Raman spectra of single micrometer-sized tubular ZnO

Zeng, Dong; Zhang, Chunfeng; Deng, Hui; You, Guofeng; Shen, Qian

doi:10.1016/j.matchemphys.2005.10.005

Cited by 51 publications

(23 citation statements)

References 18 publications

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“…The spectra agree well with earlier reports. [22][23][24][25] It also indicates that our samples have the same lattice constant as crystalline bulk ZnO.…”

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confidence: 56%

Magnetophotoluminescence properties of Co-doped ZnO nanorods

Lin

Wang

Lee

et al. 2009

Applied Physics Letters

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We present the detailed experimental results of the magnetic and optical properties of cobalt doped ZnO nanorods, especially the temperature and magnetic field dependence of photoluminescence up to 14 T. The Raman measurements indicate that our Co-doped ZnO nanorods have the same lattice constant as crystalline bulk ZnO. Sharp luminescence peaks centered at around 670 nm were observed at low temperature and their intensity decreased with increasing magnetic field. The luminescence peaks were attributed to d-d transitions in the Ligand field from the doped Co ions. We also observed a diamagnetic shift at a temperature of 1.5 K when the magnetic field was scanned from 0 to 14 T. The exciton radius of the Co-doped ZnO nanorods was deduced from the magnetophotoluminescence results

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“…The spectra agree well with earlier reports. [22][23][24][25] It also indicates that our samples have the same lattice constant as crystalline bulk ZnO.…”

mentioning

confidence: 56%

Magnetophotoluminescence properties of Co-doped ZnO nanorods

Lin

Wang

Lee

et al. 2009

Applied Physics Letters

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“…A sharp strong peak located at 436 cm -1 due to E 2H mode, this is the intrinsic characteristic of the Raman-active mode of wurtzite hexagonal ZnO. A broad peak around 1150 cm -1 was also observed in large wavenumber region which corresponds to the optical overtone [38,39]. The well defined acoustic overtones E 2H modes in zinc oxide prepare from different zinc salt (chloride, nitrate and sulphate) are shown in figure 11.…”

Section: Resultsmentioning

confidence: 99%

Synthesis from zinc oxalate, growth mechanism and optical properties of ZnO nano/micro structures

Raj

Joshi

Varma

2011

Cryst. Res. Technol.

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We report the synthesis of various morphological micro to nano structured zinc oxide crystals via simple precipitation technique. The growth mechanisms of the zinc oxide nanostructures such as snowflake, rose, platelets, porous pyramid and rectangular shapes were studied in detail under various growth conditions. The precursor powders were prepared using several zinc counter ions such as chloride, nitrate and sulphate along with oxalic acid as a precipitating agent. The precursors were decomposed by heating in air resulting in the formation of different shapes of zinc oxide crystals. Variations in ZnO nanostructural shapes were possibly due to the counter ion effect. Sulphate counter ion led to unusual rose-shape morphology. Strong ultrasonic treatment on ZnO rose shows that it was formed by irregular arrangement of micro to nano size hexagonal zinc oxide platelets. The X-ray diffraction studies confirmed the wurzite structure of all zinc oxide samples synthesized using different zinc counter ions. Functional groups of the zinc oxalate precursor and zinc oxide were identified using micro Raman studies. The blue light emission spectra of the various morphologies were recorded using luminescence spectrometer.

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“…The wurtzite structure of ZnO belong to the space group C 4 6v with two formula units per primitive cell and all the atoms occupy the C 3v sites which give theoretically six Raman active phonon modes. For pure ZnO the sharpest and strongest peak is at 437 cm −1 which is assigned to the highest frequency (E 2 high) branch of E 2 mode [22]. The peaks at 330 and 379 cm −1 are assigned to the second-order vibration mode and the transverse-optical mode (TO) with A 1 symmetry respectively.…”

Section: Characterization Of Cofe 2 O 4 -Zno Nanostructurementioning

confidence: 99%