| Yazarlar |
Egbuchunam Theresa
|
Dr. Öğr. Üyesi Senem YETGİN
Kastamonu Üniversitesi, Türkiye |
|
Ozmihci Omurlu Filiz
|
|
Balköse Devrim
|
| Özet |
| Zinc oxide (ZnO) nanoparticles were synthesized by conventional (ZnO-A) and supercritical ethanol drying (ZnO-B). Nitrogen adsorption/desorption analyses were performed to determine the surface areas of the powders. The specific surface area was 28.30m2/g and 10.61 m2/g for ZnO-A and ZnO-B respectively. The powders adsorbed very small amount of CO2with the conventionally dried powder adsorbing more CO2. Supercritical ethanol dried ZnO had ethanol on its surface which was eliminated by vacuum application at room temperature. Both powders had OH groups which were eliminated on heating up to 500°C under vacuum. However, OH groups were present in lower amounts in supercritical ethanol dried ZnO. The powders were characterized by UV-VIS optical absorption and room temperature photoluminescence spectroscopic analyses. The UV-VIS absorption spectrum showed an absorption band at 375nm due to ZnO nanoparticles. The photoluminescence spectrum of ZnO excited at 380nm exhibited three emission peaks: one at 424nm and 490nm corresponding to band gap excitonic emission and another located at 520nm due to the presence of singly ionized oxygen vacancies. |
| Anahtar Kelimeler |
| In situ drift FTIR spectroscopy | Luminescence | Nitrogen and carbon dioxide adsorption | Supercritical ethanol drying | Zinc oxide nanoparticles |
| Makale Türü | Özgün Makale |
| Makale Alt Türü | Diğer hakemli uluslarası dergilerde yayımlanan tam makale |
| Dergi Adı | International Journal of Applied Engineering Research |
| Dergi ISSN | 0973-4562 |
| Makale Dili | İngilizce |
| Basım Tarihi | 01-2014 |
| Cilt No | 9 |
| Sayı | 21 |
| Sayfalar | 11631 / 11645 |
| Makale Linki | https://openaccess.iyte.edu.tr/bitstream/11147/5656/1/5656.pdf |
