Morphology, Optical, and Magnetic Properties of Zn_1−xCo_xO Nanorods Grown via a Wet Chemical Route

Abstract

Co‐doped ZnO nanorods (Zn1−xCoxO) with x=0.05, 0.1, and 0.2 were successfully grown on indium‐doped tin oxide glass substrates via a wet chemical route at 70°C for 10 h. The effect of Co‐doping level on the morphology, crystalline phases, optical, and magnetic properties of the ZnO nanorods was studied. Based on scanning electron microscopy, TEM, and XRD studies, it is confirmed that Co‐doped ZnO nanorods were grown along the [0001] direction. Co doping affects the d‐spacing and with an increasing Co concentration, the lattice parameter c is increased slightly. The incorporation of Co in ZnO is confirmed with XPS, whereby it is shown that the excitation state of Co is (+2), which rules out the formation of a secondary phase such as Co2O3 or Co3O4, which is consistent with XRD phase analysis results. The near‐band edge emission peak of ZnO nanorods is red shifted in response to Co doping, and the band gap energy of (Zn1−xCoxO) nanorods decreases with the increasing Co doping. Zn0.95Co0.05O and Zn0.9Co0.1O nanorods exhibit a degree of paragmagnetism, while the nanorods with higher Co concentration (Zn0.8Co0.2O) exhibit ferromagnetic behavior at room temperature.

Effect of (Li, Mn) co-doping on structural, optical and magnetic properties of chunk-shaped nano ZnO

“…18d). Mn doped and co-doped ZnO CSNS magnetization are comparable to those obtained for Mn and Co doped ZnO samples [19,77]. The magnetic moment of the of the ZnO: (Mn,Li) film is 0.18 µB/Mn and Zn 0.87 Mn 0.08 Li 0.05 O is 0.8 µB/Mn [37], which is higher than that of this work.…”

Study of structural, optical and magnetic properties of cobalt doped ZnO nanorods

“…61 Both intrinsic parameters like oxygen vacancy, Zn interstitial and extrinsic parameters like magnetic clusters or separate phase formation have been observed to be responsible for different kind of magnetic behaviour. [62][63][64][65] Several studies have reported on the grain boundary defect mediated ferromagnetism in Co-doped lms. [66][67][68][69] Recently, Aravindh et al predicted room temperature ferromagnetism arising due to exchange coupling of a pair of Co atoms at the grain boundary, a new observation based on rst-principle calculations.…”

“…Although there are several reports on the synthesis of nanoparticles (NPs) by wet chemical route, there are very few reports on the formation of nanorods (NRs) without using any substrate/seed layer by this method. 55,60,65,77 The present study investigates the structural, optical and magnetic behavior of pure and Codoped ZnO NPs as well as NRs synthesized by a simple, lowcost chemical method.…”

The Effect of Cation Distribution on Magnetic and Infrared Emission Properties of RE3+, MnO2:CoZn (RE = La,Ce,Pr,Nd,Sm,Eu,Gd,Tb, and Dy) Ferrite Ceramics

“…Cobalt zinc (CoZn) ferrite ceramic has been the subject of numerous studies in the past years for its magnetic properties . The material is already used as permanent magnets or as granular magnetic recording media.…”

“…C OBALT zinc (CoZn) ferrite ceramic has been the subject of numerous studies in the past years for its magnetic properties. 1,2 The material is already used as permanent magnets or as granular magnetic recording media. Doping has also been performed on the CoZn ferrite to improve the saturation magnetization and coercivity.…”