Compensation of Zn substitution and secondary phase controls effective mass and weighted mobility in In and Ga co-doped ZnO material

Pristine and (Co, Al) co-doped ZnO nanoparticles have been successfully synthesized by chemical coprecipitation method without using capping agent and annealed in the furnace at 500 °C for one hour. The aluminium concentration is fixed at 5 mol% and cobalt concentration is increasing from 1 to 3 mol%. X-ray diffraction results shows that all the samples possess hexagonal wurtzite structure of ZnO having no secondary phase after adding of aluminium and cobalt, which may be ascribed to the incorporation of cobalt an aluminium ions into the Zinc oxide host lattice site rather than interstitial. Non-uniform spherical nanoparticles were observed through SEM and the elemental analysis is determined through Energy dispersive spectroscopy (EDS). Raman spectrum shows that the prominent peak appeared at 530 cm−1, for co-doped samples which is attributed to the local vibration mode corresponds to cobalt bound with the donor defects.

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Co doped ZnO semiconductor materials: structural, morphological and magnetic properties

Open Physics ◽

10.2478/s11534-011-0063-y ◽

2011 ◽

Vol 9 (6) ◽

Cited By ~ 5

Author(s):

Adriana Popa ◽

Dana Toloman ◽

Oana Raita ◽

Alexandru Biris ◽

Gheorghe Borodi ◽

...

Keyword(s):

Magnetic Properties ◽

Double Exchange ◽

Secondary Phase ◽

Semiconductor Materials ◽

Paramagnetic Resonance ◽

Doped Zno ◽

Electron Paramagnetic ◽

Valence Of Co ◽

Zno Semiconductor ◽

Co Doped

AbstractStructural, morphological and magnetic properties of Zn1−xCoxO (x = 0.01 and 0.03) powdered materials are presented. XRD studies reveal a wurtzite-type structure, while the formation of a Co3O4 secondary phase was evidenced by Raman spectroscopy. A ferromagnetic behaviour with low Curie temperature was evidenced by Electron Paramagnetic Resonance (EPR) investigation. We suggest that the origin of the ferromagnetism in Zn1−xCoxO powders is probably due to the presence of the mixed cation valence of Co ions via a double-exchange mechanism rather than the real doping effect.

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Influence of N Dopant on the Electric and Magnetic Properties of Co Doped ZnO Thin Films

Journal of Inorganic Materials ◽

10.3724/sp.j.1077.2010.00711 ◽

2010 ◽

Vol 25 (7) ◽

pp. 711-716 ◽

Cited By ~ 3

Author(s):

Xue-Tao WANG ◽

Li-Ping ZHU ◽

Zhi-Gao YE ◽

Zhi-Zhen YE ◽

Bing-Hui ZHAO

Keyword(s):

Thin Films ◽

Magnetic Properties ◽

Zno Thin Films ◽

Doped Zno ◽

Co Doped

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Photoluminescence and Magnetic Properties of Undoped and (Mn, Co) co-doped ZnO Nanoparticles

Current Nanoscience ◽

10.2174/1573413715666191010162626 ◽

2020 ◽

Vol 16 (4) ◽

pp. 655-666

Author(s):

Mona Rekaby

Keyword(s):

Magnetic Properties ◽

Zno Nanoparticles ◽

Room Temperature ◽

Magnetic Measurements ◽

Structural Defects ◽

Ferromagnetic Behavior ◽

Secondary Phases ◽

Antiferromagnetic Ordering ◽

Doped Zno ◽

Co Doped

Objective: The influence of Manganese (Mn2+) and Cobalt (Co2+) ions doping on the optical and magnetic properties of ZnO nanoparticles was studied. Methods: Nanoparticle samples of type ZnO, Zn0.97Mn0.03O, Zn0.96Mn0.03Co0.01O, Zn0.95Mn0.03 Co0.02O, Zn0.93Mn0.03Co0.04O, and Zn0.91Mn0.03Co0.06O were synthesized using the wet chemical coprecipitation method. Results: X-ray powder diffraction (XRD) patterns revealed that the prepared samples exhibited a single phase of hexagonal wurtzite structure without any existence of secondary phases. Transmission electron microscope (TEM) images clarified that Co doping at high concentrations has the ability to alter the morphologies of the samples from spherical shaped nanoparticles (NPS) to nanorods (NRs) shaped particles. The different vibrational modes of the prepared samples were analyzed through Fourier transform infrared (FTIR) measurements. The optical characteristics and structural defects of the samples were studied through Photoluminescence (PL) spectroscopy. PL results clarified that Mn2+ and Co2+ doping quenched the recombination of electron-hole pairs and enhanced the number of point defects relative to the undoped ZnO sample. Magnetic measurements were carried out at room temperature using a vibrating sample magnetometer (VSM). (Mn, Co) co-doped ZnO samples exhibited a ferromagnetic behavior coupled with paramagnetic and weak diamagnetic contributions. Conclusion: Mn2+ and Co2+ doping enhanced the room temperature Ferromagnetic (RTFM) behavior of ZnO. In addition, the signature for antiferromagnetic ordering between the Co ions was revealed. Moreover, a strong correlation between the magnetic and optical behavior of the (Mn, Co) co-doped ZnO was analyzed.

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Sol-gel preparation and properties of electroconductive Sn–Al co-doped ZnO coated TiO2 whisker and its applications in textiles

Materials Science in Semiconductor Processing ◽

10.1016/j.mssp.2020.105607 ◽

2021 ◽

Vol 124 ◽

pp. 105607

Author(s):

Ziao Xu ◽

Yanan Zhu ◽

Zengyuan Pang ◽

Mingqiao Ge

Keyword(s):

Sol Gel ◽

Doped Zno ◽

Gel Preparation ◽

Co Doped

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Optimizing physical properties of Co-doped ZnO nanoparticles: Controlling oxygen vacancy and carrier concentration

Vacuum ◽

10.1016/j.vacuum.2021.110488 ◽

2021 ◽

pp. 110488

Author(s):

Huying Yan ◽

Jian Xue ◽

Wenjing Chen ◽

Jialing Tang ◽

Ling zhong ◽

...

Keyword(s):

Oxygen Vacancy ◽

Physical Properties ◽

Carrier Concentration ◽

Zno Nanoparticles ◽

Doped Zno ◽

Co Doped

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Transport mechanisms in Co-doped ZnO (ZCO) and H-irradiated ZCO polycrystalline thin films

Physical Chemistry Chemical Physics ◽

10.1039/d0cp06401g ◽

2021 ◽

Vol 23 (3) ◽

pp. 2368-2376

Author(s):

A. Di Trolio ◽

A. Amore Bonapasta ◽

C. Barone ◽

A. Leo ◽

G. Carapella ◽

...

Keyword(s):

Thin Films ◽

Opposite Effect ◽

Transport Mechanisms ◽

Co Doping ◽

Polycrystalline Thin Films ◽

Doped Zno ◽

Co Doped

Co doping increases the ZnO resistivity (ρ) at high T (HT), whereas it has an opposite effect at low T (LT). H balances the Co effects by neutralizing the ρ increase at HT and strengthening its decrease at LT.

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