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+.

The study on crystal defects-involved energy transfer process of Eu3+ doped ZnO lattice

2014 ◽  
Vol 129 ◽  
pp. 65-67 ◽  
Author(s):  
Lei Yang ◽  
Zhongcheng Jiang ◽  
Jiazhang Dong ◽  
Anlian Pan ◽  
Xiujuan Zhuang
Keyword(s):  
Energy Transfer ◽  
Transfer Process ◽  
Energy Transfer Process ◽  
Crystal Defects ◽  
Doped Zno

Preparation and Structure Analysis of Noncrystalline Granular Starch

2010 ◽  
Vol 6 (4) ◽  
Author(s):  
Peiling Liu ◽  
Benshan Zhang ◽  
Qun Shen ◽  
Xiaosong Hu ◽  
Wenhao Li
Keyword(s):  
Thermal Treatment ◽  
Crystalline Structure ◽  
Chemical Method ◽  
Physical Method ◽  
Maize Starch ◽  
X Ray Diffraction ◽  
Preparation Methods ◽  
Peculiar Form ◽  
Freeze Dried ◽  
Better Than

Noncrystalline granular (NCG) starch is a peculiar form of starch. The granules have granular shape but no crystalline structure. It is a middle state between native semi-crystal structure and paste. The conception of NCG starch was presented and its preparation methods for native maize starch were explored. Cross-linking by chloroepoxy propane was adopted as the chemical method while ethanol treatment was adopted as the physical method. Cross bonds and ethanol were both able to protect starch granules from swelling while thermal treatment was able to destroy crystalline structure of the granules. The structure of granule was observed by polarization microscope and scanning electron microscopy (SEM). Change from crystalline to noncrystalline structure was confirmed by X-ray diffraction (XRD). It indicated that preparation of NCG starch with the physical method was better than chemical method. The detailed conditions were: maize starch (40%, w/w) was slurried in 50%-ethanol, underwent thermal treatment at 85°C for 2 minutes, washed with anhydrous ethanol (2000 ml), and freeze dried.

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.

Synthesis of Rare Earth Ions-Doped ZnO Nanostructures with Efficient Host−Guest Energy Transfer

2009 ◽  
Vol 113 (37) ◽  
pp. 16439-16444 ◽  
Author(s):  
Shulin Ji ◽  
Liangliang Yin ◽  
Guodong Liu ◽  
Lide Zhang ◽  
Changhui Ye
Keyword(s):  
Energy Transfer ◽  
Rare Earth ◽  
Rare Earth Ions ◽  
Zno Nanostructures ◽  
Doped Zno

Effect of Ce doping into ZnO nanostructures to enhance the phenolic sensor performance

RSC Advances ◽  
2016 ◽  
Vol 6 (63) ◽  
pp. 58236-58246 ◽  
Author(s):  
Hasan B. Balkhoyor ◽  
Mohammed M. Rahman ◽  
Abdullah M. Asiri
Keyword(s):  
Alkaline Medium ◽  
Chemical Method ◽  
Reducing Agents ◽  
Zno Nanostructures ◽  
Wet Chemical Method ◽  
Sensor Performance ◽  
Wet Chemical ◽  
Doped Zno

Various Ce-doped ZnO nanostructures (Ce/ZnO NSs) were prepared by a facile wet chemical method using reducing agents in alkaline medium.

scholarly journals Synthesis of Ni-doped ZnO nanostructures by low-temperature wet chemical method and their enhanced field emission properties

RSC Advances ◽  
2016 ◽  
Vol 6 (106) ◽  
pp. 104318-104324 ◽  
Author(s):  
Amit Kumar Rana ◽  
Prashant Bankar ◽  
Yogendra Kumar ◽  
Mahendra A. More ◽  
Dattatray J. Late ◽  
...  
Keyword(s):  
Low Temperature ◽  
Field Emission ◽  
Chemical Process ◽  
Chemical Method ◽  
Zno Nanostructures ◽  
Wet Chemical Method ◽  
Emission Properties ◽  
Field Emission Properties ◽  
Wet Chemical ◽  
Doped Zno

In this study, we report an enhancement in the field emission (FE) properties of ZnO nanostructures obtained by doping with Ni at a base pressure of ∼1 × 10−8 mbar, which were grown by a simple wet chemical process.

scholarly journals Influence of oxygen vacancies on the structural, dielectric, and magnetic properties of (Mn, Co) co-doped ZnO nanostructures

2018 ◽  
Vol 29 (12) ◽  
pp. 9785-9795 ◽  
Author(s):  
Rajwali Khan ◽  
Zulfiqar ◽  
Clodoaldo Irineu Levartoski de Araujo ◽  
Tahirzeb Khan ◽  
Muneeb-Ur-Rahman ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Oxygen Vacancies ◽  
Zno Nanostructures ◽  
Doped Zno ◽  
Co Doped

scholarly journals Enhanced Electrochromic Properties of Nanostructured WO3 Film by Combination of Chemical and Physical Methods

Coatings ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 959
Author(s):  
Xiaoni Li ◽  
Zhijie Li ◽  
Wanting He ◽  
Haolin Chen ◽  
Xiufeng Tang ◽  
...  
Keyword(s):  
Chemical Method ◽  
Thermal Evaporation ◽  
Preparation Method ◽  
Physical Method ◽  
Optical Modulation ◽  
Thermal Evaporation Method ◽  
Physical Methods ◽  
Electrochromic Properties ◽  
Modulation Rate ◽  
Work First

WO3 films are the most widely used electrochromic functional layers. It is known that WO3 films prepared by pure chemical method generally possess novel nanostructures, but the adhesion between WO3 films and substrates is weak. However, WO3 films prepared by pure physical method usually show relatively dense morphology, which limits their electrochromic properties. In order to break through these bottlenecks and further improve their electrochromic properties, this work first prepared nanostructured WO3 powder by chemical method, and then using this powder as the evaporation source, nanostructured WO3 films were fabricated by vacuum thermal evaporation method. Properties of nanostructured WO3 films were systematically compared with those of ordinary WO3 films. It turned out that the nanostructured WO3 film exhibited better cyclic stability and memory effect, and also the optical modulation rate was 14% higher than that of the ordinary WO3 film. More importantly, the nanostructured WO3 film showed better adhesion with the ITO substrates. These results demonstrate that a combination of chemical and physical methods is an effective preparation method to improve the electrochromic properties of WO3 films.

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