MAGNETIC PROPERTIES OF ONE-DIMENSIONAL Sm-DOPED ZnO NANOSTRUCTURES FABRICATED BY HYDROTHERMAL METHOD

2013 ◽  
Vol 27 (22) ◽  
pp. 1350161 ◽  
Author(s):  
C. C. LIN ◽  
C. Y. KUNG ◽  
S. L. YOUNG ◽  
H. Z. CHEN ◽  
M. C. KAO ◽  
...  
Keyword(s):  
Oxygen Vacancies ◽  
Zno Nanorods ◽  
Magnetization Measurement ◽  
Hexagonal Structure ◽  
Diffraction Peak ◽  
Zno Nanostructures ◽  
One Dimensional ◽  
Doped Zno ◽  
Single Diffraction ◽  
Xrd Patterns

Well-defined ZnO and Sm -doped nanorods have been successfully fabricated by a low temperature hyderthermal process. The XRD patterns of both compositions with single diffraction peak (002) show the same wurtzite hexagonal structure. The radius of Sm - ZnO nanorods observed by FE-SEM is smaller than that of pure ZnO indicating the reduction of growth rate by the doping of Sm . Ferromagnetism is observed from the results of magnetization measurement. The increase of the saturation magnetization and decrease of coercivity reveal an association with the increase of oxygen vacancies induced by the doping of the Sm in the nanorods.

Facile synthesis of one-dimensional Fe-doped ZnO nanostructures from a single-source inorganic precursor

2014 ◽  
Vol 135 ◽  
pp. 107-109 ◽  
Author(s):  
Shuang Yue ◽  
Lianying Wang ◽  
Dingheng Zhang ◽  
Shuangxia Yang ◽  
Xiaodi Guo ◽  
...  
Keyword(s):  
Zno Nanostructures ◽  
Single Source ◽  
Facile Synthesis ◽  
One Dimensional ◽  
Inorganic Precursor ◽  
Doped Zno

Magnetic Properties of One-Dimensional Sm-Doped ZnO Nanostructures Fabricated by Hydrothermal Method

2013 ◽  
Vol 26 (6) ◽  
pp. 2171-2173 ◽  
Author(s):  
C. C. Lin ◽  
C. Y. Kung ◽  
S. L. Young ◽  
H. Z. Chen ◽  
M. C. Kao ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Hydrothermal Method ◽  
Zno Nanostructures ◽  
One Dimensional ◽  
Doped Zno

Magnetic and optical property studies on controlled low-temperature fabricated one-dimensional Cr doped ZnO nanorods

CrystEngComm ◽  
2010 ◽  
Vol 12 (6) ◽  
pp. 1887 ◽  
Author(s):  
G. Mohan Kumar ◽  
P. Ilanchezhiyan ◽  
Jin Kawakita ◽  
M. Subramanian ◽  
R. Jayavel
Keyword(s):  
Optical Property ◽  
Low Temperature ◽  
Zno Nanorods ◽  
One Dimensional ◽  
Doped Zno

Cathodoluminescence Quenching in Yb-Doped ZnO Nanostructures

2009 ◽  
Vol 5 ◽  
pp. 177-183 ◽  
Author(s):  
A. Susarrey-Arce ◽  
M. Herrera-Zaldívar ◽  
W. de la Cruz ◽  
Umapada Pal
Keyword(s):  
Energy Transfer ◽  
Thermal Treatment ◽  
Point Defects ◽  
Chemical Method ◽  
Oxygen Vacancies ◽  
Energy Transfer Process ◽  
Physical Method ◽  
Zno Nanostructures ◽  
Physical Methods ◽  
Doped Zno

Cathodoluminescence (CL) quenching was observed in ZnO nanostructures when doped with Yb by both chemical and physical methods. CL spectra of the samples revealed a defect emission at 2.25 eV in samples prepared by the chemical method, and an emission at 2.5 eV in samples prepared by the physical method. From the thermal treatment studies, it was found that oxygen vacancies are responsible for the 2.5 eV emission. Observed CL quenching in ZnO is explained through the participation of point defects in the energy transfer process from ZnO to Yb3+.

Suppression of defect level emissions in low temperature fabricated one-dimensional Mn doped ZnO nanorods

2013 ◽  
Vol 24 (8) ◽  
pp. 2989-2994 ◽  
Author(s):  
G. Mohan Kumar ◽  
P. Ilanchezhiyan ◽  
Jin Kawakita ◽  
Jinsub Park ◽  
R. Jayavel
Keyword(s):  
Low Temperature ◽  
Zno Nanorods ◽  
Defect Level ◽  
One Dimensional ◽  
Doped Zno ◽  
Mn Doped

scholarly journals One Dimensional ZnO Nanostructures: Growth and Chemical Sensing Performances

Nanomaterials ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1940
Author(s):  
Abderrahim Moumen ◽  
Navpreet Kaur ◽  
Nicola Poli ◽  
Dario Zappa ◽  
Elisabetta Comini
Keyword(s):  
Chemical Sensors ◽  
Chemical Sensing ◽  
Low Cost ◽  
Zno Nanorods ◽  
Fast Response ◽  
Zno Nanostructures ◽  
One Dimensional ◽  
1D Nanostructures ◽  
Transmission Electron ◽  
Vls Growth

Recently, one-dimensional (1D) nanostructures have attracted the scientific community attention as sensitive materials for conductometric chemical sensors. However, finding facile and low-cost techniques for their production, controlling the morphology and the aspect ratio of these nanostructures is still challenging. In this study, we report the vapor-liquid-solid (VLS) synthesis of one dimensional (1D) zinc oxide (ZnO) nanorods (NRs) and nanowires (NWs) by using different metal catalysts and their impact on the performances of conductometric chemical sensors. In VLS mechanism, catalysts are of great interest due to their role in the nucleation and the crystallization of 1D nanostructures. Here, Au, Pt, Ag and Cu nanoparticles (NPs) were used to grow 1D ZnO. Depending on catalyst nature, different morphology, geometry, size and nanowires/nanorods abundance were established. The mechanism leading to the VLS growth of 1D ZnO nanostructures and the transition from nanorods to nanowires have been interpreted. The formation of ZnO crystals exhibiting a hexagonal crystal structure was confirmed by X-ray diffraction (XRD) and ZnO composition was identified using transmission electron microscopy (TEM) mapping. The chemical sensing characteristics showed that 1D ZnO has good and fast response, good stability and selectivity. ZnO (Au) showed the best performances towards hydrogen (H2). At the optimal working temperature of 350 °C, the measured response towards 500 ppm of H2 was 300 for ZnO NWs and 50 for ZnO NRs. Moreover, a good selectivity to hydrogen was demonstrated over CO, acetone and ethanol.

Progress on one-dimensional zinc oxide nanomaterials based photonic devices

Nanophotonics ◽  
2012 ◽  
Vol 1 (1) ◽  
pp. 99-115 ◽  
Author(s):  
Magnus Willander ◽  
Muhammad Q. Israr ◽  
Jamil R. Sadaf ◽  
Omer Nur
Keyword(s):  
Zno Nanorods ◽  
Three Dimensional ◽  
Incident Beam ◽  
Photonic Devices ◽  
Stimulated Emission ◽  
Zno Nanostructures ◽  
Time Resolved ◽  
One Dimensional ◽  
Optical Modes ◽  
Photoluminescence Studies

AbstractOne-dimensional nanostructures hold the most attractive and excellent physiochemical characteristics which exhibit the paramount influence on the fundamental and technological nanoelectronic as well as nanophotonic applications. In this review article, we present a detailed introduction to the diverse synthetic procedures which can be utilized for the fabrication of single-, planar- and three-dimensional ZnO nanostructures. More specifically, a thorough discussion regarding luminescence characteristics of the one-dimensional ZnO nanostructures is presented for ultraviolet and visible regions. We summarize the room temperature spontaneous emission and stimulated emission along with the interaction of the incident beam with material cavity to produce resonant optical modes and low-temperature time resolved photoluminescence studies. The most recent published results on the white light emitting diodes fabricated with the combination of ZnO nanotubes with p-GaN and ZnO nanorods with p-organic polymers on glass and disposable paper are discussed. Additionally, the significant results on optically and electrically pumped lasers are discussed; along with an overview on the future of ZnO nanostructures based photonic devices.

scholarly journals Investigation On Microstructure, Energy Gap, Photoluminescence and Magnetic Studies of Co and Cu in Situ Doped ZnO Nanostructures

2021 ◽  
Author(s):  
C. Prabakar ◽  
muthu kumaran ◽  
V. Raja
Keyword(s):  
Energy Gap ◽  
Room Temperature Ferromagnetism ◽  
Ultra Violet ◽  
Hexagonal Structure ◽  
Zno Nanostructures ◽  
Defect States ◽  
Magnetic Studies ◽  
Cu Substitution ◽  
Defect Sites ◽  
Doped Zno

Abstract Co (3%) doped ZnO and Co, Cu (Co = 3% and Cu = 2 to 4%) dual doped ZnO nanostructures have been prepared using chemical co-precipitation route. Structural analysis indicated that no alteration in hexagonal structure of ZnO and the absence of secondary / impurity phases were detected by Co/Cu addition into ZnO. The size reduction at Cu = 2% is due to the suppression of growth rate and the dissimilarities between Co2+/Cu2+ and Zn2+ and improved size at Cu = 4% is responsible for the more defect sites in Zn-O lattice. The constant c/a ratio (~ 1.602) signified that absence of structural modification by Co/Cu substitution. The modification in optical absorption, transmittance and energy gap of ZnO by Co/Cu addition was discussed by dopants and the stimulated defect states. The continuous widening of energy gap with Cu substitution is clarified using Burstein-Moss (BM) band filling effect through energy level diagram. The existence of Zn-O and Zn-Co/Cu-O bonding was verified by Fourier transform infra-red analysis. The elevated intensity ratio between green and ultra-violet photoluminescence (IG/IUV) at higher Cu concentrations revealed the occurrence of more defects particularly oxygen related defect states in Zn-Co-Cu-O lattice. The observed room temperature ferromagnetism (RTFM) in Co, Cu doped ZnO nanostructures is discussed based on the oxygen vacancy mediated bound magnetic polarons (BMP) and the exchange coupling among the free electrons and local spin polarized electrons.

Studies of Point Defect Formation and Self-Compensation in Indium Doped ZnO Nanorods by STM and STS

2008 ◽  
Vol 8 (12) ◽  
pp. 6598-6602 ◽  
Author(s):  
A. González-Carrazco ◽  
M. Herrera-Zaldívar ◽  
U. Pal
Keyword(s):  
Point Defect ◽  
Defect Formation ◽  
Zno Nanorods ◽  
Scanning Tunneling Spectroscopy ◽  
Scanning Tunneling ◽  
Zno Nanostructures ◽  
Tunneling Microscopy ◽  
Donor And Acceptor ◽  
Heavily Doped ◽  
Doped Zno

The effect of indium doping on the point defect formation in ZnO nanostructures is studied by scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS) techniques. While the incorporation of a donor dopant like indium should increase the n-type conductivity of ZnO nanostructures, it has been found that formation of VZn native acceptors in heavily doped ZnO nanostructures produces self-compensation effect, creating acceptor states in their band gap. Presence of both donor and acceptor states in heavily indium doped ZnO nanostructures are probed and identified. The mechanism of formation of such donor and acceptor states is discussed.

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