Influences of Co doping on the structural, optical and magnetic properties of ZnO nanorods synthesized by hydrothermal route

Wang, Baiqi; Xia, Chunhui; Iqbal, Javed; Tang, Naijun; Sun, Zheng; Lv, Yan; Wu, Luyi

doi:10.1016/j.solidstatesciences.2009.04.024

Cited by 57 publications

(34 citation statements)

References 33 publications

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“…The crystal structure of GZO nanorods indicated a reduced crystallite quality of the ZnO nanorods (NRs) due to the incorporation of Ga atoms into the ZnO lattice network [17][18][19], and our PL spectra results are in agreement with previous reports suggesting that Ga doping improves the optical properties of ZnO NR arrays [14,20] . Inventions 2016, 1, 3 4 of 6 zinc, 56.33% oxygen and 3.57% gallium as shown in Table 1.…”

Section: Resultssupporting

confidence: 91%

Synthesis of Ga-Doped ZnO Nanorods by Hydrothermal Method and Their Application to Ultraviolet Photodetector

et al. 2016

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Abstract:In this study, high-density single crystalline Ga-doped ZnO (GZO) nanorods were grown on glass substrate by the hydrothermal method. The structural and optoelectronic properties of Ga-doped ZnO nanorods were studied. The microstructure of the GZO was studied by scanning electrical microscope (SEM). The structural characteristics of the GZO were measured by X-ray diffraction (XRD). It was found that the peaks related to the wurtzite structure ZnO (100), (002), and (101) diffraction peaks. The (002) peak indicates that the nanorods were preferentially oriented in the c-axis direction. The existence of Ga was examined by energy diffraction spectra (EDS), indicating the Ga atom entered into the ZnO lattice. The optical properties of the GZO were measured by photoluminescence spectra. It was found that all GZO nanorod arrays showed two different emissions, including UV (ultraviolet) and green emissions. GZO nanorod metal-semiconductor-metal (MSM) ultraviolet (UV) photodetectors (PD) were also fabricated. The photo-current and dark-current constant ratio of the fabricated PD was approximately 15.2 when biased at 1 V.

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Section: Resultssupporting

confidence: 91%

Synthesis of Ga-Doped ZnO Nanorods by Hydrothermal Method and Their Application to Ultraviolet Photodetector

et al. 2016

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“…4c) shows that there is a good fit between the ZC1-4 films and the Co 2+ standard [3,5]. The spectra depict the characteristic peaks for Co2p 3/2 and Co2p 1/2 (Table 1), along with satellite peaks (~795 and ~812 eV) which are specifically connected with the +2 ionic state of Co [14,24]. Taken [25], it is also noted that there is some small variation of the spectral line shapes and peak BE indicating that the local electronic structure of the Co impurities in ZnO depends (weakly) on doping concentration.…”

Section: Xpsmentioning

confidence: 78%

Solution-based synthesis of cobalt-doped ZnO thin films

et al. 2012

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Publisher rights This is the author's version of a work that was accepted for publication in Thin Solid Films. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Thin Solid Films, Vol. 524, 01/12/2012 General rights Copyright for the publications made accessible via the Queen's University Belfast Research Portal is retained by the author(s) and / or other copyright owners and it is a condition of accessing these publications that users recognise and abide by the legal requirements associated with these rights.Take down policy The Research Portal is Queen's institutional repository that provides access to Queen's research output. Every effort has been made to ensure that content in the Research Portal does not infringe any person's rights, or applicable UK laws. If you discover content in the Research Portal that you believe breaches copyright or violates any law, please contact openaccess@qub.ac.uk. This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT1 Solution-based synthesis of cobalt-doped ZnO thin films Sesha VempatiSchool of Mathematics and Physics, Queen's University Belfast, BT7 1NN, UK, Amitha ShettyMaterials Research Center, Indian Institute of Science, Bangalore -560012, India. P. Dawson*School of Mathematics and Physics, Queen's University Belfast, BT7 1NN, UK, K. K. Nanda and S.B. KrupanidhiMaterials Research Center, Indian Institute of Science, Bangalore -560012, India.Corresponding author: p.dawson@qub.ac.uk AbstractUndoped and cobalt-doped (1-4 wt%) ZnO polycrystalline, thin films have been fabricated on quartz substrates using sequential spin-casting and annealing of simple salt solutions. X-ray diffraction (XRD) reveals a wurzite ZnO crystalline structure with high-resolution transmission electron microscopy showing lattice planes of separation 0.26 nm, characteristic of (002) planes.The Co appears to be tetrahedrally co-ordinated in the lattice on the Zn sites (XRD) and has a charge of +2 in a high-spin electronic state (X-ray photoelectron spectroscopy). Co-doping does not alter the wurzite structure and there is no evidence of the precipitation of cobalt oxide phases within the limits of detection of Raman and XRD analysis. Lattice defects and chemisorbed oxygen are probed using photoluminescence and Raman spectroscopy -crucially, however, this transparent semiconduc...

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“…Figure 1 shows the PL spectrum for 0% (pure, undoped) ZnO, 3% , 5%and 10 % cobalt-doped ZnO nanorods. Both the pure and cobalt-doped ZnO nanorods exhibited sharp peaks in the UV and broad lines in the visible region [7,8]. The main trend we can observe from PL intensity is that the emission intensity of the ZnO nanorods in the UV region reaches the highest value for the pure, undoped ZnO nanorods, but decreases with increased cobalt-doping.…”

Section: Contributedmentioning

confidence: 81%

“…The spectra can be divided into two main regions: the ultraviolet (UV) region and the visible light (VL) region. The strong, spontaneous UV emission originated from the excitonic recombination corresponding to the near-band edge emission of ZnO or in other words, the recombination of free excitons through an exciton-exciton combination process [7][8][9].…”

Section: Resultsmentioning

confidence: 99%

Cobalt doping, etching, and attachment of gold nanoparticles and quantum dots on ZnO nanorods

Hari

Spencer

Hor

et al. 2011

Phys. Status Solidi C

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ZnO is an important material for optoelectronic applications such as solar cells and sensors due to its wide band gap and functional properties. Optimizing the growth mechanisms of ZnO nanorods as grown in a low temperature, wet chemical method will allow for an enhancement of material, optical, and electronic properties in a low cost production method. Our group fabricated nanorods on indium tin oxide (ITO) and glass substrates. The alignment and optical properties of the ZnO nanorods depend greatly on the initial seed layer of (doped) ZnO as well as the growth parameters. In this study we investigated the changes in the optical absorption properties of ZnO nanorods doped with cobalt. Cobalt doping was achieved by adding a percentage of cobalt chloride to the total volume of chemical bath precursor solution of Zinc nitrate and hexamethylentramine. Optical and energy dispersive X‐ray measurements reveal that the optical absorption of ZnO nanorods extends from 385 nm to 700 nm when doped with cobalt from 0.1 at.% to 9.7 at.%. In addition, we investigated the selective etching of ZnO with 3 molar concentrations of potassium chloride solution. Etching under 3 molar solution concentration produced ZnO nanotube structures that can be used for enhancing optical and chemical sensitivity. We also present absorption profiles of ZnO nanorods decorated with metallic nano particles of gold as well as CdSe quantum dots (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Influences of Co doping on the structural, optical and magnetic properties of ZnO nanorods synthesized by hydrothermal route

Cited by 57 publications

References 33 publications

Synthesis of Ga-Doped ZnO Nanorods by Hydrothermal Method and Their Application to Ultraviolet Photodetector

Synthesis of Ga-Doped ZnO Nanorods by Hydrothermal Method and Their Application to Ultraviolet Photodetector

Solution-based synthesis of cobalt-doped ZnO thin films

Cobalt doping, etching, and attachment of gold nanoparticles and quantum dots on ZnO nanorods

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