Stability of ZnO quantum dots tuned by controlled addition of ethylene glycol during their growth

Zimmermann, Lizandra M.; Baldissera, Paulo V; Bechtold, Ivan H.

doi:10.1088/2053-1591/3/7/075018

Cited by 10 publications

(1 citation statement)

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“…This suggests the existence of particles with a significant range of sizes. The bands broaden a more complex growth mechanism due to the aggregation of small particles and coalescence [18]. The optical band gap (Eg) is evaluated by supposing a direct transition between the valence and conduction bands using Tauc's equation [19].…”

Section: Uv-vis Analysismentioning

confidence: 99%

Structural and Optical Properties of ZnO Nanostructures Synthesized by Hydrothermal Method at Different Conditions

Ibrahim

Saleh

Al-Sammarraie

2022

NHC

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ZnO nanostructures were synthesized by hydrothermal method at different temperatures and growth times. The effect of increasing the temperature on structural and optical properties of ZnO were analyzed and discussed. The prepared ZnO nanostructures were characterized by X-ray diffraction (XRD), UV–Vis. absorption spectroscopy (UV–Vis.), Photoluminescence (PL), and scanning electron microscopy (SEM). In this work, hexagonal crystal structure prepared ZnO nanostructures was observed using X-ray diffraction (XRD) and the average crystallite size equal 14.7 and 23.8 nm for samples synthesized at growth time 7 and 8 hours respectively. A nanotubes-shaped surface morphology was found using scanning electron microscopy (SEM). The optical properties showed that the samples had good absorbance in the UV-Vis. region and wide band gap. The PL spectrum displayed that the intensity of ultraviolet (UV), band gap and defect bands depend on the growth temperature of the ZnO nanostructure. The largest band gap was 3.351 eV for ZnO nanostructure synthesized at 100 °C and growth time 8h.

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Section: Uv-vis Analysismentioning

confidence: 99%