Spectroscopic Probing Of Mn-Doped ZnO Nanowires Synthesized via a Microwave-Assisted Route

Abstract

Dilute magnetic semiconductors such as transitionmetal-doped ZnO are potential candidates for spintronic applications. Transition metals such as Mn, Fe, and Cu when doped in ZnO enable spin magnetic properties to conventional semiconductors. Although several techniques such as wet chemical and vapor deposition methods are employed to achieve homogeneous doping in ZnO, these methods have limits pertaining to solubility levels of dopant ion, morphology, competition between intrinsic and extrinsic defects and localization of the defect species. This manuscript is an addition to the vast knowledge of methods and protocols that present the synthesis of transition-metal-doped ZnO. In this report, manganese-doped ZnO is synthesized via a microwave-assisted hydrolysis technique. The defect structure of Mn-doped ZnO wires is investigated via electron paramagnetic resonance and photoluminescence techniques. The analysis indicates that Mn 2+ substitutes the Zn ion and dominates the intrinsic defect species in ZnO.

Experimental and modeling study of ZnO:Ni nanoparticles for near-infrared light emitting diodes

“…Several recent works have contributed to the search for intrinsic point defects in ZnO nanocrystals. 42–48 Shankari Nadupalli et al uses electron paramagnetic resonance (EPR) and photoluminescence (PL) spectroscopy to analyze the intrinsic defect structure of ZnO. They compare the findings to previous computational work.…”

“…From Fig. 10a 42 Defects commonly mentioned in ZnO-based nanostructures are: [42][43][44][45][46][47][48] -Oxygen vacancies with different charged states (the +2 charged state (V O 2+ ), the +1 charged state (V O + ) and the neutral state (V O 0 )); the resulting emissions related to this type of defect usually occur near blue-green (approximately 420-550 nm).…”

Atomistic modeling of electromechanical properties of piezoelectric zinc oxide nanowires

“…The electromechanical properties of ZnO NWs are significantly influenced by defects [4,6], NW diameter [7], cross-sectional geometry [8][9][10], polarization orientation [11] and growth direction [11,12]. This dependence was attributed to the surface effect and structural anisotropy at the nanoscale level [13] and to the associated reconfiguration of surface atoms that led to a stiffer crystal, resulting in a stronger NW than its bulk form [14,15].…”

Single and Co-Doping of ZnO Nanowires with Al and Cl Using One Precursor by Chemical Bath Deposition

“…29−34 The use of Sb acetate and Mn acetate was also reported for the doping of ZnO NWs with Sb and Mn, respectively. 35,36 Alternatively, the development of intentional doping with dopants substituting for the oxygen sites in the lattice has been much less investigated. 37,38 Among the halogen-related column, chlorine constitutes one of the most promising dopants.…”

“…The present approach has been developed for a number of dopants ( e.g. , Al, Ga, Cu, Sb, Ni, and Co), most of them substituting for the zinc sites in the lattice and acting as shallow donors or acceptors, respectively. − The use of Sb acetate and Mn acetate was also reported for the doping of ZnO NWs with Sb and Mn, respectively. , Alternatively, the development of intentional doping with dopants substituting for the oxygen sites in the lattice has been much less investigated. , Among the halogen-related column, chlorine constitutes one of the most promising dopants. , Cl – ions have been used to engineer the shape of ZnO nanostructures to form platelets following its adsorption process on the polar c -planes in the low-pH region . Zinc chloride is further a typical chemical precursor to grow ZnO NWs by electrodeposition with an optimized structural morphology and a high density of free electrons above 10 19 cm –3 .…”