Effect of annealing temperature on the structure and optical properties of ZnO nanoparticles
2008; Elsevier BV; Volume: 477; Issue: 1-2 Linguagem: Inglês
10.1016/j.jallcom.2008.10.135
ISSN1873-4669
AutoresJinghai Yang, Xiaoyan Liu, Lili Yang, Yaxin Wang, Yongjun Zhang, Jihui Lang, Ming Gao, Bo Feng,
Tópico(s)Gas Sensing Nanomaterials and Sensors
ResumoZnO nanoparticles (NPs) have been successfully prepared by the chemical precipitation method at a low temperature of 200 °C. X-ray diffraction (XRD), transmission electron microscope (TEM), photoluminescence (PL) and Raman were used to investigate the effect of annealing temperature on the structure and optical properties of ZnO NPs. The XRD analyses revealed that the average size of the as-prepared samples was about 8 nm under 200 °C, which had a good agreement with TEM images. Raman spectra showed that the E2 (high) mode became stronger and sharper with the increase of annealing temperature, but the intensity of phonon peak located at 580 cm−1 was relatively suppressed. The position of ultraviolet (UV) emission peak in the room-temperature PL spectra showed a red-shift when the annealing temperature was increased. In addition, after annealing under 500 °C, the intensity of the UV peak became strongest and the intensity of the green emission almost disappeared, which indicated that ZnO NPs have much better crystallization after annealing.
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