Synthesis and characterization of undoped and TM (Co, Mn) doped ZnO nanoparticles

Nirmala, M. Joyce; Anukaliani, A.

doi:10.1016/j.matlet.2011.06.029

Cited by 47 publications

(12 citation statements)

References 16 publications

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“…ZnO is a semiconductor with a wide band gap (3.3 eV) and a large exciton binding energy and is abundant in nature and environmentally friendly; these characteristics make this material attractive for many applications, including solar cells, optical coatings, photocatalysts, and electrical devices [1]. Researches have shown that ZnO exhibits better photocatalytic efficiency than TiO 2 for the removal of organic compounds in water matrices [2].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization, and Photocatalysis of ZnO and Er‐Doped ZnO

Shi

Zhang

et al. 2013

Journal of Nanomaterials

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ZnO and Er-doped ZnO with different molar ratios of Er/Zn were prepared using the homogeneous precipitation method. The photocatalysts prepared were characterized using scanning electron microscopy, transmission electron microscopy, X-ray diffraction (XRD), UV-vis spectroscopy, and photoluminescence spectroscopy. The results showed that the Er-doped ZnO displayed characteristic wurtzite-type peaks in the XRD spectra. The Er-doped ZnO absorbed much more light than ZnO in the ultraviolet region. And the doping of Er into ZnO enhanced the intensity of the fluorescence emission. The degradation of methylene blue (MB) solution demonstrated that the photocatalytic activity of ZnO was significantly improved with Er doping.

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Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization, and Photocatalysis of ZnO and Er‐Doped ZnO

Shi

Zhang

et al. 2013

Journal of Nanomaterials

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“…Due to Mn doping, the diameter and length of the ZnO nanorods increases slightly compared to the undoped one. 27,30 From the EDAX spectrum (Fig. 2(c)), we have observed that the as grown Zn 1−x Mn x O nanorods contain a small amount of Mn (nearly 5%) with Zn and O.…”

Section: B Surface Topographymentioning

confidence: 97%

Magnetic and optical properties of Mn-doped ZnO vertically aligned nanorods synthesized by hydrothermal technique

2016

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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.

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“…There are several methods that have been used for the preparation of ZnO NPs which include physical methods and wet chemistry to solid-phase systems. However, the physical and chemical methods such as evaporation plasma [10], anodization [11,12], spin on methods [13,14], sputtering [15], ion-assisted deposition [16], reactive ion plating [17], laser ablation [18], filtered arc deposition [19] and atomic layer epitaxy [20] employed for the preparation of ZnO NPs in previous articles have been reported to require very expensive equipments, complex process controls and stringent reaction conditions. Additionally, these methods are responsible for the host of many problems such as generation of hazardous by-products, the use of toxic and flammable solvents, difficult controlling of morphology, very substrate dependent and require high vacuum temperature.…”

Section: Introductionmentioning

confidence: 99%

Pyrolysis of Carbon-Doped ZnO Nanoparticles for Solar Cell Application

Ntozakhe¹,

Taziwa²

2019

Zinc Oxide Based Nano Materials and Devices

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It is very important to find new methods for improving the properties of nanostructured materials that can be used to replace the highly expensive and complicated techniques of fabricating ZnO nano-powders for solar cell applications. Pneumatic spray pyrolysis method offers a relatively inexpensive way of fabricating ZnO nanomaterials of controllable morphology, good crystallinity and uniform size distribution, which makes it a good candidate for the production of ZnO nanoparticles. Additionally, it has the advantage of producing ZnO NPs in one step directly on the substrate without the need for other wet chemistry processes like purification, drying and calcination. To that end, the present study emphasizes more on the design and optimization of spray pyrolysis system as well as on the pneumatic spray pyrolysis conditions for the production of carbon-doped ZnO nanoparticles. The un-doped and carbon-doped ZnO NPs were prepared using pneumatic spray pyrolysis employing zinc acetate as a precursor solution and tetrabutylammonium as a dopant. The fabricated un-doped and C-ZnO NPs were characterized for their morphological, structural and optical properties using SEMEDX, XRD and DRS. SEM analysis has revealed that the fabricated un-doped and C-ZnO NPs have spherical shape with mesoporous morphology. The crosssectional SEM has also revealed that the film thickness changes with increasing dopant concentration from 0.31 to 0.41 μm at higher concentrations. Moreover, the EDX spectra have confirmed the presence of Zn and O atoms in the PSPsynthesized ZnO NPs. XRD analysis of both un-doped and C-ZnO has revealed the peaks belonging to hexagonal Wurtzite structure of ZnO. Additionally, the DRS has revealed a decrease in energy band gap of the synthesized ZnO NPs, with the increase in carbon dopant level.

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Synthesis and characterization of undoped and TM (Co, Mn) doped ZnO nanoparticles

Cited by 47 publications

References 16 publications

Synthesis, Characterization, and Photocatalysis of ZnO and Er‐Doped ZnO

Synthesis, Characterization, and Photocatalysis of ZnO and Er‐Doped ZnO

Magnetic and optical properties of Mn-doped ZnO vertically aligned nanorods synthesized by hydrothermal technique

Pyrolysis of Carbon-Doped ZnO Nanoparticles for Solar Cell Application

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