Photoluminescence and Raman scattering of Cu-doped ZnO films prepared by magnetron sputtering

Wang, X.B.; Song, Cheng; Geng, Kuiwei; Zeng, Fei; Pan, Feng

doi:10.1016/j.apsusc.2007.02.013

Cited by 171 publications

(72 citation statements)

References 30 publications

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“…The full width at half-maximum (FWHM) value of the undoped ZnO sample is 3.36 , which indicates excellent alignment of the nanorods perpendicular to the substrate surface. A very similar value of XRC FWHM was reported by Wang et al 37 for Cudoped ZnO films synthesized with magnetron sputtering. On the other hand, Yanmei et al 38 found a larger FWHM value of 10.4 for undoped ZnO in hydrothermal grown Ni:ZnO nanorods.…”

Section: Resultssupporting

confidence: 87%

Effects of Cu diffusion-doping on structural, optical, and magnetic properties of ZnO nanorod arrays grown by vapor phase transport method

Yılmaz¹,

McGlynn²,

Bacaksız³

et al. 2012

Journal of Applied Physics

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Realization of a 33 GHz phononic crystal fabricated in a freestanding membrane AIP Advances 1, 042001 (2011) Preparation of uncapped CdSe1xSx semiconducting nanocrystals by mechanical alloying J. Appl. Phys. 110, 124306 (2011) Formation mechanisms of spatially-directed zincblende gallium nitride nanocrystals J. Appl. Phys. 110, 124307 (2011) Surface modification of monocrystalline zinc oxide induced by high-density electronic excitation J. Appl. Phys. 110, 124310 (2011) Investigation of poly(o-anisidine)-SnO2 nanocomposites for fabrication of low temperature operative liquefied petroleum gas sensor J. Appl. Phys. 110, 124501 (2011) Additional information on J. Appl. Phys. Well-aligned ZnO nanorods were prepared by the vapor phase transport method on Si covered with a ZnO buffer layer. After the nanostructure growth, Cu was doped into the ZnO nanorods by diffusion at three different temperatures and for different times. Undoped and Cu diffusion-doped ZnO samples are highly textured, with the c axis of the wurtzite structure along the growth direction. The incorporation of Cu caused some slight changes in the nanorod alignment, although the wurtzite crystal structure was maintained. X-ray photoelectron spectroscopy measurements revealed that Cu ions were in a divalent state and substituted for the Zn 2þ ions of the ZnO matrix. Photoluminescence results at 10 K indicate that the incorporation of copper leads to a relative increase of Cu-related structured green band deep level intensity. Magnetic measurements revealed that both undoped and Cu diffusion-doped ZnO samples exhibited room temperature ferromagnetism. It was also found that bound magnetic polarons play an important role in the appearance of room temperature ferromagnetism in Cu diffusion-doped ZnO nanorods.

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Section: Resultssupporting

confidence: 87%

Effects of Cu diffusion-doping on structural, optical, and magnetic properties of ZnO nanorod arrays grown by vapor phase transport method

Yılmaz¹,

McGlynn²,

Bacaksız³

et al. 2012

Journal of Applied Physics

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“…All details of three stages of growth procedure can be found in [22,24]. ZnO thin films grown by magnetron sputtering method [26]. On the contrary, the study reported by Yanmei and co-workers showed that undoped ZnO nanorods had a larger FWHM value of 10.4° for hyrothermal synthesized ZnO:Ni samples [27].…”

Section: Methodsmentioning

confidence: 99%

Defect-mediated ferromagnetism in ZnO:Mn nanorods

et al. 2013

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In this work, the structural, chemical and magnetic properties of ZnO:Mn nanorods were investigated. Firstly, well-aligned ZnO nanorods with their long axis parallel to the crystalline c-axis were successfully grown by the vapor phase transport technique on Si substrates coated with a ZnO buffer layer. Mn metal was then diffused into these nanorods at different temperatures in vacuum. From SEM results, ZnO:Mn nanorods were observed to have diameters of ~100 nm and lengths of 4 µm. XPS analysis showed that the Mn dopant substituted into the ZnO matrix with a valence state of +2. Magnetic measurements performed at room temperature revealed that undoped ZnO nanorods exhibit ferromagnetic behavior which may be related to oxygen vacancy defect-mediated d 0 ferromagnetism. ZnO:Mn samples were seen to show an excess room temperature ferromagnetism that is attributed to the presence of oxygen vacancy defects forming bound magnetic polarons involving Mn.

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“…The band at 384 nm is the UV near-band edge emission. 36,37 The other broad band, peaking at 440 nm, was attributed to the deep defect levels of oxygen vacancies or interstitial zinc ions. [38][39][40][41] Vendhausen et al 42 assigned the green emission at 510 nm to the transition between the photoexcited holes and singly ionized oxygen vacancy.…”

Section: Salah Et Almentioning

confidence: 99%

High-energy ball milling technique for ZnO nanoparticles as antibacterial material

Salah¹,

Habib²,

Khan³

et al. 2011

IJN

219

107

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Nanoparticles of zinc oxide (ZnO) are increasingly recognized for their utility in biological applications. In this study, the high-energy ball milling (HEBM) technique was used to produce nanoparticles of ZnO from its microcrystalline powder. Four samples were ball milled for 2, 10, 20, and 50 hours, respectively. The structural and optical modifications induced in the ‘as synthesized’ nanomaterials were determined by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM), and photoluminescence emission spectra (PL). SEM and TEM results show a gradual decrease in particle size from around 600 to ∼30 nm, with increased milling time. The initial microstructures had random shapes, while the final shape became quite spherical. XRD analysis showed ZnO in a hexagonal structure, broadening in the diffracted peaks and going from larger to smaller particles along with a relaxation in the lattice constant c . The value of c was found to increase from 5.204 to 5.217 Å with a decrease in particle size (600 to ∼30 nm). PL result showed a new band at around 365 nm, whose intensity is found to increase as the particles size decreases. These remarkable structural and optical modifications induced in ZnO nanoparticles might prove useful for various applications. The increase in c value is an important factor for increasing the antibacterial effects of ZnO, suggesting that the HEBM technique is quite suitable for producing these nanoparticles for this purpose.

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Photoluminescence and Raman scattering of Cu-doped ZnO films prepared by magnetron sputtering

Cited by 171 publications

References 30 publications

Effects of Cu diffusion-doping on structural, optical, and magnetic properties of ZnO nanorod arrays grown by vapor phase transport method

Effects of Cu diffusion-doping on structural, optical, and magnetic properties of ZnO nanorod arrays grown by vapor phase transport method

Defect-mediated ferromagnetism in ZnO:Mn nanorods

High-energy ball milling technique for ZnO nanoparticles as antibacterial material

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