scholarly journals Unveiling Semiconductor Nanostructured Based Holmium-Doped ZnO: Structural, Luminescent and Room Temperature Ferromagnetic Properties

Nanomaterials ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2611
Author(s):  
Guy L. Kabongo ◽  
Gugu H. Mhlongo ◽  
Mokhotjwa S. Dhlamini

This research work describes the synthesis of ZnO nanostructures doped with Ho3+ ions using a conventional sol–gel synthesis method. The nanostructured produced exhibited a wurtzite hexagonal structure in both ZnO and ZnO:Ho3+ (0.25, 0.5, 0.75 mol%) samples. The change in morphology with addition of Ho3+ dopants was observed, which was assigned to Ostwald ripening effect occurring during the nanoparticles’ growth. The photoluminescence emission properties of the doped samples revealed that Ho3+ was emitting through its electronic transitions. Moreover, reduced surface defects were observed in the Holmium doped samples whose analysis was undertaken using an X-ray Photoelectron Spectroscopy (XPS) technique. Finally, enhanced room temperature ferromagnetism (RT-FM) for Ho3+-doped ZnO (0.5 mol%) samples with a peak-to-peak line width of 452 G was detected and found to be highly correlated to the UV–VIS transmittance results.

2014 ◽  
Vol 556-562 ◽  
pp. 429-432
Author(s):  
Ping Cao ◽  
Yue Bai ◽  
Zhi Qu

Successful synthesis of room-temperature ferromagnetic semiconductors, (Cu, Co) co-doped ZnO film is obtained by sol-gel method. It is found that the essential ingredient in achieving room-temperature ferromagnetism is Cu co-doping. By Hall-effect measurement ap-type conductivity was observed for the Cu co-doped films, which induced the room-temperature ferromagnetism.


2007 ◽  
Vol 310 (2) ◽  
pp. 2092-2094 ◽  
Author(s):  
Y. Belghazi ◽  
G. Schmerber ◽  
S. Colis ◽  
J.L. Rehspringer ◽  
A. Berrada ◽  
...  

2012 ◽  
Vol 15 (3) ◽  
pp. 314-318 ◽  
Author(s):  
Prateek Varshney ◽  
Gunjan Srinet ◽  
Ravindra Kumar ◽  
Vivek Sajal ◽  
S.K. Sharma ◽  
...  

2013 ◽  
Vol 117 (17) ◽  
pp. 8968-8973 ◽  
Author(s):  
Nadeem Tahir ◽  
Altaf Karim ◽  
Kristin A. Persson ◽  
Syed Tajammul Hussain ◽  
Alejandro G. Cruz ◽  
...  

2014 ◽  
Vol 122 ◽  
pp. 234-236 ◽  
Author(s):  
Xiaohong Yu ◽  
Changzhen Liu ◽  
Dawei Meng ◽  
Can Lu ◽  
Jie Liu ◽  
...  

NANO ◽  
2012 ◽  
Vol 07 (04) ◽  
pp. 1250028 ◽  
Author(s):  
BAPPADITYA PAL ◽  
SOUMEN DHARA ◽  
P. K. GIRI

We report on the growth of Co -doped ZnO nanowires (NWs) on Si substrate using a self-catalytic vapor deposition method from a Co -doped ZnO nanopowder source and study its structural, optical and magnetic properties for the as-grown and rapid thermal annealed samples. Co (5%)-doped ZnO ( ZnCoO ) nanoparticles (NPs) are used as source material for the growth process. Electron microscopy imaging clearly reveals the formation of long ZnO NWs with uniform diameter. X-ray diffraction analysis confirms the single crystalline hexagonal structure of Co -doped ZnO NWs without impurities of metallic cobalt or other phases. Micro-Raman studies of doped samples show doping/disorder induced additional modes as compared to the undoped ZnO . Room temperature photoluminescence spectra of the doped ZnO NWs show strong emission band at ~380 nm and no significant emission was observed in the visible region indicating low defect content in the NWs. The field dependent magnetization (M–H curve) measured at room temperature exhibits paramagnetic nature for the NWs with the magnetic moment in the range 2–3.7 milli-emu/cm2 for the applied field of 2 Tesla, while the source ZnCoO NPs exhibit room temperature ferromagnetism with saturation magnetization ~6 emu/g. Possible mechanism of alteration in magnetic behavior in doped NWs are discussed based on the growth conditions and role of defects.


Rare Metals ◽  
2013 ◽  
Vol 32 (2) ◽  
pp. 165-168 ◽  
Author(s):  
M. Hassan Farooq ◽  
Hai-Ling Yang ◽  
Xiao-Guang Xu ◽  
Cong-Jun Ran ◽  
Jun Miao ◽  
...  

2021 ◽  
Vol 529 ◽  
pp. 167908
Author(s):  
Cai-Qin Luo ◽  
Si-Cong Zhu ◽  
Chi Xu ◽  
Shengqiang Zhou ◽  
Chi-Hang Lam ◽  
...  

Sign in / Sign up

Export Citation Format

Share Document