http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Douaa El-Said Bakeer (검색결과 1 건)
- 무료
- 기관 내 무료
- 유료
-
Structural, Optical and Room Temperature Magnetic Study of Mn-Doped ZnO Nanoparticles
Majed Sharrouf,Ramadan Awad,Salem Marhaba,Douaa El-Said Bakeer 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.4
Undoped and Mn-doped ZnO nanoparticles (Zn1-xMnxO), with nominal weight percentages (0:00 ≤ x ≤ 0.10), have been synthesized by co-precipitation technique. The synthesized nanoparticles are characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), ultraviolet-visible spectroscopy (UV) and Fourier transform infrared spectroscopy (FTIR). From XRD analysis, the compound ZnMnO3 is formed for x ≥ 0.05 with cubic structure (a = 8.3694 Å) and its concentration increases with x. Moreover, XRD analysis reveals the wurtzite hexagonal crystal structure for ZnO. The lattice parameters (a and c) of Zn1-xMnxO are calculated and they increase with the doping concentration of Mn as a consequence of the larger ionic size of Mn2+ ions compared to Zn2+ ions. The crystallite size is calculated for all the samples using Debye– Scherrer's method (SSM), Williamson–Hall methods (UDM, USDM and UDEDM) and SizeStrain Plot method (SSP), and the results are in good agreement with TEM. The presence of functional groups and the chemical bonding is confirmed by FTIR spectra that shows a peak shift between undoped and doped ZnO. The energy bandgap (Eg) is calculated for different concentrations of Mn (0.00 ≤ x ≤ 0.10) by using the UV-visible optical spectroscopy, between 300 nm and 800 nm, showing a noticeable drop in Eg with x. At room temperature, the magnetization of the samples reveals the intrinsic ferromagnetic (FM) behavior of undoped ZnO, ferromagnetic behavior of ZnxMn1-xO (0.01 ≤ x ≤ 0.03) and the co-existence of ferromagnetic and paramagnetic behavior for ZnxMn1-xO (0.05 ≤ x ≤ 0.10). This ferromagnetism is decreased for the doped samples as a consequence of antiferromagnetic coupling between Mn ions. The two samples correspond to x = 0.01 and x = 0.10, tend to be superparamagnetic because of the formation of single domain particles as a consequence of small particle size. x = 0.03 shows an optimum value of Mn concentration for maximum saturation magnetization and the best ferromagnetic nature.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
