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Your search keyword '"Xianjie Liu"' showing total 3 results
Start Over Author "Xianjie Liu" Topic cathodoluminescence
3 results on '"Xianjie Liu"'

1. Influence of ZnO seed layer precursor molar ratio on the density of interface defects in low temperature aqueous chemically synthesized ZnO nanorods/GaN light-emitting diodes

Author

Galia Pozina, Donata Iandolo, Volodymyr Khranovskyy, Hatim Alnoor, Magnus Willander, Omer Nur, and Xianjie Liu

Subjects
010302 applied physics, Solid-state chemistry, Materials science, Aqueous solution, Wide-bandgap semiconductor, Analytical chemistry, General Physics and Astronomy, chemistry.chemical_element, Cathodoluminescence, 02 engineering and technology, Zinc, Electroluminescence, 021001 nanoscience & nanotechnology, 01 natural sciences, Chemical engineering, chemistry, X-ray photoelectron spectroscopy, 0103 physical sciences, Nanorod, 0210 nano-technology
Abstract

Low temperature aqueous chemical synthesis (LT-ACS) of zinc oxide (ZnO) nanorods (NRs) has been attracting considerable research interest due to its great potential in the development of light-emit ...

Published
2016

2. Effect of precursor solutions stirring on deep level defects concentration and spatial distribution in low temperature aqueous chemical synthesis of zinc oxide nanorods

Author

Omer Nur, Xianjie Liu, Magnus Willander, Chan Oeurn Chey, Volodymyr Khranovskyy, Galia Pozina, and Hatim Alnoor

Subjects
Aqueous solution, Photoluminescence, Materials science, Analytical chemistry, General Physics and Astronomy, chemistry.chemical_element, Cathodoluminescence, Zinc, Condensed Matter Physics, Crystallographic defect, Concentration ratio, lcsh:QC1-999, X-ray photoelectron spectroscopy, chemistry, Nanorod, Den kondenserade materiens fysik, lcsh:Physics
Abstract

Hexagonal c-axis oriented zinc oxide (ZnO) nanorods (NRs) with 120-300 nm diameters are synthesized via the low temperature aqueous chemical route at 80 degrees C on silver-coated glass substrates. The influence of varying the precursor solutions stirring durations on the concentration and spatial distributions of deep level defects in ZnO NRs is investigated. Room temperature micro-photoluminesnce (mu-PL) spectra were collected for all samples. Cathodoluminescence (CL) spectra of the as-synthesized NRs reveal a significant change in the intensity ratio of the near band edge emission (NBE) to the deep-level emission (DLE) peaks with increasing stirring durations. This is attributed to the variation in the concentration of the oxygen-deficiency with increasing stirring durations as suggested from the X-ray photoelectron spectroscopy analysis. Spatially resolved CL spectra taken along individual NRs revealed that stirring the precursor solutions for relatively short duration (1-3 h), which likely induced high super saturation under thermodynamic equilibrium during the synthesis process, is observed to favor the formation of point defects moving towards the tip of the NRs. In contrary, stirring for longer duration (5-15 h) will induce low super saturation favoring the formation of point defects located at the bottom of the NRs. These findings demonstrate that it is possible to control the concentration and spatial distribution of deep level defects in ZnO NRs by varying the stirring durations of the precursor solutions. Funding Agencies|Avdanced Functional Materials (AFM) SFO project at Linkoping Univeristy, Sweden

Published
2015

3. Effect of precursor solutions stirring on deep level defects concentration and spatial distribution in low temperature aqueous chemical synthesis of zinc oxide nanorods.

Author

Alnoor, Hatim, Chan Oeurn Chey, Pozina, Galia, Xianjie Liu, Khranovskyy, Volodymyr, Willander, Magnus, and Nur, Omer

Subjects
ZINC oxide synthesis, NANOROD synthesis, LOW temperatures, CHEMICAL precursors, THERMODYNAMIC equilibrium, CATHODOLUMINESCENCE, X-ray photoelectron spectroscopy
Abstract

Hexagonal c-axis oriented zinc oxide (ZnO) nanorods (NRs) with 120-300 nm diameters are synthesized via the low temperature aqueous chemical route at 80 °C on silver-coated glass substrates. The influence of varying the precursor solutions stirring durations on the concentration and spatial distributions of deep level defects in ZnO NRs is investigated. Room temperature micro-photoluminesnce (μ-PL) spectra were collected for all samples. Cathodoluminescence (CL) spectra of the as-synthesized NRs reveal a significant change in the intensity ratio of the near band edge emission (NBE) to the deep-level emission (DLE) peaks with increasing stirring durations. This is attributed to the variation in the concentration of the oxygen-deficiency with increasing stirring durations as suggested from the X-ray photoelectron spectroscopy analysis. Spatially resolved CL spectra taken along individual NRs revealed that stirring the precursor solutions for relatively short duration (1-3 h), which likely induced high super saturation under thermodynamic equilibrium during the synthesis process, is observed to favor the formation of point defects moving towards the tip of the NRs. In contrary, stirring for longer duration (5-15 h) will induce low super saturation favoring the formation of point defects located at the bottom of the NRs. These findings demonstrate that it is possible to control the concentration and spatial distribution of deep level defects in ZnO NRs by varying the stirring durations of the precursor solutions. [ABSTRACT FROM AUTHOR]

Published
2015
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