کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7938604 | 1513183 | 2018 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Optical and structural properties of individual Co-doped ZnO microwires
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Optical and structural properties of individual Co-doped ZnO microwires Optical and structural properties of individual Co-doped ZnO microwires](/preview/png/7938604.png)
چکیده انگلیسی
The Co-doped ZnO microwires (MWs) were grown using the optical furnace method. We used Scanning electron microscopy (SEM), polarized micro-Raman spectroscopy, photoluminescence (PL) and optical absorption spectroscopy to systematic investigation of the optical and structural properties of Co-doped ZnO MWs. The SEM analysis reveals that Co-doped ZnO MWs has hexagonal facets and cavity inside. The EDS results confirmed the presence and non-uniform distribution of Co impurities in the samples. Co doping of ZnO MWs leads to the decreased intensity, drastically broadening and high-energy shift of the NBE PL band. The red emission band at 1.85â¯eV originates from 2E(2G) â 4A2 (4F) intra-3d-transition of Co2+ in the ZnO lattice has been observed. The intense structured absorption bands within the near infrared ranges 3800-4800 and 5500-9000â¯cmâ1 are caused by electronic spin-allowed transitions 4T2(F) â 4A2(F) and 4T1(F) â 4A2(F) of the tetrahedrally coordinated Co2+ (3â¯d7) ions substituting Zn2+ ions in Co-doped ZnO MWs. Micro-Raman studies of Co doped ZnO MWs show doping/disorder induced additional modes as compared to the undoped sample. The resonant enhancement of the additional local Co-related A1-symmetry Raman mode is observed in the parallel polarization geometryy(z,z)y¯. For the Co doped ZnO MWs, the enhancement of the additional Co-related local vibration mode with an increase in the excitation photon energy is also observed in the Raman spectra.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Superlattices and Microstructures - Volume 118, June 2018, Pages 7-15
Journal: Superlattices and Microstructures - Volume 118, June 2018, Pages 7-15
نویسندگان
O.F. Kolomys, V.V. Strelchuk, S.V. Rarata, R. Hayn, A. Savoyant, F. Giovannelli, F. Delorme, V. Tkach,