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首页> 外文期刊>Philosophical Magazine Letters >Influence of annealing on the photoluminescence of nanocrystalline ZnO synthesized by microwave processing
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Influence of annealing on the photoluminescence of nanocrystalline ZnO synthesized by microwave processing

机译：退火对微波合成纳米ZnO光致发光的影响

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Zinc oxide (ZnO) nanoparticles have been synthesized by a microwave heating method. The resulting powders were annealed at temperatures from 400°C to 800°C for 4 h. The annealed powders were characterized in terms of their structural, morphological, and optical properties by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and room-temperature photoluminescence (PL) spectroscopy, respectively. The XRD patterns of the samples revealed the formation of phase-pure ZnO, apparently without any impurities. However, FT-IR spectra revealed the presence of carboxylate impurities, the signals of which disappear as the annealing temperatures are increased from 400°C to 800°C. SEM pictures showed increasing size ZnO nanoparticles with increase in annealing temperature. The powder annealed at 800°C is identified as hexagonal wurzite ZnO. The improved PL spectral performance of the ZnO powder correlates well with the improved crystalline quality of the nanoparticles, as revealed by the XRD and PL. Sharp ultraviolet (UV) band edge luminescence has been observed at 375 nm, which is suitable for application in UV light emitting devices. The results also showed that the excitation wavelength dependence of the luminescence arises from quantum confinement effects.View full textDownload full textKeywordszinc oxide, nanopowders, microwave processing, annealing, SEM, XRD, FT-IR, photoluminescenceRelated var addthis_config = { ui_cobrand: "Taylor & Francis Online", services_compact: "citeulike,netvibes,twitter,technorati,delicious,linkedin,facebook,stumbleupon,digg,google,more", pubid: "ra-4dff56cd6bb1830b" }; Add to shortlist Link Permalink http://dx.doi.org/10.1080/09500839.2012.725947
机译：氧化锌（ZnO）纳米颗粒已经通过微波加热方法合成。所得粉末在从400°C到800°C的温度下退火4小时。通过X射线衍射（XRD），傅立叶变换红外光谱（FT-IR），扫描电子显微镜（SEM）和室温光致发光（PL）对退火后的粉末进行结构，形态和光学性能表征）光谱。样品的XRD图谱表明形成了纯相ZnO，显然没有任何杂质。但是，FT-IR光谱揭示了羧酸盐杂质的存在，随着退火温度从400°C升高到800°C，羧酸盐杂质的信号消失了。 SEM照片显示随着退火温度的升高，ZnO纳米颗粒的尺寸增加。在800°C退火的粉末被确定为六角纤锌矿ZnO。如XRD和PL所揭示的，ZnO粉末的改善的PL光谱性能与纳米颗粒的改善的晶体质量良好相关。在375 nm处观察到了尖锐的紫外线（UV）带边缘发光，它适用于UV发光器件。结果还表明，发光的激发波长依赖性源于量子限制效应。查看全文下载全文关键词氧化锌，纳米粉末，微波处理，退火，SEM，XRD，FT-IR，光致发光相关的var addthis_config = {ui_cobrand：“ Taylor＆弗朗西斯在线”，services_compact：“ citeulike，netvibes，twitter，technorati，美味，linkedin，facebook，stumbleupon，digg，google，更多”，发布号：“ ra-4dff56cd6bb1830b”};添加到候选列表链接永久链接http://dx.doi.org/10.1080/09500839.2012.725947

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