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Low Temperature Thermolumınescence Propertıes Of Al-Doped Zno Nanoparticles

Oluşturulma Tarihi: 29-06-2018

Niteleme Bilgileri

Tür: Tez

Alt Tür: Yüksek Lisans Tezi

Yayınlanma Durumu: Yayınlanmamış

Dosya Biçimi: PDF

Dil: İngilizce

Konu(lar): Kimya mühendisliği,

Yazar(lar): Emhemed, Nahad Abdulsalam (Yazar), Işık, Mehmet (Yazar),

Emeği Geçen(ler):

Anahtar Kelimeler

ZnO nanoparticles, Thermoluminescence, Defects


Özet

ZnO nanoparticles doped with aluminium (AZO nanoparticles) were investigated using low temperature thermoluminescence (TL) and structural characterization experiments. Structural properties were studied using x-ray diffraction and scanning electron microscopy experiments. The crystal structure of the AZO nanoparticles was found as hexagonal. XRD diffraction pattern did not present any peak related with doped element. This indicated that doping was successfully carried out. Scanning electron microscopy measurements presented the surface morphology of the nanoparticles and dimensions of nanoparticles were recorded around 100 nm.Low temperature TL experiments were performed on AZO nanoparticles in the temperature range of 10-300 K. TL curve presented one intensive peak around 123 K and two overlapped peaks to intensive peak around 85 K and 150 K. Curve fitting, initial rise, peak shape and different heating rate methods were used to find the activation energies of associated trapping centers. Analyses resulted in the presence of three centers at 44, 76 and 165 meV with peak maximum temperatures of 86.2, 121.5 and 147.1 K, respectively. Peak shape method analyses indicated that μg parameter for observed peaks were between 0.42 and 0.52 indicating the presence of general order of kinetics. TL experiments were alsoivexpanded using different heating rates between 0.1 K/s and 0.7 K/s. Activation energies of trapping centers were obtained using heating rate dependency of peak maximum temperature.Keywords:


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Sosyal Medya ve Araçlar

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