnO: studies on structural, mechanical, optical, and magnetic properties

“…23 Magnetic properties of multiple ions doped (or) co-doped ZnO nanomaterials are also studied. 24,25 However, the real origin of ferromagnetism is still controversial as magnetism appears in pure ZnO, TM doped ZnO and non-TM doped ZnO.…”